Relation already exists entity framework. Is there any step while upgrading that I am missing.

Relation already exists entity framework. I guess this is related to the new index features in EF 6.

Relation already exists entity framework 2 and EF Core 2. Is it possible with an framework implementation or do I need to write custom methods? Nov 16, 2023 · ERROR: relation "Studios" already exists. AttachTo. Instead you should be assigning the Address's ID to the user's address Id to make the link. 2 and Entity Framework Core 3. Shadow properties are properties that do not exist in your entity class. However, I get the following error: Npgsql. Value in the database is NULL and sizeId. I get the following exception: An object with the same key already exists in the ObjectStateManager. StackOverflow Related Questions. 3 for an MVC 5 application, using code-first (for the first time) with SQL Server 2012. The issue. This will add the entity to the context in the Unchanged state, and can now be referenced by other entities. I have a list of Products in the database. Sep 27, 2020 · I already created the table using Entity Framework in another program. 1 code first. Mar 14, 2021 · I have already figured out how to update tournament only, but my main goal is to update tournament and nested entity. Entity states and SaveChanges. Aug 12, 2016 · I want to create a database in PostgreSQL and API for my app. Entity Framework and relational databases aren't going to support the same primary key. 1. EF. ThubOutputEmails", "AttachmentName", c => c. NET 5 web template for creating the Identity Context. Mar 9, 2022 · I am using . Question'. but as soon as the first related entity is assigned, the second related entity is shown as "added" in the ObjectStateEntries. Approach is code first, but I have one column in my SQL Server table that already exists (Country), and I don't have it in the entity class. tables will list every tables you have in the schema you are in now. I try to attach to the related entites by calling: Entry(item). Now i want to add some child records. Feb 20, 2025 · The framework for AI agents. Navigations can only participate in a single relationship. Am I expecting too much from EF or does this seem like an issue? It seems that the point of the migrations is to manage cumulative updates. May 10, 2015 · ASP. Simple example: assume I have two tables, Books (identified by their ISBN) and Purchases. NET Web API, and I want to add a new entity, that has a One-to-Many relationship. I have followed the Microsoft's example for EF Core 5+. I was calling EnsureCreated in Startup. InvalidOperationException: The property or navigation 'EmployeeRole' cannot be added to the entity type 'AdoNet. ToTable("MyType"); } }. EF Core query on . Insert entity if it doesn't exist, otherwise update. 3 I'm trying to model an object tree with a required-required relationships and a required-optional relationships. Apr 2, 2022 · table already exists exception when migrate DB using Entity Framework Core and SQLite 1 Microsoft. Apply the update database command to any DbContext after creating a new Migration layer. I am attempting to create a new order that has a list of existing products. How can I update the existing row instead of getting a new row added? Thank you for the kind assistance Aug 6, 2020 · It turns out the entire solution was completely rewritten at some point and the old database was kept. Company' because a relationship already exists between 'Company. – Dec 25, 2022 · InvalidOperationException: The instance of entity type 'PlaylistSong' cannot be tracked because another instance with the same key value for {'PlaylistId', 'SongId'} is already being tracked. . By the looks of it, you might be creating your schema unconditionally, anyways, so it's reasonable to use . Every Game has FirstTeamId and SecondTeamId and the configuration clearly says that, for a Game, if the foreign key Game. Because this is my initial create I'm unsure how to proceed. Name already exists in "ItemCategories". EF keeps a snapshot of the model in the Database. NET Core 2. Sep 17, 2014 · To update an existing entity, all you need to do is set the tracking state to Modified. What have I done wrong here? Is there a procedure for Sep 6, 2016 · The problem is that you did not run Add-Migration again after you updated the database to the version before last. InvalidOperationException: Cannot create a relationship between 'Question. But in my scenario, the course table is getting new entries for the selected courses. net membership provider users table. I want to check if a special table (entity) is existing or not. May 10, 2020 · In your agreements settings table, add a primary key "id", alongside the other two columns you already have. After I create first migration, drop whole database and try to dotnet ef database update I always get an error: 42P07: relation "AspNetRoles" already exists. The ObjectStateManager cannot track multiple objects with the Feb 29, 2012 · Entity Framework: Check all relationships of an entity for foreign key use. When I Update-Database to apply the new migration, there are errors that the indexes already exist. db) should be created on the LocalFolder by default. An entity can be in one of five states as defined by the EntityState enumeration. This portion of the model looks like this: I can't seem to assign the foreign key relationship when Jul 26, 2011 · When it's a exsisting tag you need to let the framework know it's a exsisting entity. Aug 27, 2013 · An item with the same key has already been added in Entity Framework Core SQL raw. Entry( existingGroup ); // this tracks the entity as Unchanged Jun 21, 2022 · When updating a row that already exists in the database via an Excel file upload and EPPlus, a new row is being created instead of updating the data that already exists. I am using Entity Framework to access it. Nov 10, 2010 · There are three tables: products, tags and products_tags to implement a many to many relationship. Value == sizeId. AlterColumn<bool>( name: "IsActive", table: "Advertisements", nullable: false, defaultValue: true); Apr 5, 2016 · Like Stephen Muecke pointed in the comment, your database does not have the row with what you are looking for. The record in __EFMigrationsHistory table, MigrationId, did not match the name of the file in the Migrations folder of the project. 0 API, and it allows one to execute a callback method on all the entities discovered by traversing the relationships of the root entity. There is no way in the EF model, and also no standard way in a relational database, to ensure that a principal is associated with a dependent. String(nullable: true, maxLength Aug 22, 2014 · Here is the introduction, Introducing GraphDiff for Entity Framework Code First - Allowing automated updates of a graph of detached entities. NET Core 3. Earlier today, I grabbed a fresh (obfuscated) snapshot of the production database, copied it across to my workstation, and tried to run dotnet ef database update to apply the latest migrations from my current branch: Feb 10, 2021 · 42P07: relation "AspNetRoles" already exists. Oct 3, 2018 · To solve the problem, manually attach these related entities as EntityState. DROP TABLE IF EXISTS csd_relationship; DROP SEQUENCE IF EXISTS csd_relationship_csd_relationship_id_seq; Jul 22, 2016 · But now it throws: System. Those are not the same. Foreach() loop . --FOLLOWUP--Ok. AttachRange method. The models are as follows: Jan 10, 2012 · Unfortunately, there's no equivalent in CREATE SEQUENCE to the IF NOT EXISTS construct available in CREATE TABLE. SizeId. Note that postgres table names are not case sensitive, so a table "Articles" and a table "articles" will clash. I tried running update-database, there are no changes. Nov 10, 2014 · I'm using Entity Framework and would like to insert an object into the database that references another object that doesn't exist in the DB yet (but the foreign key is known already). You switched accounts on another tab or window. Consider following example (simplified for clarity): Database table is defined as follows: CREATE TABLE [dbo]. ChangeTracker. 1. customer) I get an error: Aug 22, 2014 · Here is the introduction, Introducing GraphDiff for Entity Framework Code First - Allowing automated updates of a graph of detached entities. Postgres folds all non-doubled quoted ("") identifiers to lower case (as opposed to the SQL Standard of folding them to uppercase) but keeps the exact case when identifiers are double quoted. public class Architect : IEntity { public Guid Id { Entity Framework Add and Attach and Entity States. Regarding your address, if it already exists, then you should not be creating a new address object against the user. UpdateGraph(entity); Insert entity if it doesn't exist, otherwise update AND insert child object if it doesn't exist, otherwise update. For IEnumerable, using Any() method is the fastest way to check if the object exists in the database. Oct 12, 2020 · So for some reason, the content-types don't get deleted from the memory of existing user roles **Steps to reproduce the problem** 1) create content-type 2) add a string field to it 3) save 4) delete content-type 5) content-type is not in the list of content-types anymore but the database table still exists + the reference to the content-type Dec 31, 2012 · No INSERT for service happens but the serviceItem1/2 will be INSERTed together with the relationship entries. My Join table is getting created and I can add entries to all three Dec 15, 2017 · You stated that the entity already exists. NET & Entity Framework 1 . 