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91 lines
3.4 KiB
Plaintext
91 lines
3.4 KiB
Plaintext
---
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title: Relation Fields
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description: Connect records across different objects using relation fields.
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---
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## Types of Relations
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### One-to-Many
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One record in Object A can be linked to many records in Object B.
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**Example:** One Company can have many People (employees).
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### Many-to-One
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Many records in Object A can be linked to one record in Object B.
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**Example:** Many People can belong to one Company.
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### Relations to Multiple Object Types
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Some objects can link to multiple object types on one side of the relation.
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**Example:** A Note can be attached to one Person AND one Company AND one Opportunity simultaneously. The Note is on the "many" side, connecting to multiple "one" sides.
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<img src="/images/user-guide/fields/many-to-one-morph.png" style={{width:'100%'}}/>
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Similarly, a Project (on the "one" side) could receive links from multiple People, multiple Companies, and multiple Notes.
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<img src="/images/user-guide/fields/one-to-many-morph.png" style={{width:'100%'}}/>
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<Warning>
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**Import/Export limitation**: Relations pointing to multiple object types are not yet supported for CSV import/export. This is on our roadmap.
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</Warning>
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### Many-to-Many
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Many records in Object A can be linked to many records in Object B.
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**Example:** Many People can be linked to many Projects, and vice versa.
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Many-to-many relations use a **junction object** pattern: an intermediate object that connects both sides. With the junction relation feature, Twenty displays the final linked records directly, hiding the intermediate object from the UI.
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<img src="/images/user-guide/fields/junction-relation-diagram.png" style={{width:'100%'}}/>
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<Warning>
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**Lab Feature**: Junction relations must be enabled at **Settings → Community → Features** before use.
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</Warning>
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See [How to Create Many-to-Many Relations](/user-guide/data-model/how-tos/create-many-to-many-relations) for a complete step-by-step guide.
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## Creating a Relation Field
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1. Go to **Settings → Data Model**
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2. Select the object where you want to add the relation
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3. Click **+ New field**
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4. Select **Relation** as the field type
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5. Choose the target object(s) to relate to
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6. Configure the relation settings:
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- **Field name on source object**: The name of the relation field on the object you're editing
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- **Field name on destination object**: The name of the relation field that will appear on the target object
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- Relation type (one-to-many, many-to-one)
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7. Click **Save**
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## Standard Relations
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Twenty comes with pre-built relations between standard objects:
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| From Object | To Object | Relation Type |
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|-------------|-----------|---------------|
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| People | Companies | Many-to-One |
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| Opportunities | Companies | Many-to-One |
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| Opportunities | People | Many-to-One |
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## Best Practices
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### Planning Relations
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- **Map your data model**: Plan relations before creating them
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- **Consider direction**: Think about which object "owns" the relationship
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- **Avoid circular dependencies**: Keep your data model clean
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### Naming Relations
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- **Use clear names**: Make it obvious what the relation represents
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- **Be consistent**: Use similar naming patterns across relations
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- **Consider both sides**: Name both sides of the relation appropriately
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### Performance
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- **Don't over-relate**: Too many relations can slow down your workspace
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## Limitations
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- **Deleting relations** removes the link but not the related records
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- **Circular relations** should be avoided for data integrity
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