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

# Turn a described rule into relation filter conditions

> Translates a plain-language description of which rows a relation may point at into validated filter conditions.

Nothing is saved: the conditions come back for review, and are stored by sending them to `PUT /table/column/{columnId}` as `oneMany.filter`.

Returns 422 when the description does not describe a rule over the available columns.



## OpenAPI

````yaml post /table/column/{columnId}/filter/compose
openapi: 3.1.0
info:
  title: HERO API
  version: current
  description: |-
    The HERO REST API.

    See https://developers.myhero.so for the rendered docs.
servers:
  - url: https://app.myhero.so
security: []
paths:
  /table/column/{columnId}/filter/compose:
    post:
      tags:
        - Tables
      summary: Turn a described rule into relation filter conditions
      description: >-
        Translates a plain-language description of which rows a relation may
        point at into validated filter conditions.


        Nothing is saved: the conditions come back for review, and are stored by
        sending them to `PUT /table/column/{columnId}` as `oneMany.filter`.


        Returns 422 when the description does not describe a rule over the
        available columns.
      operationId: composeColumnFilter
      parameters:
        - schema:
            type: string
            minLength: 1
          required: true
          name: columnId
          in: path
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                description:
                  type: string
                  minLength: 1
              required:
                - description
      responses:
        '200':
          description: 200 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      filter:
                        type: array
                        items:
                          type: object
                          properties:
                            targetColumnId:
                              type: string
                              minLength: 1
                            op:
                              type: string
                              minLength: 1
                            value: {}
                            sourceColumnId:
                              type: string
                          required:
                            - targetColumnId
                            - op
                      filterConjunction:
                        type: string
                        enum:
                          - and
                          - or
                      preview:
                        type:
                          - object
                          - 'null'
                        properties:
                          matched:
                            type: number
                          total:
                            type: number
                        required:
                          - matched
                          - total
                      perRow:
                        type: boolean
                    required:
                      - filter
                      - filterConjunction
                      - preview
                      - perRow
                required:
                  - data
        '400':
          description: 400 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
        '403':
          description: 403 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
        '404':
          description: 404 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
        '422':
          description: 422 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
        '429':
          description: 429 response
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: string
                    description: |-
                      Error class name (e.g.

                      ValidationError, NotFound)
                  message:
                    type: string
                    description: Human-readable error message
                  details:
                    type: array
                    items: {}
                required:
                  - error
                  - message
      security:
        - bearerAuth: []
components:
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: HERO personal access token

````

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