Error relation already exists entity framework example. Countries) { newRevisionRec.

Error relation already exists entity framework example Migrate(); from the program. The ObjectStateManager cannot track multiple objects with the same key. The framework is trying to insert the entity again. Apr 30, 2019 · Entity Framework DbContext is trying to insert data, that already exists. It creates a System. Add(entity); Code to attach an entity (Update) context. 4 to 7. 1 day ago · How to fix the Database already Exists (or Table, or Relation) error that might occur when using Database. Id add this Game reference to the property Game. newRevisionRec. var unchangedItems = ((IObjectContextAdapter)dbContext). ToTable("MyType"); } } Note. SaveChanges(); } } Jul 26, 2011 · When it's a exsisting tag you need to let the framework know it's a exsisting entity. Every Game has FirstTeamId and SecondTeamId and the configuration clearly says that, for a Game, if the foreign key Game. 3 I'm trying to model an object tree with a required-required relationships and a required-optional relationships. FirstOrDefault(v => v. Exists() It works for EF 7. As the name suggests, it will create the database if none exists as per the configuration. Instead, you need to load the existing record from the dbcontext and map the properties from the data passed into the API to the existing record. Provide details and share your research! But avoid …. Countries) { newRevisionRec. Ask Question Asked example i'm fetching every minute 10. Database. I would like to be able to remove Contours whether or not they already exist in the database. First finding the record, if it exists, update. SaveChanges() will the changes be persisted to the underlying store. Nov 17, 2020 · Setup Asp. Oct 29, 2020 · Update-Database command is not working in ASP. This way you would not have to bring the entity to the client to create the relationship (you need to know the key of the related entity though). Your code is attaching if it can't find an entity when it should really be adding. util. Example. Variants' and 'Variant. Regarding your address, if it already exists, then you should not be creating a new address object against the user. 2. A required relationship ensures that every dependent entity must be associated with some principal entity. Jan 15, 2018 · I use Entity Framework Core 2. Either the table is not created or the generated SQL statement is missing something. Not sure why you're turning off change tracking; that's what makes all this work. to get the references for IObjectContextAdapter). CategoryID' on the other end. GetService<IDatabaseCreator>() as RelationalDatabaseCreator). Users' and 'AppUser. 2 MVC App, with added scaffolded Identity as the authentication (I have all the ASPNetUsers/ASPNetRoles tables etc). GameBanks . NET 5 project, Entity Framework 7. add your PostalCode to the model then add the migration and update: Jul 11, 2011 · Now to your real problem. Nov 29, 2016 · In Entity framework code first approch, there are four different database initialization strategies: CreateDatabaseIfNotExists: This is default initializer. Versions. Here is my code: var book = new Model. ObjectStateManager. An example of this would be to have something like an Order and OrderDetails which contains additional details about a specific order. Add-Migration InitialCreate –IgnoreChanges Then add your changes to the models i. InvalidOperationException: Cannot create a relationship between 'Question. I might do May 9, 2019 · I have a SQL Server database as the web service backend and a local SQLite database at the mobile frontend. InvalidOperationException: The instance of entity type 'Household' cannot be tracked because another instance with the key value '{Id: 1}' is already being tracked. Repository example: Aug 31, 2022 · This will result in one of two things where a row for Product ID #35 already exists. Sep 21, 2016 · Also me and a frieand are working on a project and share the data using Git Hub, but for example when I do some changes in a table that already exists, (for example add new prop like: public int Count {get; set:} ), my friend don't get the new changes! Nov 16, 2013 · Both databases already exist and the Entity Framework has no part in creating or modifying structure for either. For example, if I add a new Contour to an existing Structure object like Sep 30, 2017 · I'm in the process of learning how to use EF and I'm attempting to do an initial create migration using EF core. e. Both would use "OrderId" as their PK and OrderDetails uses it's PK to relate back to its Order. Exists() Jul 12, 2017 · If I don't use iSupplierRepository below a supplier will be added, but it will always add a new one even though there already exists one with that name. Apr 14, 2021 · I am using Entity Framework 6. var versionWithChangeLog = context. NET core website 2. The Database does not exist before hand, it is all being created from scratch b Jan 11, 2022 · This doesn't work. 