syncable-entity-types-and-constants

name	syncable-entity-types-and-constants
description	Define types, entities, and central constant registrations for syncable entities in Twenty's workspace migration system. Use when creating new syncable entities, defining TypeORM entities, flat entity types, or registering in central constants (ALL_ENTITY_PROPERTIES_CONFIGURATION_BY_METADATA_NAME, ALL_METADATA_RELATIONS, ALL_UNIVERSAL_METADATA_RELATIONS).

Syncable Entity: Types & Constants (Step 1/6)

Purpose: Define all types, entities, and register in central constants. This is the foundation - everything else depends on these types being correct.

When to use: First step when creating any new syncable entity. Must be completed before other steps.

---

Quick Start

This step creates:

1. Metadata name constant (twenty-shared)
2. TypeORM entity (extends SyncableEntity)
3. Flat entity types
4. Action types (universal + flat)
5. Central constant registrations (4 constants)

---

Step 1: Add Metadata Name

File: packages/twenty-shared/src/metadata/all-metadata-name.constant.ts

export const ALL_METADATA_NAME = {
  // ... existing entries
  myEntity: 'myEntity',
} as const;

---

Step 2: Create TypeORM Entity

File: src/engine/metadata-modules/my-entity/entities/my-entity.entity.ts

import { Entity, Column, ManyToOne, JoinColumn } from 'typeorm';
import { SyncableEntity } from 'src/engine/workspace-manager/types/syncable-entity.interface';

@Entity({ name: 'myEntity' })
export class MyEntityEntity extends SyncableEntity {
  @Column({ type: 'varchar' })
  name: string;

  @Column({ type: 'varchar' })
  label: string;

  @Column({ type: 'boolean', default: true })
  isCustom: boolean;

  // Foreign key example (optional)
  @Column({ type: 'uuid', nullable: true })
  parentEntityId: string | null;

  @ManyToOne(() => ParentEntityEntity, { nullable: true })
  @JoinColumn({ name: 'parentEntityId' })
  parentEntity: ParentEntityEntity | null;

  // JSONB column example (optional)
  @Column({ type: 'jsonb', nullable: true })
  settings: Record<string, any> | null;
}

Key rules:

• Must extend SyncableEntity (provides id, universalIdentifier, applicationId, etc.)
• Must have isCustom boolean column
• Use @Column({ type: 'jsonb' }) for JSON data

---

Step 3: Define Flat Entity Types

File: src/engine/metadata-modules/flat-my-entity/types/flat-my-entity.type.ts

import { type FlatEntityFrom } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-from.type';
import { type MyEntityEntity } from 'src/engine/metadata-modules/my-entity/entities/my-entity.entity';

export type FlatMyEntity = FlatEntityFrom<MyEntityEntity>;

Maps file (if entity has indexed lookups):

// flat-my-entity-maps.type.ts
export type FlatMyEntityMaps = {
  byId: Record<string, FlatMyEntity>;
  byName: Record<string, FlatMyEntity>;
  // Add other indexes as needed
};

---

Step 4: Define Editable Properties

File: src/engine/metadata-modules/flat-my-entity/constants/editable-flat-my-entity-properties.constant.ts

export const EDITABLE_FLAT_MY_ENTITY_PROPERTIES = [
  'name',
  'label',
  'description',
  'parentEntityId',
  'settings',
] as const satisfies ReadonlyArray<keyof FlatMyEntity>;

Rule: Only include properties that can be updated (exclude id, createdAt, universalIdentifier, etc.)

---

Step 5: Define Action Types

File: src/engine/workspace-manager/workspace-migration/workspace-migration-builder/builders/my-entity/types/workspace-migration-my-entity-action.type.ts

import { type FlatMyEntity } from 'src/engine/metadata-modules/flat-my-entity/types/flat-my-entity.type';
import { type UniversalFlatMyEntity } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-my-entity.type';

// Universal actions (used by builder/runner)
export type UniversalCreateMyEntityAction = {
  type: 'create';
  metadataName: 'myEntity';
  universalFlatEntity: UniversalFlatMyEntity;
};

export type UniversalUpdateMyEntityAction = {
  type: 'update';
  metadataName: 'myEntity';
  universalFlatEntity: UniversalFlatMyEntity;
  universalUpdates: Partial<UniversalFlatMyEntity>;
};

export type UniversalDeleteMyEntityAction = {
  type: 'delete';
  metadataName: 'myEntity';
  universalFlatEntity: UniversalFlatMyEntity;
};

