# Update a metaobject definition > Partially update a metaobject definition using JSON Merge Patch. {/* generated:versioned-pages - edit _pm-authored, not this file */} `PATCH /api/metaobject_definitions/{id}` Updates the MetaobjectDefinition resource. Partially updates a metaobject definition. The body is a [JSON Merge Patch](https://datatracker.ietf.org/doc/html/rfc7396) document: change the `name`, `displayNameField`, or the `fieldDefinitions`. > **Changing fields affects records** > > Editing `fieldDefinitions` changes the shape every [Metaobject](/api/product-management/metaobjects/) of this type is validated against. Removing or retyping a field can invalidate existing records' values. ## Path parameters | Name | Type | Required | Description | | ---- | -------- | -------- | ------------------------------- | | `id` | `string` | Yes | MetaobjectDefinition identifier | ## Request body | Property | Type | Required | Description | | ------------------ | --------------------------------------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `description` | `string \| null` | - | | | `displayNameField` | `string \| null` | - | The key of the field definition used as the display name for records of this type. Optional - when omitted it is null and records have no derived display name. When set, it must match the key of one of this definition's fieldDefinitions, otherwise the request is rejected with 422. | | `fieldDefinitions` | `EmbeddedMetaobjectFieldDefinitionResource[]` | - | The field definitions that make up this metaobject definition. | | `name` | `string \| null` | - | | ## Response **200** - MetaobjectDefinition resource updated | Property | Type | Required | Description | | ------------------ | --------------------------------------------- | -------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `createdAt` | `string` | - | The date and time when the resource was created (ISO 8601 format). | | `description` | `string \| null` | - | The description of the metaobject definition. | | `displayNameField` | `string \| null` | - | The key of the field definition used as the display name for records of this type. Optional - when omitted it is null and records have no derived display name. When set, it must match the key of one of this definition's fieldDefinitions, otherwise the request is rejected with 422. | | `fieldDefinitions` | `EmbeddedMetaobjectFieldDefinitionResource[]` | - | The field definitions that make up this metaobject definition. | | `id` | `string` | - | The resource's unique identifier (UUID). | | `name` | `string` | Yes | The human-readable name of the metaobject definition. | | `type` | `string` | Yes | The unique slug identifier for this metaobject definition. | | `updatedAt` | `string` | - | The date and time when the resource was last modified (ISO 8601 format). | ## Errors **400** - Invalid input | Property | Type | Required | Description | | ------------- | ------------------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------ | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `code` | `string` | - | Stable identifier of the error in the error code catalogue (see /api/error-codes). Present on catalogued errors only. | | `description` | `string \| null` | - | | | `detail` | `string \| null` | - | A human-readable explanation specific to this occurrence of the problem. | | `instance` | `string \| null` | - | A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced. | | `message` | `string` | - | End-user message localized in the request locale, with this occurrence's values substituted. Present on catalogued errors only. | | `slug` | `string` | - | Stable, readable key of the error in the error code catalogue. Present on catalogued errors only. | | `status` | `integer \| null` | - | | | `title` | `string \| null` | - | A short, human-readable summary of the problem. For a catalogued error it repeats the `slug`. | | `type` | `string` | - | A URI reference that identifies the problem type. For a catalogued error it is the error code resource, `/api/error-codes/{code}`. | **403** - Access denied. The caller is missing one or more permissions required for this operation. | Property | Type | Required | Description | | -------------------- | ------------------ | -------- | ---------------------------------------------------------------------------------------------------------------------- | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `detail` | `string` | - | | | `missingPermissions` | `string[]` | - | Permissions that the caller is missing for this operation. Present only when the 403 is caused by a denied permission. | | `status` | `integer` | - | | | `title` | `string` | - | | | `type` | `string` | - | | **404** - Not found | Property | Type | Required | Description | | ------------- | ------------------ | -------- | ------------------------------------------------------------------------------------------------------------------------------------ | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `code` | `string` | - | Stable identifier of the error in the error code catalogue (see /api/error-codes). Present on catalogued errors only. | | `description` | `string \| null` | - | | | `detail` | `string \| null` | - | A human-readable explanation specific to this occurrence of the problem. | | `instance` | `string \| null` | - | A URI reference that identifies the specific occurrence of the problem. It may or may not yield further information if dereferenced. | | `message` | `string` | - | End-user message localized in the request locale, with this occurrence's values substituted. Present on catalogued errors only. | | `slug` | `string` | - | Stable, readable key of the error in the error code catalogue. Present on catalogued errors only. | | `status` | `integer \| null` | - | | | `title` | `string \| null` | - | A short, human-readable summary of the problem. For a catalogued error it repeats the `slug`. | | `type` | `string` | - | A URI reference that identifies the problem type. For a catalogued error it is the error code resource, `/api/error-codes/{code}`. | **422** - An error occurred | Property | Type | Required | Description | | ------------- | ------------------ | -------- | ----------- | | `@context` | `string \| object` | - | | | `@id` | `string` | Yes | | | `@type` | `string` | Yes | | | `description` | `string` | - | | | `detail` | `string` | - | | | `instance` | `string \| null` | - | | | `status` | `integer` | - | | | `title` | `string \| null` | - | | | `type` | `string` | - | | | `violations` | `object[]` | - | | ## Examples ### Example request ```bash curl -X PATCH 'https://.product-management.flowkiwi.net/api/metaobject_definitions/' \ -H 'Authorization: Bearer {access_token}' \ -H 'Flowkiwi-Api-Version: unstable' \ -H 'Accept: application/ld+json' \ -H 'Content-Type: application/merge-patch+json' \ -d '{ "name": "Size chart" }' ``` ### Example response ```json { "@context": "/api/contexts/MetaobjectDefinition", "@id": "/api/metaobject_definitions/019afc01-1a2b-7c3d-8e4f-0a1b2c3d4e5f", "@type": "MetaobjectDefinition", "createdAt": "2026-01-15T09:30:00+00:00", "description": "Size charts shown on product pages.", "displayNameField": "title", "fieldDefinitions": [ { "description": "The size guide title.", "id": "019afc02-2b3c-7d4e-9f50-1a2b3c4d5e6f", "key": "title", "name": "Title", "required": true, "type": "/api/metafield_definition_types/single_line_text_field", "validations": [] }, { "description": "The size chart body.", "id": "019afc03-3c4d-7e5f-8a60-2b3c4d5e6f70", "key": "body", "name": "Body", "required": false, "type": "/api/metafield_definition_types/multi_line_text_field", "validations": [] } ], "id": "019afc01-1a2b-7c3d-8e4f-0a1b2c3d4e5f", "name": "Size guide", "type": "size_guide", "updatedAt": "2026-02-03T14:45:12+00:00" } ```