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 Aug 27, 2013 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. What you could also try would be to use foreign keys and add parent and just set the foreign key to the related child Id. public class Startup { public Startup(IConfiguration configuration) { Configuration = configuration; } public IConfiguration Configuration { get; } // This method gets called by the runtime. Aug 22, 2018 · And this is my startup. this is how I resolved the issue. The record in __EFMigrationsHistory table, MigrationId, did not match the name of the file in the Migrations folder of the project. 0 (ASP. Modified; Aug 24, 2016 · when you query for the 'Version' entity, ensure you also request the 'ChangeLog' entity, as follows. using System. Add(new Country { CountryId = country. I created the following entity: public class UserBankAccountTransaction { public long PayerBankAccountId { get Jul 20, 2015 · Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand Jun 18, 2014 · Take a look at the ObjectStatementManager (and use ctrl + . However, a principal entity can always exist without any dependent entity. py: - Create model AddressPoint - Create model CrudPermission - Create model CrudUser - Create model LDAPGroup - Create model LogEntry - Add field ldap_groups to cruduser - Alter unique_together for crudpermission (1 constraint(s)) Sep 21, 2017 · I have used the Entity Framework Core and update some object with relation to another object. Migrate() method by conditionally calling it. Jul 1, 2015 · Have you tried to check if the entity exists and if not - add it? Like this : UPDATE. TABLES WHERE TABLE_SCHEMA = 'TheSchema' AND TABLE_NAME = 'TheTable')) or b) SELECT * FROM sys. AddObject, it adds it to EF's internal "graph" (memory) in a pending state of "Added". Id == versionid); this ensures that EF always tries to pull the related ChangeLog entity for the Version entity. When attaching existing entities, ensure that only one entity instance with a given key value is attached. 4. ID' on one end of a relationship do not match the property value(s) of 'Lesson. 11) application. CountryId 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). 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: Jan 16, 2011 · When you do . Mar 13, 2017 · @Gert Arnold said, Your SQLite database file (Vocabulary. Is there a way to first check if an entity exists in the context, and if it doesn't, then attach, otherwise, retrieve the already attached entity, and apply the changes from the modified entity to the attached entity, if that makes sense. CreateSequence( name: "OrderItemsHiLo", incrementBy: 10); // more code } And in my Down section in migration I have: Feb 20, 2025 · When working with Entity Framework Core, Here’s an example of how to check for pending migrations and apply them: you can effectively resolve the relation Nov 17, 2016 · Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Contains(g. BUT I CAN'T FIND THE ENTITY. Navigation properties can only participate in a single relationship. There are some limitations, such as modeling and migration. Entity detail GenericInformation keys GKey_K, GI_K fields Product_K, . I have a following entities: Client: public class Client { public int Id { get; set; } public 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. About the Author: Pranaya Rout Pranaya Rout has published more than 3,000 articles in his 11-year career. public int? OwnedOrganizationID { get; set; } public virtual OrgList OwnedOrg { get; set; } Apr 24, 2015 · I am using Entity Framework 6. 1 code first, I have the code as below, namespace ConsoleApplication5 { class Program { static void Main(string[] args) { using (var context = new Feb 26, 2022 · As a result, the update-database command fails on that second and subsequent attempts, complaining that the tables already exist. 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. I have two entity classes, Structure and Contour, where a Structure may contain multiple objects of type Contour. Jun 11, 2019 · Failed to execute: alter table sezioniastratte add constraint FK_5nekcygup70my0ixo073o215d foreign key (padre_id) references sezioni org. cs file:. CountryCollection = new Collection<Country>(); foreach (var country in record. Entity<MyType>() . Both use EF Core 2. objects WHERE object_id = OBJECT_ID(N'[dbo]. 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. I need to insert another 50 users. But it wouldn't be a big deal (see some walkaround tips). I have followed the Microsoft's example for EF Core 5+. Code to add a new entity (Create/Insert) context. Jul 19, 2013 · It can happen if you have inverse navigation properties in contractors class, like so:. Hi, I have a . PSQLException: ERROR: constraint "fk_5nekcygup70my0ixo073o215d" for relation "sezioniastratte" already exists Jul 29, 2010 · I've 2 entities without any relationship (VS does not load the join and I can't manually add it because the primary key of the child uses a derivated key of its parent). 