> ## Documentation Index
> Fetch the complete documentation index at: https://docs.nex.ai/llms.txt
> Use this file to discover all available pages before exploring further.

# Update an attribute definition

> Updates properties of an existing attribute definition



## OpenAPI

````yaml /api-reference/openapi.json patch /v1/objects/{slug}/attributes/{attr_id}
openapi: 3.0.0
info:
  description: >-
    REST API for accessing and managing your Nex data. Generate API keys from
    the Nex web UI and use them to authenticate requests.
  title: Nex Developer API
  contact: {}
  version: '1.0'
servers:
  - url: https://app.nex.ai/api/developers
security: []
paths:
  /v1/objects/{slug}/attributes/{attr_id}:
    patch:
      tags:
        - Schema
      summary: Update an attribute definition
      description: Updates properties of an existing attribute definition
      operationId: updateAttributeDefinition
      parameters:
        - description: Object slug
          name: slug
          in: path
          required: true
          schema:
            type: string
        - description: Attribute definition ID
          name: attr_id
          in: path
          required: true
          schema:
            type: string
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/developer.UpdateAttributeDefinitionRequest'
        description: Fields to update
        required: true
      responses:
        '200':
          description: Updated attribute definition
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/developer.AttributeDefinitionResponse'
        '400':
          description: Bad request - Invalid data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/httpx.APIError'
        '401':
          description: Unauthorized - Invalid or missing API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/httpx.APIError'
        '404':
          description: Object or attribute not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/httpx.APIError'
        '500':
          description: Internal server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/httpx.APIError'
      security:
        - ApiKeyAuth: []
components:
  schemas:
    developer.UpdateAttributeDefinitionRequest:
      type: object
      properties:
        name:
          type: string
          description: New display name
        description:
          type: string
          description: New description
        options:
          $ref: '#/components/schemas/developer.UpdateAttributeOptionsRequest'
      example:
        name: Updated Status
        options:
          is_required: false
          select_options:
            - id: existing-id
              name: Renamed
            - name: New Option
    developer.AttributeDefinitionResponse:
      type: object
      properties:
        description:
          type: string
        id:
          type: string
        name:
          type: string
        options:
          $ref: '#/components/schemas/developer.AttributeOptionsResponse'
        slug:
          type: string
        type:
          type: string
    httpx.APIError:
      type: object
      properties:
        code:
          type: integer
        message:
          type: string
    developer.UpdateAttributeOptionsRequest:
      type: object
      properties:
        is_required:
          type: boolean
        use_raw_format:
          type: boolean
        is_whole_number:
          type: boolean
        select_options:
          type: array
          items:
            $ref: '#/components/schemas/developer.CreateSelectOptionRequest'
          description: >-
            Updated select options. Include id to update existing, omit id to
            create new.
    developer.AttributeOptionsResponse:
      type: object
      properties:
        is_multi_value:
          type: boolean
        is_required:
          type: boolean
        is_unique:
          type: boolean
        is_whole_number:
          type: boolean
        select_options:
          type: array
          items:
            $ref: '#/components/schemas/developer.SelectOptionResponse'
        use_raw_format:
          type: boolean
    developer.CreateSelectOptionRequest:
      type: object
      required:
        - name
      properties:
        id:
          type: string
          description: Option ID (optional on create, auto-generated if omitted)
        name:
          type: string
          description: Option display label
    developer.SelectOptionResponse:
      type: object
      properties:
        id:
          type: string
        name:
          type: string
  securitySchemes:
    ApiKeyAuth:
      description: 'API key for authentication (format: "Bearer YOUR_API_KEY")'
      type: apiKey
      name: Authorization
      in: header

````