> ## Documentation Index
> Fetch the complete documentation index at: https://docs.e6data.com/llms.txt
> Use this file to discover all available pages before exploring further.

# List relations

> list relations. GET /api/v1/catalogs/{catalog_id}/relations. Uses the same payload, validation, revision checks and response as the unified HTTP API.

ReferenceApplies to: Unified engine deployments

## Related guidance

[Addresses and access](https://docs.e6data.com/transformation/http/access.md) · [Request identity](https://docs.e6data.com/transformation/http/request-identity.md) · [Errors and recovery](https://docs.e6data.com/transformation/http/errors.md) · [Pagination and results](https://docs.e6data.com/transformation/http/results.md)


## OpenAPI

````yaml openapi/transformation.json GET /api/v1/catalogs/{catalog_id}/relations
openapi: 3.1.0
info:
  description: >-
    HTTP contracts for the Unified engine. Requests use the connected
    deployment's access model and configured owner. Response examples are
    illustrative; inspect your engine response in your client. SQL-managed
    secrets, credentials, streaming pipelines and maintenance run through
    session operations.
  title: Laminar Unified HTTP API
  version: v1
servers:
  - url: https://engine.example.com
    description: >-
      Example engine origin. Replace it with your deployment URL and any API
      mount prefix.
security: []
paths:
  /api/v1/catalogs/{catalog_id}/relations:
    get:
      tags:
        - Catalogs and tables
      summary: list relations
      description: >-
        list relations. GET /api/v1/catalogs/{catalog_id}/relations. Uses the
        same payload, validation, revision checks and response as the unified
        HTTP API.
      operationId: list_relations
      parameters:
        - in: path
          name: catalog_id
          required: true
          schema:
            format: uuid
            type: string
        - in: query
          name: continuation_token
          required: false
          schema:
            type: string
        - in: query
          name: kind
          required: false
          schema:
            enum:
              - Table
              - View
        - in: query
          name: limit
          required: false
          schema:
            description: >-
              Page size, bounded by the server. For query results this counts
              Arrow batches, default 1.
            minimum: 1
            type: integer
        - in: query
          name: namespace
          required: false
          schema:
            items:
              type: string
            type: array
      responses:
        '200':
          content:
            application/json:
              schema:
                $ref: >-
                  #/components/schemas/data_catalog_core_src_models_mod_rs_RelationListResponse
          description: Successful response.
        default:
          content:
            application/json:
              example:
                error:
                  code: invalid_request
                  message: Check the request fields
              schema:
                $ref: '#/components/schemas/ApiError'
          description: A rejected or failed request. Inspect error.code before retrying.
components:
  schemas:
    data_catalog_core_src_models_mod_rs_RelationListResponse:
      properties:
        relations:
          $ref: '#/components/schemas/shared_common_src_lib_rs_Page_RelationSummary'
      required:
        - relations
      type: object
    ApiError:
      properties:
        error:
          properties:
            code:
              type: string
            message:
              type: string
          required:
            - code
            - message
          type: object
      required:
        - error
      type: object
    shared_common_src_lib_rs_Page_RelationSummary:
      properties:
        continuation_token:
          anyOf:
            - type: string
            - type: 'null'
        items:
          items:
            $ref: >-
              #/components/schemas/data_catalog_core_src_models_mod_rs_RelationSummary
          type: array
      required:
        - items
        - continuation_token
      type: object
    data_catalog_core_src_models_mod_rs_RelationSummary:
      properties:
        kind:
          $ref: >-
            #/components/schemas/data_catalog_core_src_models_mod_rs_RelationKind
        reference:
          $ref: >-
            #/components/schemas/data_catalog_core_src_models_mod_rs_RelationReference
        version:
          anyOf:
            - $ref: >-
                #/components/schemas/data_catalog_core_src_models_mod_rs_MetadataVersion
            - type: 'null'
          description: >-
            None means discovery returned an identifier without loading its
            metadata.
      required:
        - reference
        - kind
        - version
      type: object
    data_catalog_core_src_models_mod_rs_RelationKind:
      oneOf:
        - const: Table
          type: string
        - const: View
          type: string
    data_catalog_core_src_models_mod_rs_RelationReference:
      properties:
        catalog:
          $ref: >-
            #/components/schemas/data_catalog_core_src_models_mod_rs_CatalogReference
        name:
          type: string
        namespace:
          items:
            type: string
          type: array
      required:
        - catalog
        - namespace
        - name
      type: object
    data_catalog_core_src_models_mod_rs_MetadataVersion:
      properties:
        identity:
          type: string
        revision:
          type: string
      required:
        - identity
        - revision
      type: object
    data_catalog_core_src_models_mod_rs_CatalogReference:
      properties:
        catalog_id:
          $ref: '#/components/schemas/shared_common_src_lib_rs_CatalogId'
        revision:
          type: string
      required:
        - catalog_id
        - revision
      type: object
    shared_common_src_lib_rs_CatalogId:
      format: uuid
      type: string

````

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