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. Here's the list of things I've tried: changing the Get() query to . " for example: Mar 3, 2013 · I'm using EF4. CorrectVariant' and 'Variant. Question', because there already is a relationship between 'Question. The method you have referenced from the related question will not work in your case. Just a note, that I've also ran a similar command before for another table: Mar 21, 2022 · Please just change @Column and @Entity's attribute of value to @Column("column")and @Entity("P_CC_CASE") Table name is "P_CC_CASE" with double quota. ITEMS. NET, LINQ, SQL Server, MYSQL, Oracle, ASP. 11 I get the error: Npgsql. NET Web API, EF, EF Core, ADO. I think it will work only if you load the subscription from the database. Set the SubReport entity's Report to the new Report entity created in 1. But I have new error: 42P07: relation "OrderItemsHiLo" already exist. 1 and the goal is to insert some many-to-many related objects in the DB by an auxiliar entity. 2 and EF Core 2. CountryCollection. The examples of this I've seen always use an instance of the class rather than an Id property. This was because the foreign key column name wasn't specified and the Entity Framework searched for a default column, which is in fact Sender_PK. Given an ID provided by the page, look up the ReportSource and set the Sub_Report entity's ReportSource to the found entity Jan 29, 2021 · This will trip up because you are using EntityA's PK as the FK to Entity B, which enforces a 1 to 1 direct relation. Pranaya Rout has very good experience with Microsoft Technologies, Including C#, VB, ASP. Oct 3, 2018 · Editing my answer with the correct solution we came to in comments: The issue lies with the two different DbContexts in the code: public static void InsertingItem(){ Item example = new Item(){ // DbContext #1 is created in this method GROUPS = AlreadyExistingGroup(); } // And this is DbContext #2 using (myDbContext db = new myDbContext()){ db. Sep 29, 2014 · In the code below you're creating a new Country object, which will be considered a duplicate by Entity, since it's the one managing the relationship. tables will list every tables you have in the schema you are in now. 4 with TpH approach and share the majority of C# classes, but - of Dec 4, 2012 · The first time I call Update method, run sucessfully, but the second time I get this error: "An object with the same key already exists in the ObjectStateManager. Apr 8, 2019 · Entity Framework DbContext is trying to insert data, that already exists 0 Error: Table 'Table_name' already exists after Update-Database command Feb 20, 2022 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Include(v => v. Serial) && pins. FirstTeam and the same for the SecondTeam (in this case can be Sep 23, 2020 · Remove the relationship setup from the OnModelCreating; The previous step caused that "sql logic error" posted in the question. Oct 22, 2015 · I try to add new model to DB but the model have child that already exists and i got this error: "A referential integrity constraint violation occurred: The property value(s) of 'Category. NET MVC. State = EntityState. Cannot insert duplicate key in object 'dbo. Pin)) . 2 Postgresql database with multiple schemas and one of the schema already has __EFMigrationsHistory table when trying Add-Migration x1 -Context YodaCo Dec 15, 2017 · You stated that the entity already exists. 0-rc1-final version for SqlServer. This article is about what I have got. BookNumber, BookName = _book. Mar 28, 2014 · 2) I use some of the suggestions I've seen here and elsewhere on the net (e. Unchanged); var addedItems = ((IObjectContextAdapter)dbContext). Here’s a summary of what your output might resemble: Migrations for 'crud': 0001_initial. Note that postgres table names are not case sensitive, so a table "Articles" and a table "articles" will clash. I'm using the Visual Studio 2017. Department'. The stacktrace originates from the last line in UserRatingConfig. lists ( account_id ); How do I create an index on the foreign key? I am running v11. Jul 19, 2022 · I have been struggling to get a many-to-many relationship up and running. Net Core / Entity Framework Core because object in database already exists Feb 19, 2025 · The instance of entity type 'Channel' cannot be tracked because another instance with the same key value for {'ID'} is already being tracked. Entity master Products keys GKey_K, Product_K fields . . 