2. After doing some research, I discovered the new DbContext. Jun 27, 2024 · Steps Taken: Removed the faulty migration using dotnet ef migrations remove. well I changed the order of the code so that the related entities were attached to the context before being assigned to the User entity. Apr 15, 2014 · I have some Parent records already inserted in the database. Is that possible? – Apr 12, 2019 · I'm new to Entity Framework and am trying to set up code to initialize an SQL Server LocalDB database, if it doesn't already exist. Feb 26, 2022 · As a result, the update-database command fails on that second and subsequent attempts, complaining that the tables already exist. migrationBuilder. This is the Question. I have a class that contains another Let's call them Subject and Classroom. This snapshot is updated when you run Add-Migration. FirstOrDefaultAsync(b => b. According to the EF6 docs: If you have an entity that you know already exists in the database but to which changes may have been made then you can tell the context to attach the entity and set its state to Modified. I want to post a new movie using a Dto called MovieUpdateDto. Best way to check if object exists in Entity Framework? Answer. Verified the entity model reflects the correct schema. Employee' because a property or navigation with the same name already exists on entity type 'AdoNet. I've created Model and API in EF Core 1. [Product] ( [Id] INT May 23, 2021 · If i switch to master branch where I am still using the old, I don't face such issues. Now I want to add Identity to the project, I wanna add a migration so I did: add-migration Identity How to check if an object exists in the database? What is the best way performance wise to check if the object exists in the database. NET 3. Entities. Database. Employee'. These states are: Added: the entity is being tracked by the context but does not yet exist in the database Jan 2, 2017 · It tries to insert an entity which already has its PK set to a positive value. Serial); var existingPins = existingRecords. Should it at that point? (Or only when you Update-Database does it get added?) Mar 29, 2023 · Information on saving graphs of related entities and managing relationships in Entity Framework Core What is the best way to check if an object exists in the database from a performance point of view? I'm using Entity Framework 1. public class Subject { public Classroom Class {get; set;} } May 23, 2011 · I'm using the Entity Framework with Code First approach. Is there any step while upgrading that I am missing. May 23, 2011 · I'm using the Entity Framework with Code First approach. Select(g => g. Edit, I have noticed that when I do Add my migration, its not appearing within my EFMigrationsHistory table. PostId); //id of the post that you want to update Aug 27, 2013 · An item with the same key has already been added in Entity Framework Core SQL raw. It only has May 31, 2021 · After fixing the errors in your SQL script (sequence does not exist, duplicate primary key definition), I could not reproduce the problem and got NOTICE: relation "tablename_20210530" already exists, skipping. 8 with SQL Server 2016. Migrate() method by conditionally calling it. Update: Same as Attach, but entities are marked as modified. PostgresException (0x80004005): 42P01: relation "XX" does not exist Mar 31, 2012 · Using EF code first 4. And please make sure you have set the identity column on the primary key. If I try to change the Attach call to an Add call (object with same key already exists objectstatemanager) I get: Cannot insert duplicate key in object 'database. Sqlite (2. g. SaveChanges() only once, after the . But, one thing missing with __EFMigrationsHistory table, there should be a column 'Model' to store binary data of migration. Where(v => v. Customer where RecActive = 1 and Code = 'xxx'; If query result is empty, it means customer by code 'xxx' does not exist yet. coupons. How to check if a value already exists in my database and show a validation message in ASP. Apr 13, 2009 · It is possible to mock a "well-known" entity, without hitting the database. Versions. Nov 17, 2021 · PM> Add-Migration Northwind1. Aug 30, 2022 · It didn't really generate it, I'm going to take the long way around and try to move the whole context to a new project, for me it's not funny to program the same thing twice, but I'll still apply your example to solve the problems while I'm at it, thank you very much for your help, I hope it works for me, if so I will mark the answer as correct. 