A way to configure Entity Framework beyond its conventions with a method chaining API
Use the tag for questions that ask about:
- Model-wide settings
- Property mapping
- Type mapping
- Relationships
The EF-Fluent API can be used in both c# and VB.NET.
Questions tagged [ef-fluent-api]
833 questions
0
votes
1 answer
How do I set up the relation using Fluent API between an Employee entity and an ICollection?
I am using entity framework and I have an Employee entity among other entities. One navigation property that I want Employee to have is a list of Employees that this Employee manages. This is the Employee class (it actually uses an EF prefix, but…
Drew
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votes
1 answer
EF6 Fluent Api - I need to set Default value in FluentApi in order to Map Child to be used instead of Parent
Here's part of the setup. Names are simplified:
I have following classes:
MyClass
MySubclass1 : MyClass
MySubClass2 : MyClass
MyClass is part of another class (and table), which I will leave out.
I'm trying to do an EF6 query (using…
Recipe
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votes
1 answer
Entity Framework Fluent API relationship mapping HasRequired().WithRequired() not behaving correctly without Map()
Blog Model
using System.Collections.Generic;
namespace DataLayer
{
public class Blog
{
public int BlogKey { get; set; }
public string Title { get; set; }
public string BloggerName { get; set; }
public virtual…
blogbydev
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2 answers
How to relate model property to same model in ASP.NET MVC?
Sometimes, you want to store who registered or created a user account. It's either the user registered himself/herself or some other user account registered him, such as Admin accounts. So, the User table would something like:
public class User :…
doncadavona
- 7,162
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votes
1 answer
Entity Framework fluent api how to conditionally map multiple properties to a single table
Using fluent api, how do I map multiple properties of the same data type to a single table conditionally.
Database Model:
ListType would include the Grouping names i.e. Allergens
ListItem would include all possible values for the given…
alex.davis.dev
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- 18
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0 answers
Mapping Entity Framework from Existing Database with Custom Field Structure
I'm using Entity Framework 6 with a Code First approach. We use a commercial, off the shelf software solution that I'm rolling up into our own custom application. In addition to having the basic tables for Employee, Salary, JobDetail where this is…
Mike
- 135
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- 10
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1 answer
Entity Framework 6 NotMapped attributes
Is there a way using the fluentAPI within a DbContext to manually include ICollections that have been [NotMapped] in the model? I know how to manually ignore properties using the fluentAPI
modelBuilder.Entity().Ignore(e =>…
Ted
- 25
- 3
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votes
1 answer
How to solve multiple cascade paths with entity code first
A Template can have zero or many Document and zero or many MetaIndex. A Document can have zero or more Index, and a MetaIndex can also have zero or more Index:
This represent a potential cascade problem because deleting a Template will delete its…
Erre Efe
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0
votes
2 answers
Entity Framework Fluent API configuration
Here is the thing bugging me,
I have 2 entities --- 'Master' and 'Slave', let me list them first:
public class Master
{
public Guid Id {get;set;}
public virtual ICollection Slaves { get; set; }
public virtual Slave ParentSlave {…
wxdtony
- 1
- 1
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votes
1 answer
Exception - A dependent property in a ReferentialConstraint is mapped to a store-generated column. Column: 'Id'
Okay, this is the situation..I'm running into a strange exception, and trough various other answers here on stackoverflow I've figured out that it must have something to do with the mapping between my Project-entity and the one-to-one relation to an…
Rob
- 6,731
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0 answers
Changing column existint in EF, engineering reverse
I have one columnt call "Name" in EF using engineering reverse, i need to change HasMaxLength 50 to HasMaxLength 100.
I did change
this.Property(t => t.Name).HasMaxLength(100);
But not working, how i can update column name 50 to 100.
Thank's
Alice Matsumoto
- 55
- 2
- 8
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votes
1 answer
System.NullReferenceException when Inserting a new item for many-to-many relationship in entity framework
When adding an item for many-to-many relationship, I receive this error
An exception of type 'System.NullReferenceException' occurred in gEchoLu.dll but was not handled in user code
with no further details.
Here is the code that throws the…
renakre
- 8,001
- 5
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- 99
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votes
1 answer
One to zero or one relationship entity framework
I am trying to enforce a one to (zero or one) table relationship using code first/fluent api and the intended table is as below.
Student may only have a contact (StudentContact) or not
But Every contact (StudentContact) must have a Student
StudentID…
vincentsty
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votes
2 answers
foreign key to application user id throwing key errors when updating database
I'm using code first to create a foreign key on YogaSpace that links the ApplicationUsers id to ApplicationUserRefId in the YogaSpace class. So every time I create and insert a new YogaSpace it fills the ApplicationUser id with the id of the person…
chuckd
- 13,460
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0 answers
entity splitting into one table
Using EF 6.1.2. CodeFirst. I have these models:
public class Automobile
{
public int Id { get; set; }
public string Make { get; set; }
public string Model { get; set; }
public string Vin { get; set; }
public int Year { get; set;…
Lorne Redmond
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