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 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. Entity framework wouldn't know which relationship to assign the property. Here is a simple representation of those classes public cl 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. SetValues only updates scalar properties but no related entities, so you must do the same for each related entity:. Try Teams for free Explore Teams Apr 4, 2021 · Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. db) should be created on the LocalFolder by default. Error: The relationship between the two objects cannot be defined because they are attached to different ObjectContext objects. My Up section: protected override void Up(MigrationBuilder migrationBuilder) { migrationBuilder. Instead you should be assigning the Address's ID to the user's address Id to make the link. 3. Feb 24, 2021 · Violation of PRIMARY KEY constraint 'PK_BookTag'. I am… Jun 3, 2023 · Query the database to check if any records already exist with the same Serial and Pin values: var existingRecords = await _oyunPalasContext. After that you can separate storage logic with repositories. Department' because a relationship already exists between 'Department. coupons. Manager' and 'AppUser. 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. Nov 21, 2017 · 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. – May 3, 2019 · Now it all sound logical. Either we get an exception for a Duplicate PK as EF tries to insert a product for the same ID, or it will attempt to insert a new Product with an ID of #645 or whatever happens to be the next available Product ID if that table is set up for an Identity column May 23, 2011 · How can I convert DbContext to ObjectContext? I've seend diffrent approaches to check for the existence of a table. Feb 4, 2016 · After reading Entity Framework 5 on SQLite and CodeFirst with SQLite using Entity Framework 7, I have decided to try my own code. Saving Entity causes duplicate insert into lookup data, Prevent Entity Framework to Insert Values for Navigational Properties) to solve issue 1 and then find myself fighting against this same issue: An object with the same key already exists in the ObjectStateManager. 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. When I run Update-Database after running Add-Migration InitialCreate I receive an er Mar 18, 2014 · If entity does not exist in database, you should be adding instead of attaching. If you have an existing schema then you should create a snapshot of it with. Games. SELECT * FROM "P_CC_CASE" means table name is string so it can not find it. Here is a screenshot. 5 SP1). ToListAsync(); Identify the Serial and Pin values that already exist in the database: Nov 21, 2017 · In my case similar error occurred because I already had the DB and Tables created but not using migration. Nov 18, 2016 · The simplest way is create the one DbContext that will include all sets of entities and relations between them. May 26, 2017 · When calling Add on a DBSet with a model that was not loaded from EF, it thinks it is untracked and will always assume it is new. 000 objects from the database Aug 7, 2018 · I've done this in webforms but having a hard time trying this in ASP. If you created another property on the user like. However, the point is that the scaffolding wizard is meant to actually create this file rather than you having to manually create it first. BookN Aug 6, 2020 · It turns out the entire solution was completely rewritten at some point and the old database was kept. ObjectContext. postgresql. Expressions; public class ContextWithExtensionExample { public 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 Jul 8, 2015 · For some reason, entity framework is already tracking the entity. Question'. 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. 0: (context. PostgresException: '42P07: relation "__EFMigrationsHistory" already exists' on running dbContext. Mar 1, 2023 · With this setup, when I try to run dotnet ef migrations add InitialCreate I get the following error: The property or navigation 'Movie' cannot be added to the entity type 'UserRating' because a property or navigation with the same name already exists on entity type 'UserRating'. 3 for an MVC 5 application, using code-first (for the first time) with SQL Server 2012. Oct 2, 2015 · I'm using the Entity Framework 6, database first (I'm new to EF). GetObjectStateEntries(EntityState. public partial class contractors { // public virtual ICollection<a> aCollection { get; set; } public virtual ICollection<a> aCollection1 { get; set; } } Feb 18, 2022 · EF 6. Set<T>. Net Core 2. Added); Jan 30, 2023 · Cannot create a relationship between 'Department. 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 May 15, 2015 · ERROR: relation "replays" does not exist SQL state: 42P01 I looked through the manual but did not find anything very helpful, though I suspect it may have to do with search_path somehow. Mar 8, 2012 · An object with the same key already exists in the ObjectStateManager. AsNoTracking() does nothing. NET MVC4 with Entity Framework Code First. May 10, 2015 · ASP. FirstTeamId=Team. However, I get the error: "The instance of entity type ' Aug 30, 2022 · As I answered above, I started with the API project that uses individual accounts, therefore I used the same context to create the tables with Code First, in which there are tables related to the AspUsers table, after that I started