1 - Entity Framework: Check for duplicates before adding to DB Sep 30, 2020 · I am using Entity Framework Core 3. ChangeLog == null); Feb 18, 2022 · 42701: column "PostalCode" of relation "City" already exists Because PostalCode was added manually to the City table in the database. Aug 29, 2010 · I have an entity with a foreign key relationship to an asp. Even with this error, the database and tables are created but it makes migrations useless as it does not save applied migrations so I can't update DB with following changes Jul 4, 2020 · Why does Entity Framework add a related record even if it already exists in the database? It should just update the junction table in this case)? I am working with Entity Framework 6, I have a many-to-many relationship between Directors and Movies. Even with this error, the database and tables are created but it makes migrations useless as it does not save applied migrations so I can't update DB with following changes 6 days ago · How to fix the Database already Exists (or Table, or Relation) error that might occur when using Database. PostgresException: '42P01: relation "tablename" does not exist' I tried putting public before my tablename, and the database name before my tablename. Do you want generic way to check if entity was loaded by context or generic way to query database if entity exists? For the former case use: public bool Exists<T>(T entity) where T: class { return this. The other SO questions concerning this issue typically had the person delete their db and do an initial migration to fix this issue. Reload to refresh your session. Id add this Game reference to the property Game. Only once you do ctx. Sample Code. If you created another property on the user like. The following is sample code for my method to insert a new User (which has no parent table references): Jan 4, 2021 · If you want the bulk addition of the rows to go as fast as possible with entity framework, (which may still be slower than your requirements, but this is yet to be seen,) then you have to make sure that your id column is auto-generated by entity framework, and refrain from specifying the value of the id in each bulk-inserted row. Sep 30, 2017 · There is already an object named 'Customers' in the database. Tags). FirstTeamId=Team. public class Template { public int TemplateID { get; set; } public string Name { get; set; } public List<TimePeriod> TimePeriods { get; set; } public List<Station> Stations { get; set; } } public class Station { public int StationID { get Nov 22, 2018 · If I create the database with the tables it creates perfectly however if the table already exists and I try to update with a new field or with the removal of the field Update-Database error, saying that the table already exists (in case it checks the first table that it tries to create if it already exists). Oct 12, 2020 · So for some reason, the content-types don't get deleted from the memory of existing user roles **Steps to reproduce the problem** 1) create content-type 2) add a string field to it 3) save 4) delete content-type 5) content-type is not in the list of content-types anymore but the database table still exists + the reference to the content-type Aug 30, 2022 · Hey Guys. NET core website 2. Entity framework wouldn't know which relationship to assign the property. Oct 29, 2020 · Update-Database command is not working in ASP. Otherwise a new record should be added. You can learn more about relationships in EF Core from the documentation Jul 18, 2014 · If you load the entity from the context you cannot attach an entity with the same key again. Nov 19, 2021 · Hi! Steps to reproduce. When attaching existing entities, ensure that only one entity instance with a given key value is attached. The value and state of these properties is maintained purely in the Change Tracker. 2 Postgresql database with multiple schemas and one of the schema already has __EFMigrationsHistory table when trying Add-Migration x1 -Context YodaCo After I create first migration, drop whole database and try to dotnet ef database update I always get an error: 42P07: relation "AspNetRoles" already exists. Dec 2, 2020 · I'm pulling data from an external API and storing this in my SQL Server database using Entity Framework Core. If it exists, then you need to perform an update or nothing at all. public int? OwnedOrganizationID { get; set; } public virtual OrgList OwnedOrg { get; set; } Mar 13, 2017 · @Gert Arnold said, Your SQLite database file (Vocabulary. Attach: Attaches every reachable entity, except where a reachable entity has a store-generated key and no key value is assigned; these will be marked as added. db. Any ideas on how to fix this? I've tried removing the migration and adding it again. To do that, I'm using the DbContext. Jan 31, 2024 · However, a principal entity can always exist without any dependent entity. Load 7 more related questions Show fewer related why do fictitious forces exist? Nov 23, 2011 · Entity Framework: check if object exists and check if it has an associated object 2 Entity Framework T4 templates, how to find out if a relationship is a proper 1 to many I am trying to update an entity with a FK relationship in EntityFramework 4. My question is, how would you implement this with the Entity Framework (LINQ to SQL): "Insert only a new tag in the tags table if it doesnt already exist there". Set<T>(). Model exists in separate library. Entry method. Jul 12, 2017 · When i create Student entity from view , the user selects the course from Course table and sends it to entity framework and EF should make entry to only Student and StudentCourse table . The only problem you have to deal with when working with detached entities is if related entity already exists in database and you only want to create new relation. Variants' and 'Variant. Could somebody please tell me how I check to see if a record exists, if it does exists then do nothing and if it doesn't then add the record to the database? Please see my code below: When a new Item is added, check if its Category. If you need to query the agreement table in the future, you can do so with any column values and just "ignore" the new primary key you added. My question, why does it generate such SQL? entity-framework-core; entity-framework-migrations; or ask your own question. Jun 3, 2023 · Identify the Serial and Pin values that already exist in the database: var existingSerials = existingRecords. You can use the following code to check if there are any pending migrations and if there are any then execute the MigrateAsync() method: The reason was pretty simple. public class MyContext : DbContext { public DbQuery<MyType> MyTypes { get; set; } protected override void OnModelCreating(ModelBuilder modelBuilder) { //Exception is thrown here //needed b/c table is not named MyTypes modelBuilder. Npgsql. Check if list of entities already exist in Database using linq to entities. 0 (ASP. 1? A bit strange, but OK. Assuming you are structuring your database around your code, you will want to manage relationships with your models and/or using FluentAPI. Thanks to this, I have May 27, 2022 · You created table "Department" but then used table Department. To do this I followed following steps: Retrieve the Parent(A) records Create a new child(B) recor Aug 18, 2024 · I have a Postgres database and tables in the public schema. Aug 24, 2016 · Ohh, and if you want to just check if the related changelog entity exists or not, and not retrieve it, you can use these: var versionsWithChangeLog = context. Nov 17, 2020 · Setup Asp. Fe Apr 29, 2017 · Use Alter column instead AddColumn in up() function. Remove: Same as Attach, and then mark the root as deleted. You should double check your migrations - it's possible that for some reason Jan 28, 2021 · I am very new to Entity Framework Core (Entity Framework in General), and I have watched several tutorial videos and done a Pluralsight course. I am using ASP. If it does set the "CategoryID" to its ID. 0. Load 7 more related questions Show fewer related why do fictitious forces exist? I am trying to update an entity with a FK relationship in EntityFramework 4. The update database command is trying to recreate the tables already created in the first migration run. 1 - Entity Framework: Check for duplicates before adding to DB May 23, 2021 · If i switch to master branch where I am still using the old, I don't face such issues. As I have provided sample of database, there are 3 tables, although I have 2 models, and I would like to keep it that way hoping for entity framework to manage 3rd table. Include(b => b. Nov 17, 2019 · In case of EfCore - [ForeignKey("{your_key_id_ref}")] works fine, but by some reason if you see this field in DB, but not in model (your parent Object was created instead) - you need to re-create constraint (and add the same key field to your model +attribute to parent obj) by adding new db migration or re-create db/table from zero if it acceptable for you. Company'. EF Core check if object in related table exists, if not - add it. Jul 1, 2018 · One obvious improvement for approach (B) would be to call the . Looking in the database and at previous migrations, almost all the indexes do indeed already exist. Value will still return true in case row. Ideally I would write plain sql query like this: select id from dbo. Even with this error, the database and tables are created but it makes migrations useless as it does not save applied migrations so I can’t update DB with following changes… Jul 1, 2015 · However this question is for c# entity framework, so your answer isn't helpful. cs model class: [Table(&quot;question&quot;)] Mar 31, 2012 · Using EF code first 4. Posts. EnsureCreatedAsync() method, which according to the documentation, will set up the database if it doesn't already exist, or do nothing if the database already exists. Build reliable and accurate AI agents in code, capable of running and persisting month-lasting processes in the background. NET Core webapi How to check if a value already exists in my database and show a validation message in ASP. customer) I get an error: Feb 10, 2016 · I try to run an Entity Framework migration: public override void Up() { AlterColumn("dbo. Also, The XX table exists. AddObject, it adds it to EF's internal "graph" (memory) in a pending state of "Added". PostgresException (0x80004005): 42P01: relation "XX" does not exist SELECT * FROM information_schema. If it does not - add a new record to "ItemCategories" and set "CategoryID" to its ID. Employees' and 'Employee. Net Core / Entity Framework Core because object in database already exists After I create first migration, drop whole database and try to dotnet ef database update I always get an error: 42P07: relation "AspNetRoles" already exists. Using all the default stuff that comes with the ASP. Pin); Feb 1, 2022 · I’m working on a project that uses Entity Framework Core, and I’m using EF Core Migrations to manage database state. The ObjectStateManager cannot track multiple objects with the same key. Create a new entity object, set the properties of the entity that are used in the entity key, and call ObjectContext. And in result i am getting the same error: An object with the same key already exists in the ObjectStateManager. So, then I changed it to the following order: May 3, 2019 · Even though OP edited the post and pretty much solved the issue with my help, I'll post an actual answer so others running into the same "issue" can benefit. Jul 25, 2019 · The entity type 'MyType' cannot be added to the model because a query type with the same name already exists. 5 SP1). Track() method of the EF Core 1. AttachRange( existingGroups ); Or per entity you can also attach via the DbContext. I'd like to be able to insert purchases, even if the book hasn't been Jun 28, 2018 · I have a table called Pages in my database already since it comes from the DbInitializer class. already exists Oct 4, 2021 · I'm unsure how to use EF Core to insert a new entity that has existing children. Nov 26, 2015 · It's quite self-explainatory. Nov 18, 2018 · Add: Adds every reachable entity that isn’t already tracked. Question', because there already is a relationship between 'Question. Generated a new migration using dotnet ef migrations add AddColumnsToPortfolio. public string Country { get; set; } Now, when I try to save this table (e. May 12, 2014 · Using Web API 2 and EF 6. You signed out in another tab or window. The framework is trying to insert the entity again. Local. Currently this can be done the same way many-to-many relationships are done, via linking objects/tables. I can't do an add-migration and then remove the Up / Down entries because the plugins aren't within the same project. So I end up with duplicates in course table. I am trying to read a list of products from the db using entity framework core. Table'. It only has Oct 17, 2012 · At the moment I have something like this, to check if an Entity has already been added (simplified): WinEveryBetBYeMiContext context = new WinEveryBetBYeMiContext(); string firstPlayerName = "R. Value is concrete value (not null). Also, if I am not mistaken row. service already exists and should NOT be INSERTed, all serviceItems already exist and should NOT be INSERTed, but the relationships between the entities should be INSERTed into the join table: Nov 20, 2015 · The issue I now face is that because the tables already exist in the database, I can't update-database because it says PluginTable already exists in the database. For example: You signed in with another tab or window. Unchanged. 3 Build started Build succeeded. May 25, 2022 · Check if an entry already exists in Entity Framework. NET 5 project, Entity Framework 7. Telling someone not to do something which already solves a problem without giving an alternative solution is pointless. Entity<MyType>() . That is, a required relationship does not indicate that there will always be a dependent entity. The table name is question. Manager' and 'Employee. I pull data from this API every day so I want to check for rows that already exist by Id, in case the Id already exists in the database, then the row should be updated. EntityFrameworkCore. – Hello, I changed some column names added many-to-many relationship to 2 business models then ran the Add-Migration and Update-Database commands but it says AspNetRoles already exist, I wanna run only the last migrations I did, not the create user tables stuff, is my logic wrong? Apr 24, 2015 · I am using Entity Framework 6. 3 Code First. I am trying to add a new Template (see model) which has relationships to already existing TimePeriods and Stations. You'll need a UserToRole linking entity for this relationship and similarly a WhateverToRole entity for each of the other objects you use lists of roles for. What have I done wrong here? Is there a procedure for Jul 12, 2017 · When i create Student entity from view , the user selects the course from Course table and sends it to entity framework and EF should make entry to only Student and StudentCourse table . 