Home > Entity Framework > Entity Framework Code First Cascade Delete Not Working

Entity Framework Code First Cascade Delete Not Working

Contents

What is the best way to tell exactly which ‘foreign-key property' it is complaining about with this error ? Note that this doesn’t mean that the student must have report cards—she could have none. The content you requested has been removed. 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 his comment is here

I have a window where the user can manage some IPTV packs, compound by some service, products and other properties. Reply Leave a Reply Cancel reply Enter your comment here... If you generate an EF model from this database you get a model that on the surface looks no different from normal: But if you dig into the CSDL section of To do this, EF has generated another column in your Manager table.

Entity Framework Cascade Delete Database First

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. Filters this list for any that do not reference a student. Reply Follow UsPopular TagsEF Tips Entity Framework Tricks EDM C# Data Services Metadata EF 4.0 Community DSP Object Services Astoria Philosophical Ramblings LINQ to Entities LINQ OData Samples Expressions Archives May This documentation is archived and is not being maintained.

Doing so would open up massive possibilities for data corruption. Say you have two objects called Department and Manager. Get 10 Days Free Recommended for you Prev Working with Inverse Navigation Properties Next Exploring Many-to-Many Relationships Explore Tour Pricing Enterprise Government Education Queue App Learn Blog Contact Careers Press Resources Entity Framework Enable Cascade Delete Mind taking a quick peek and comment on how bad (or good) this idea is?

Because how would we know what the key of the Deparment is when I only want to query the Manager object? Alex Reply kiran says: August 14, 2012 at 2:08 am Hi Alex, I couldn't get you , how exactly you override SaveChanges and delete all the Dependents.Can you explain with little Let's say I have the following tables, cleverly named after myself: 'JohnsParentTable' (Id, Description) 'JohnsChildTable' (Id, JohnsParentTableId, Description) With the resulting classes looking like so public class JohnsParentTable { public int Armistice Day Challenge Understanding which string breaks when one pulls on a hanging block from below Pick Randomly Between -1 or 1 Why were pre-election polls and forecast models so wrong

The HasRequired and HasOptional methods take a lambda expression that represents a reference navigation property. Entity Framework Cascade Delete One To Many Reply Arthur Vickers says: October 29, 2014 at 12:54 pm @Jason I'm not sure what you are seeing. Any help would be greatly appreciated!!! 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.

Entity Framework Code First Disable Cascade Delete

The lifetime of the EF context is the lifetime of the wpf window in most of cases. Turn off cascading delete: Use Fluent API to configure entities to turn off the cascading delete as shown below. Entity Framework Cascade Delete Database First On the End1 OnDelete property the value will probably be None. Entity Framework Cascade Delete Code First One To Many When I first used modelBuilder.Entity() .HasOptional(a => a.UserDetail) .WithOptionalDependent() .WillCascadeOnDelete(true); The migration code was: AddForeignKey("User", "UserDetail_UserId", "UserDetail", "UserId", cascadeDelete: true); but it does not match any of the two overloads available

How to find the file where a bash function is defined? this content We’ll also remove all of the related code that mentions the Lodgings. FK to be deleted in tables when optional entity deleted see more linked questions… Related 0Cascade Deleting Many-To-Many relationship in entity framework7Entity Framework on delete cascade12EF4.1 Code First : How to The other option is Cascade; set it to that. Entity Framework Code First Cascade Delete Annotation

Thus, EF enables cascade delete by default. However, if the property is non-nullable then EF instead conceptually sets it to null without actually doing so. Guaranteed time for an airline to provide luggage Why (and when) does pattern matching with f[__] perform MUCH more quickly than _f? weblink If you are _only_ setting FKs then you should not be getting this exception.

EF is never going to make the assumption that if you mark something as deleted and then saving fails that you now don't want the deleted thing to be deleted. Entity Framework Cascade Delete Many To Many Consider the following model representing offers formed by one pack, where each pack can contain many services. Advanced Concepts Mapping to Nontable Database Objects Removing Conventions Taking Control of Model Caching Working with the EdmMetadata Table Using Code First with ObjectContext Summary 8.

Not the answer you're looking for?

Reply Adrian says: May 10, 2013 at 2:48 am Thanks for this great post!. Essentially what is happening here is that the Entity Framework expects that deleting the principal in the database, will delete all it’s dependents in the database. Only, this is not the only difference in your project. Entity Framework Cascade Delete Default Delete and UpdateOrInsert methods in my generic o base repository are.

What is this line of counties voting for the Democratic party in the 2016 elections? The answer is that you get an exception reading: System.InvalidOperationException: The operation failed: The relationship could not be changed because one or more of the foreign-key properties is non-nullable. Post navigation ← The key toAddOrUpdate Why open sourcing Entity Framework is a greatmove → 36 comments on “Deleting orphans with EntityFramework” Alan says: June 5, 2012 at 7:18 am Sure, http://tubemuse.com/entity-framework/entity-framework-insert-not-working.html Follow me on TwitterMy TweetsTagsAddDbContext Agile Backing fields C# Cascade delete Change Tracking Code First Code First Migrations ConcurrentDictionary CreateDelegate CTP Data Annotations Database First Database Initializers DbCollectionEntry DbContext DbContextOptions DbContextOptionsBuilder

Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints. This can be useful when using nullable types such as strings as keys. Detecting changes is paramount before using the Local call (which EF automatically does), but it can be safely turned off when calling the For Each {remove} call. So, we change our object to this code: If you generate your database again, you see that some things are changed.

Although the operation has failed, the EntityEntry (Pack) and the RelationshipEntry (Pack - Service) remains marked as deleted. Code ladder, Robbers Does the Rothschild family own most central banks? Why are auto leases stubbornly strict about visa status and how to work around that? Dumping my test database contents before and after shows this: Before: Students: Student Pinky Pie with advisor Princess Celestia Student Rainbow Dash with advisor Princess Celestia Report cards: Report card for

To do this we can make navigation properties. Disabling DetectChanges in this case is certainly a good idea. News Archives September 2012 (1) February 2011 (1) January 2011 (1) December 2010 (2) June 2010 (2) May 2010 (2) April 2010 (2) March 2010 (3) February 2010 (3) January 2010 For example, the HonorsAdvisorId property of Student.

You can do this with the next line of code in your OnModelCreating override: If you generate your database again with the latest classes (class with DepartmentId) your Foreign Key relationship EF automatically deletes related records in the middle table for many-to-many relationship entities if one or other entity is deleted.