IT:AD:EF/CodeFirst:HowTo:Define Models/Entities

• (UP)

  • IT:AD:EF/CodeFirst:HowTo:Define Models/Relationships
    • IT:AD:EF/CodeFirst:HowTo:Define Models/Relationships/Examples
  • IT:AD:EF/CodeFirst:HowTo:Define Models/Entities
  • IT:AD:EF/CodeFirst:HowTo:Define Models/OnModelCreating and EntityTypeConfiguration
  • IT:AD:EF/CodeFirst:HowTo:Define Models/Properties
  • IT:AD:EF/CodeFirst:HowTo:Define Models/Properties/ComplexTypes
  • IT:AD:EF/CodeFirst:HowTo:Define Models/Properties/Identities
  • IT:AD:EF/CodeFirst:HowTo:Define Models/Unique Indexes

• MUST: Parameter less constructor
• MUST: Not be sealed or abstract
• MUST: Have a PK.

  • Convention: Named Id or <Entity>Id
  • DataAnnotation: [Key()] (see Annotations)
  • FluentAPI: modelBuilder.Entity<Person>().HasKey(ma => ma.SSN);(see IT:AD:Code First:FluentAPI:Properties)

  * COULD:Table Name mapping can be forced by:

  • DataAnnotation: [ClassName] (see Annotations):
  • FluentAPI: within DataContext.OnModelCreating(): modelBuilder.Entity<Invoice>().Property(i => i.Name) .HasColumnName("ClientInvoices"); (see IT:AD:Code First:FluentAPI):
    • Note: For more complex mapping: http://bit.ly/tjUwK8
• CONSIDER: You can exclude entities:
  • DataAnnotation: [NotMapped] (see IT:AD:Code First:DataAnnotations)
  • FluentAPI: within DataContext.OnModelCreating(): modelBuilder.Ignore<Invoice>() (see IT:AD:Code First:FluentAPI) Example:

modelBuilder.Entity<X>.MapSingleType().ToTable("xyxTable");

• CONSIDER: Watch out for design flaw of making Entitities into Anemic Entities
  • Consider using Partial or Extension Methods to contain Domain Logic in Entities rather than forcing it to be included in the Application Layer outsider of the Domain Layer.
  • _graphContext.Configuration.AutoDetectChangesEnabled = false;