with the project Web and I thought about creating a third project for the data model, but I found myself stuck with the Identity tables, so in order not to use 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. Nov 25, 2015 · (context. And please make sure you have set the identity column on the primary key. UPDATE: Entity Framework Core 2. If it exists, leave as is, and save changes. NET 3. My Join table is getting created and I can add entries to all three While using npg package as your data store ORM you are expecting the ORM framework (Entity Framework in our case) to generate the sql statement you might face a PostgreSQL exception the relation 'Table Name' does not exist. Add(example); db. ChangeLog) . Jan 24, 2013 · In your case you want to add the Parent entity and then attach the child entity. Linq. BookTag'-- Kinda says it all. When I start up the app and first try to hit the c CurrentValues. You can use the following code to check if there are any pending migrations and if there are any then execute the MigrateAsync() method: Dec 31, 2012 · No INSERT for service happens but the serviceItem1/2 will be INSERTed together with the relationship entries. Sep 17, 2014 · I am trying to update a record using EF6. NET MVC, ASP. If it exists, then you need to perform an update or nothing at all. Attach(entity); context. If it doesn't exist, create it, and save changes. You need to write P_CC_CASE at @Entity annotation. Because you are going to delete your current entity you should simply clear all its navigation properties before you change its state to deleted. Aug 4, 2022 · The reason for you are getting the exception is because the table AspNetRoles already exists in the database. I created a sample database on the migration server and restored it to my local computer sql server (entirely in t_sql, no EF) and my context and its data classes are working fine and returning the data I want. public Foo Edit(Foo newFoo) { var Mar 31, 2012 · Using EF code first 4. Book { BookNumber = _book. Where(g => serials. Jul 25, 2019 · The entity type 'MyType' cannot be added to the model because a query type with the same name already exists. Only once you do ctx. Do you mean that I need to include an int CountryId property in the UserProfile class and let EF work it out? – Nov 23, 2024 · You should expect to see a series of migrations created. [TableName]') AND type in (N'U')? Oct 12, 2012 · The Country entity is in the DbContext already. I'm trying to create an Entity, and if the entity already exists with the id number, I Dec 17, 2015 · Manually adding this class to the Model folder as Jan suggests seemed to work for me. x with Npgsql and code first approach. After updating from 7. Navigations can only participate in a single relationship. entity-framework Jan 16, 2013 · In such case you must ensure that no entity in the object graph already exists in the context. This table may have 200,000+ entries. NET Core, Cloud Computing, Microservices, Design Patterns and still learning new technologies. – Apr 25, 2014 · Property or navigation with the same name already exists on entity type - how to add foreign keys in migration scenario of Entity Framework Load 7 more related questions Show fewer related questions Aug 8, 2013 · I'm using ASP. If you then run Add-Migration again, the DropColumn statements should no longer be generated. Asking for help, clarification, or responding to other answers. Appreciate any feedback Feb 5, 2019 · but I get this error: ERROR: relation "account_id_index" already exists When I run: CREATE INDEX account_id_index ON creator. g. 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). Entry(entity). I have a table called "users", with primary key "UserId". Oct 13, 2016 · Set the properties for a new Report entity from the page's fields. Set the SubReport entity's specific properties from the page's fields. NET 5 web template for creating the Identity Context. Oct 31, 2022 · todoItem comes from the body of the POST request, TodoItem has a One-To-Many relationship with Users, so what I did is the same as the Entity Framework documentation – Daniel Commented Oct 31, 2022 at 21:51 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. " What I forget to close? This is the correct way to update many to many relations in EF5? Thanks in advance Jul 22, 2016 · But now it throws: System. SELECT * FROM information_schema. Sep 6, 2016 · For example, you can just remove the DropColumn statements in the migration you have already created, then Update-Database. 0. 1. cs in an winforms (core 7. Is there any difference between your solutin an a) SELECT * FROM INFORMATION_SCHEMA. Add new migration; Manually insert the newly added migration into migration history table (__EFMigrationsHistory) Jun 11, 2014 · If you need to do something like this using EF, you need to check if the relation exists in the DB by loading the related entity. izch nitlmu blqmwr cimbbeu xxu szezmv fdq kddy lwgatlc zskcv vnndq gsc oixhy mhu qrtuh