awesome-copilot/skills/efcore-d2-db-diagram/references/efcore-model-extraction.md

EF Core Model Extraction

Files to inspect

Inspect, in this order:

1. DbContext classes.
2. DbSet<T> declarations.
3. OnModelCreating.
4. IEntityTypeConfiguration<T> classes.
5. Entity classes.
6. Migrations and model snapshot.
7. Data annotations.

Mapping priority

When sources conflict, use:

1. Latest migration / model snapshot.
2. Fluent API.
3. Data annotations.
4. EF Core conventions.
5. C# shape.

Important EF Core APIs

Look for:

• ToTable
• HasKey
• HasAlternateKey
• HasIndex
• IsUnique
• Property
• HasColumnName
• HasColumnType
• IsRequired
• HasMaxLength
• HasConversion
• HasOne
• WithMany
• WithOne
• HasForeignKey
• OnDelete
• OwnsOne
• OwnsMany
• UsingEntity
• Ignore

Migrations

Use migrations to detect:

• Actual table names.
• Join tables.
• Shadow FK columns.
• Indexes.
• Composite keys.
• Delete behaviors.
• Migration-only tables.