graphql-engine/docs/graphql/manual/api-reference/schema-metadata-api/custom-functions.rst
2020-03-12 01:12:36 +05:30

161 lines
3.4 KiB
ReStructuredText

.. meta::
:description: Manage custom functions with the Hasura schema/metadata API
:keywords: hasura, docs, schema/metadata API, API reference, custom function
.. _api_custom_functions:
Schema/Metadata API Reference: Custom Functions
===============================================
.. contents:: Table of contents
:backlinks: none
:depth: 1
:local:
Track/untrack a custom SQL function in the Hasura GraphQL engine.
Only tracked custom functions are available for querying/mutating/subscribing data over the GraphQL API.
.. _track_function:
track_function
--------------
``track_function`` is used to add a custom SQL function to the GraphQL schema.
Also refer a note :ref:`here <note>`.
Add an SQL function ``search_articles``:
.. code-block:: http
POST /v1/query HTTP/1.1
Content-Type: application/json
X-Hasura-Role: admin
{
"type": "track_function",
"args": {
"schema": "public",
"name": "search_articles"
}
}
.. _track_function_v2:
track_function v2
-----------------
Version 2 of ``track_function`` is used to add a custom SQL function to the GraphQL schema with configuration.
Also refer a note :ref:`here <note>`.
Add an SQL function called ``search_articles`` with a Hasura session argument.
.. code-block:: http
POST /v1/query HTTP/1.1
Content-Type: application/json
X-Hasura-Role: admin
{
"type": "track_function",
"version": 2,
"args": {
"function": {
"schema": "public",
"name": "search_articles"
},
"configuration": {
"session_argument": "hasura_session"
}
}
}
.. _track_function_args_syntax_v2:
Args syntax
^^^^^^^^^^^
.. list-table::
:header-rows: 1
* - Key
- Required
- Schema
- Description
* - function
- true
- :ref:`FunctionName <FunctionName>`
- Name of the SQL function
* - configuration
- false
- :ref:`Function Configuration <function_configuration>`
- Configuration for the SQL function
.. _function_configuration:
Function Configuration
^^^^^^^^^^^^^^^^^^^^^^
.. list-table::
:header-rows: 1
* - Key
- Required
- Schema
- Description
* - session_argument
- false
- `String`
- Function argument which accepts session info JSON
.. _note:
.. note::
Currently, only functions which satisfy the following constraints can be exposed over the GraphQL API
(*terminology from* `Postgres docs <https://www.postgresql.org/docs/current/sql-createfunction.html>`__):
- **Function behaviour**: ONLY ``STABLE`` or ``IMMUTABLE``
- **Return type**: MUST be ``SETOF <table-name>``
- **Argument modes**: ONLY ``IN``
.. _untrack_function:
untrack_function
----------------
``untrack_function`` is used to remove a SQL function from the GraphQL schema.
Remove an SQL function ``search_articles``:
.. code-block:: http
POST /v1/query HTTP/1.1
Content-Type: application/json
X-Hasura-Role: admin
{
"type": "untrack_function",
"args": {
"schema": "public",
"name": "search_articles"
}
}
.. _args_syntax:
Args syntax
^^^^^^^^^^^
.. list-table::
:header-rows: 1
* - Key
- Required
- Schema
- Description
* - table
- true
- :ref:`FunctionName <FunctionName>`
- Name of the SQL function