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Mikael
60 lines
1010 B
Markdown
60 lines
1010 B
Markdown
# Relationship Rules
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## One-to-many
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Detected from:
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- `HasOne(...).WithMany(...)`
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- FK property on dependent entity.
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- Collection navigation on principal entity.
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Render dependent to principal:
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```d2
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Orders.ClientId -> Clients.Id: "N:1"
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```
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## One-to-one
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Detected from:
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- `HasOne(...).WithOne(...)`
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- Unique FK index.
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- Shared primary key relationship.
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Render dependent to principal:
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```d2
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ClientProfiles.ClientId -> Clients.Id: "1:1"
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```
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## Many-to-many
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Detected from:
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- `UsingEntity`
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- Two collection navigations without explicit join entity.
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- Migration-created join table with two FKs and composite key.
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Render the join table explicitly by default.
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## Owned types
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Detected from:
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- `OwnsOne`
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- `OwnsMany`
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- `[Owned]`
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Inline by default unless table splitting or separate table mapping is detected.
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## Optional relationships
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A relationship is optional when:
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- FK is nullable.
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- `IsRequired(false)` is configured.
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- Migration column is nullable.
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Use dashed line for optional relationships.
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