0. Thankfully EF Core owners made it clear for me on GitHub. Jul 11, 2011 · But when the subscription with the same key appeared in the foreach loop the extension method IsAttachedTo returning false every time, it is does not detect that there is already such entity attached. PostId == Post. Works on local environment but fails in production on heroku. cs which was getting conflict with migrations as working different way. Jan 29, 2018 · I need to check if customer by code already exists in the database using entity framework. Edit: I took another gander at your post, and it seems like you are expecting relationships to be established when adding the data. FirstTeam and the same for the SecondTeam (in this case can be Feb 1, 2022 · That username/password is still a valid server login on localhost (and, hey, look at that super-secret password right there!), but there’s no corresponding user in the my-database database, so I’m guessing what happens here is EF Core connects to the server (which works), tries to open the database, can’t open it, and so assumes it doesn Sep 8, 2017 · You're trying to create the owner relationship with the same property on the user that you are using for the employee relationship. Navigation properties can only participate in a single relationship. or you could encapsulate this whole functionality into a stored procedure in the database and just make that one stored procedure call to update all relevant products - in one database call, instead of loading all n products just to set a single value on them . State = EntityState. Sep 13, 2022 · However, at runtime, EF Core rejects this configuration with the message "Cannot create a relationship between 'Company. Jul 6, 2019 · Everything is working well as like EF 6. The first entity is still kept in internal context cache and context can hold only one instance with given key value per type (it is called identity map and I described it here in other situation). As an example, you can use the DbContext. Either you are doing something different, or you are connected to the wrong database or something like that, or that is not normal You can try: var original = await _context. So I have added a plain string property. ChangeLog != null); var versionsWithoutChangeLog = context. my db is in postgres It happens when i try to &quot;Include&quot; the products images … Jan 16, 2011 · When you do . Nov 26, 2010 · So at this point, I have the Entity Framework has already been used to create my various classes for the ORM, and I am looking to create data services for the CRUD operations on my entities. Not only PostalCode, there are other manually added fields. The base class DbContext has functions to create and delete the database as well as to check for its existence. – Oct 25, 2023 · sqlite: table already exists exception when migrate DB using Entity Framework Core and SQLiteThanks for taking the time to learn more. System. Apr 4, 2021 · This means that you are probably trying to recreate a database table that already exists. Jun 3, 2017 · Update: Actually there is another cleaner way, since even if the entity has no navigation or FK property, EF Core allows you to access/modify the so called Shadow Properties. Jul 19, 2022 · I have been struggling to get a many-to-many relationship up and running. Any(e => e == entity); } For the latter case use (it will check loaded entities as well): Mar 22, 2011 · A detached entity is not tracked by context but once you call Attach or Add on the set to attach this entity all related entities will be attached / added as well. 0 for migration, creating tables, relationships, etc. Aug 4, 2022 · The reason for you are getting the exception is because the table AspNetRoles already exists in the database. When I start up the app and first try to hit the c Jun 13, 2017 · An object with the same key already exists in the ObjectStateManager. The Database does not exist before hand, it is all being created from scratch b Nov 19, 2017 · This definitely solved the issue but as a follow-up, the "Create if not exists" started throwing other duplicate/unique value errors further down in the script (I've heard of PostgreSQL getting out of sync, not sure if this was the case). CorrectVariant' and 'Variant. Dec 10, 2019 · Perhaps I am missing something, but I don't agree with the idea that EF couldn't know if a Team is First or Second when adding to Team. 0 peview1-final) migration is not creating tables Nov 20, 2015 · The issue I now face is that because the tables already exist in the database, I can't update-database because it says PluginTable already exists in the database. You should be able to find the database with Tag table is already created on C:\Users\{username}\AppData\Local\Packages\{your app package name}\LocalState). I guess this is related to the new index features in EF 6. Games. SaveChanges() will the changes be persisted to the underlying store. In this video I'll go Mar 9, 2022 · I am using . gifqh csqebukn jihn avos vzqobzy axhri ona chft bnidox mhyl lrwf mnopq wrylnv pivbf dzxb