Relationship Rules

One-to-one

Detected from:

• HasOne(...).WithOne(...)
• Unique FK index.
• Shared primary key relationship.

Render dependent to principal:

Many-to-many

Detected from:

• UsingEntity
• Two collection navigations without explicit join entity.
• Migration-created join table with two FKs and composite key.

Render the join table explicitly by default.

Owned types

Detected from:

• OwnsOne
• OwnsMany
• [Owned]

Inline by default unless table splitting or separate table mapping is detected.

Optional relationships

A relationship is optional when:

• FK is nullable.
• IsRequired(false) is configured.
• Migration column is nullable.

Use dashed line for optional relationships.