// Flat actions (internal to runner)
export type FlatCreateMyEntityAction = {
  type: 'create';
  metadataName: 'myEntity';
  flatEntity: FlatMyEntity;
};

export type FlatUpdateMyEntityAction = {
  type: 'update';
  metadataName: 'myEntity';
  flatEntity: FlatMyEntity;
  updates: Partial<FlatMyEntity>;
};

export type FlatDeleteMyEntityAction = {
  type: 'delete';
  metadataName: 'myEntity';
  flatEntity: FlatMyEntity;
};

---

Step 6: Register in Central Constants

6a. AllFlatEntityTypesByMetadataName

File: src/engine/metadata-modules/flat-entity/types/all-flat-entity-types-by-metadata-name.ts

export type AllFlatEntityTypesByMetadataName = {
  // ... existing entries
  myEntity: {
    flatEntityMaps: FlatMyEntityMaps;
    universalActions: {
      create: UniversalCreateMyEntityAction;
      update: UniversalUpdateMyEntityAction;
      delete: UniversalDeleteMyEntityAction;
    };
    flatActions: {
      create: FlatCreateMyEntityAction;
      update: FlatUpdateMyEntityAction;
      delete: FlatDeleteMyEntityAction;
    };
    flatEntity: FlatMyEntity;
    universalFlatEntity: UniversalFlatMyEntity;
    entity: MyEntityEntity;
  };
};

6b. ALL_ENTITY_PROPERTIES_CONFIGURATION_BY_METADATA_NAME

File: src/engine/metadata-modules/flat-entity/constant/all-entity-properties-configuration-by-metadata-name.constant.ts

export const ALL_ENTITY_PROPERTIES_CONFIGURATION_BY_METADATA_NAME = {
  // ... existing entries
  myEntity: {
    name: { toCompare: true },
    label: { toCompare: true },
    description: { toCompare: true },
    parentEntityId: {
      toCompare: true,
      universalProperty: 'parentEntityUniversalIdentifier',
    },
    settings: {
      toCompare: true,
      toStringify: true,
      universalProperty: 'universalSettings',
    },
  },
} as const;

Rules:

• toCompare: true → Editable property (checked for changes)
• toStringify: true → JSONB/object property (needs JSON serialization)
• universalProperty → Maps to universal version (for foreign keys & JSONB with SerializedRelation)

6c. ALL_METADATA_RELATIONS

File: src/engine/metadata-modules/flat-entity/constant/all-metadata-relations.constant.ts

export const ALL_METADATA_RELATIONS = {
  // ... existing entries
  myEntity: {
    manyToOne: {
      workspace: null,
      application: null,
      parentEntity: {
        metadataName: 'parentEntity',
        flatEntityForeignKeyAggregator: 'myEntityIds',
        foreignKey: 'parentEntityId',
        isNullable: false,
      },
    },
    oneToMany: {
      childEntities: { metadataName: 'childEntity' },
    },
    // Only if JSONB contains SerializedRelation fields
    serializedRelations: {
      fieldMetadata: true,
    },
  },
} as const;

6d. ALL_UNIVERSAL_METADATA_RELATIONS

File: src/engine/workspace-manager/workspace-migration/universal-flat-entity/constants/all-universal-metadata-relations.constant.ts

export const ALL_UNIVERSAL_METADATA_RELATIONS = {
  // ... existing entries
  myEntity: {
    manyToOne: {
      workspace: null,
      application: null,
      parentEntity: {
        metadataName: 'parentEntity',
        foreignKey: 'parentEntityId',
        universalForeignKey: 'parentEntityUniversalIdentifier',
        universalFlatEntityForeignKeyAggregator: 'myEntityUniversalIdentifiers',
        isNullable: false,
      },
    },
    oneToMany: {
      childEntities: { metadataName: 'childEntity' },
    },
  },
} as const;

---

Checklist

Before moving to Step 2:

• Metadata name added to ALL_METADATA_NAME
• TypeORM entity created (extends SyncableEntity)
• isCustom column added
• Flat entity type defined
• Flat entity maps type defined (if needed)
• Editable properties constant defined
• Universal and flat action types defined
• Registered in AllFlatEntityTypesByMetadataName
• Registered in ALL_ENTITY_PROPERTIES_CONFIGURATION_BY_METADATA_NAME
• Registered in ALL_METADATA_RELATIONS
• Registered in ALL_UNIVERSAL_METADATA_RELATIONS
• TypeScript compiles without errors

---

Next Step

Once all types and constants are defined, proceed to: Syncable Entity: Cache & Transform (Step 2/6)

For complete workflow, see @creating-syncable-entity rule.