Foreign Key Error Entity Framework
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Entity Framework Code First Foreign Key
and policies of this site About Us Learn more about Stack Overflow the insert statement conflicted with the foreign key constraint entity framework the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation entity framework foreign key mapping Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it
Entity Framework Fluent Api Foreign Key
only takes a minute: Sign up Entity Framework Code First Foreign Key issue up vote 4 down vote favorite 1 It seems to me like the ForeignKey attribute is not working for me, but I guess I'm using it wrong ;) It's easier to explain with code: public class BaseCard { public int Id {get ; set; } public int BaseCardId
Entity Framework Foreign Key Attribute
{ get; set; } public List
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Foreign key Error Entity framework up vote 1 down vote favorite The operation failed: The relationship could not be changed because one or more of the foreign-key properties is http://stackoverflow.com/questions/27666857/entity-framework-code-first-foreign-key-issue non-nullable. When a change is made to a relationship, the related foreign-key property is set to a null value. If the foreign-key does not support null values, a new relationship must be defined, the foreign-key property must be assigned another non-null value, or the unrelated object must be deleted. This generic error is annoying, how do i find out WHICH foreign key failed. entity-framework share|improve this question asked Feb 24 at 0:38 Aflred 2903714 add a comment| 1 https://stackoverflow.com/questions/35591130/foreign-key-error-entity-framework Answer 1 active oldest votes up vote 0 down vote As of I understood your problem,The actual error is the foreign key column in the table is not accepting null and the entry is not providing data for that column. If you have used fluent api , one option is you can change IsRequired() to IsOptional() for foreign key mapping share|improve this answer answered Feb 24 at 5:29 Nithila Shanmugananthan 164110 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a guest Name Email Post as a guest Name Email discard By posting your answer, you agree to the privacy policy and terms of service. Not the answer you're looking for? Browse other questions tagged entity-framework or ask your own question. asked 7 months ago viewed 44 times active 7 months ago Related 97The relationship could not be changed because one or more of the foreign-key properties is non-nullable5The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable19EF6.0 “The relationship could not be changed because one or more of the foreign-key properties is non-nullable”6Entity Framework DbContext .Remove(obj) vs .Entry(obj).State = EntityState.Deleted1Entity Framework foreign key InvalidOperationException0Can't remove entity with a foreign key relationship in entity framework asp.net mvc0Intermittent issue with nullabl
16, 200943 0 0 0 Background A number of months ago we asked whether Foreign Keys (FKs) in Conceptual and Object models were important. The feedback we got indicated that there are a real mix of opinions on https://blogs.msdn.microsoft.com/efdesign/2009/03/16/foreign-keys-in-the-entity-framework/ the topic. Some people are all for them while others think that FKs pollute the conceptual model. The fact that our customers were so divided meant we thought it was important to provide options here. Those who want FKs in their Entities should be able to do so, so they can gain all the benefits that having FKs in your Entities undoubtedly provide. foreign key On the other hand customers who are concerned that have FKs in their Entities in someway pollutes their model can continue to use the type of associations we had in .NET 3.5 SP1. In the past we've called the .NET 3.5 SP1 style Associations "first class" associations. Which while accurate somehow implies that associations based on FKs in Entities are "second class". entity framework foreign In fact when we talked about this new work recently with our MVPs one of the first questions was "are these second class?", which they most definitely are not. The fact is these new associations are different but first class nevertheless. So what's been added? In .NET 4.0 we will add support for a new type of association called "FK Associations". The way this works is we will allow you to include your FK columns in your entities as "FK properties", and once you have FK Properties in your entity you can create an "FK Association" that is dependent upon those properties. Okay so we will have "FK Associations", what are we going to call the older style associations? Obviously saying something like ".NET 3.5 SP1 style Associations" every time isn't ideal. So we are going to call them "Independent Associations". The term "Independent Association" resonates for us because they are independently mapped, whereas FK Associations need no mapping, simply mapping the Entity(Set) is sufficient. How do I use an "FK Association"? The real reason so many customers and partners are asking for "FK Associations" is