Entity Framework Core model definition in C#

🍂 This model configuration is used to map C# objects to the database structure.

Here's what this piece of code does ✨

1. modelBuilder.Entity<WorkItem>(eb => { ... }); - Creates a configuration for an entity named WorkItem within the data model context. All the properties and relationships of this model are defined within this block.

2. eb.Property(wi => wi.State).IsRequired(); - Specifies that the State property is required (NOT NULL) in the database.

3. eb.Property(wi => wi.Area).HasColumnType("varchar200"); - Specifies the column type of the Area property as varchar(200).

4. eb.Property(wi => wi.IterationPath).HasColumnName("Iteration_Path"); - Sets the column name in the database to "Iteration_Path" for the IterationPath property.

5. eb.Property(wi => wi.Efford).HasColumnType("decimal(5,2)"); - Specifies the column type of the Efford property as decimal(5,2).

6. eb.Property(wi => wi.EndDate).HasPrecision(3); - Sets the precision of the EndDate column to 3 decimal places.

7. eb.Property(wi => wi.Activity).HasMaxLength(100); - Specifies a maximum length of 100 characters for the Activity column.

8. eb.Property(wi => wi.RemainingWork).HasPrecision(13,3); - Specifies a precision of 13 total digits and 3 decimal places for the RemainingWork column.

9. eb.HasMany(w => w.comments) ... - Defines a "one-to-many" relationship between the WorkItem entity and the Comment entity.

10. eb.HasOne(w => w.Author) ... - Defines a "one-to-many" relationship between the WorkItem entity and the Author entity.

11. eb.HasMany(w => w.Tags) ... - Defines a "many-to-many" relationship between the WorkItem entity and the Tag entity through the auxiliary entity WorkItemTag. The UsingEntity method is used to customize the mapping of the many-to-many relationship.

The final UsingEntity block configures the intermediary entity WorkItemTag, which allows customization of the mapping of the many-to-many relationship. It also sets a default value for the PublicationDate column using HasDefaultValueSql("getutcdate()").

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This code is an example of model configuration in Entity Framework Core and defines how entities and their relationships will be mapped to a database.