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Entity Framework Cascade Delete Not Working


entity-framework code-first share|improve this question asked Jul 9 '12 at 14:08 jaffa 9,82730129247 add a comment| 2 Answers 2 active oldest votes up vote 0 down vote accepted The cascade delete For example, the HonorsAdvisorId property of Student. ParentId { get; set; } public virtual Post Parent { get; set; } public virtual ICollection Posts { get; set; } public virtual ICollection Comments { get; set; } } public The other choice is what I actually did, use Identity Relationship. his comment is here

Summary By default, Code First makes an optional relationship when the FK is nullable and a required relationship when the FK is non-nullable. I f I want to delete a pack included in one offer I get an exception due to "restrict" constrain of the FK, so the operation fail. The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable. We’ll remove the eager loading (Include) that pulled the Lodging data into memory along with Destination.

Entity Framework Cascade Delete Code First

Mark Bouwman Did you manage to get this solution to work? To put it another way, if something is marked as deleted, then it will stay in this state until it is either successfully deleted or its state is changed to something The key point is just to configure the mapping properly. I agree that it would be very useful to make the entities/relationships available in the exception object.

In it, you'll get: The week's top questions and answers Important community announcements Questions that need answers see an example newsletter By subscribing, you agree to the privacy policy and terms Browse other questions tagged c# asp.net-mvc-3 entity-framework entity-framework-4 or ask your own question. There’s no way to do this in the entity mapping, but we can override SaveChanges in our custom DbContext class to detect orphans and then delete them: public class CustomerContext : Therefore, if a Destination is deleted, any related Lodgings (that are in memory and being change-tracked by the context) will also be deleted.

I do not understand that if the delete operation fails and triggers the exception, EF do not rollback the state of the entity and its relationships to the unchanged state, and If you have a Lodging that is being change-tracked and you delete its related Destination, this will cause Lodging.Destination to become null. In fact , is interesting for me, that the exeception takes place in order to prevent the end user to delete a pack assigned to an offer. It is Deleted also even though we did not explicitly remove any of the Lodgings.

Conversely, optional relationships are usually represented by nullable foreign keys. Should I have doubts if the organizers of a workshop ask me to sign a behavior agreement upfront? Next, the call to SaveChanges persists the deletions to the database.Figure 4-7. Cascade delete defined in a database constraintExample 4-12. A method to explore cascade deletesprivate static void DeleteDestinationInMemoryAndDbCascade() { int destinationId; using (var context share|improve this answer edited Sep 26 '11 at 14:32 answered Sep 26 '11 at 14:24 Ian Nelson 27.7k176197 add a comment| Your Answer draft saved draft discarded Sign up or

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  • share|improve this answer answered Oct 11 '14 at 2:24 SaDHacK 447 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign
  • That means that I'd either had to : make my domain being aware of persistence by using "IRepository" interfaces or let the external world handle part of my deleting logic.
  • Makes a copy of this filtered list to avoid modifying a collection while enumerating it.
  • The root repositories and not even specialized, I just use a generic repository. 4/ However it is amazing efficient to add, modify (and of course retrieve) entities from Collections without having
  • I have this structure: public class Post { public long Id { get; set; } public string Body { get; set; } public long?
  • Why (and when) does pattern matching with f[__] perform MUCH more quickly than _f?

Entity Framework Cascade Delete Code First One To Many

The lifetime of the EF context is the lifetime of the wpf window in most of cases. For example if you have an Order loaded that is related to a Category via an unloaded Product, and you delete the Category,the EF won’t know to delete the Order. Entity Framework Cascade Delete Code First EmailMessageId { get; set; } public virtual EmailMessage EmailMessage { get; set; } } public class EmailMessage { public int EmailMessageId { get; set; } public string Content { get;set; } Entity Framework Cascade Delete One To Many But you may want a required relationship in your classes without leveraging cascade delete.You may want to get an error if the user of your application tries to delete a Destination

Using Convention and Configuration for Relationships Working with Multiplicity Working with Foreign Keys Working with Inverse Navigation Properties Working with Cascade Delete Exploring Many-to-Many Relationships Working with Relationships that Have Unidirectional this content However, if the property is non-nullable then EF instead conceptually sets it to null without actually doing so. Start a coup online without the government intervening Word for a non-mainstream belief accepted as fact by a sub-culture? If the relationship from Lodging to Destination is optional, this is not a problem, since by convention, Code First won’t use cascade delete with an optional relationship.

public void AddOrUpdate(T entity) { var objContext = ((IObjectContextAdapter)UnitOfWork.DbContext).ObjectContext; object originalItem = null; ObjectStateManager objectStateManager = objContext.ObjectStateManager; ObjectStateEntry stateEntry = null; bool isPresent = objectStateManager.TryGetObjectStateEntry(entity, out stateEntry); EntityKey key = isPresent Why is the 'You talking to me' speech from the movie 'Taxi Driver' so famous? I will file a bug for this. weblink There is no change in EF5.

So when the user is managing a pack, is not necessary to assign a pack to an offer. If you are _only_ setting FKs then you should not be getting this exception. In the SaveChanges method, the list that contains the orphaned entities is empty as the navigation property is not set to null.

jwdenny13 I really like this solution but is it possible to add this behavior dynamically?

How can I check from the command-line if my integrated Wi-Fi adapter is disabled? Such “conceptual nulls” cannot be saved to the database, hence the exception. Fill in your details below or click an icon to log in: Email (required) (Address never made public) Name (required) Website You are commenting using your WordPress.com account. (LogOut/Change) You are I tried to disable proxy generation and lazy loading but to no avail.

An example model Consider the following model representing students, report cards, and honors advisors. What exactly am I doing wrong here? EntityFramework Brock Allen | http://brockallen.com DevelopMentor | http://www.develop.com thinktecture | http://www.thinktecture.com/ Reply Jinish Member 401 Points 127 Posts Re: Cascade delete rule not working with Entity Framework Code First Jun 14, http://tubemuse.com/entity-framework/entity-framework-insert-not-working.html How would you go about implementing that in EF?

A tell tale sign of this is that if you open up something like SqlProfiler, you will notice the EF issuing DELETE requests for dependent entities that it knows about (i.e. Reply Arthur Vickers says: September 11, 2012 at 9:23 am It would be great if you could provide examples. All-Star 24009 Points 4088 Posts Microsoft Re: Cascade delete rule not working with Entity Framework Code First Jun 16, 2014 01:59 AM|Starain chen - MSFT|LINK Hi Jinish, Base on your code,