.. meta::
   :description: Hasura action examples
   :keywords: hasura, docs, actions, examples

.. _action_examples:

Action examples
===============

.. contents:: Table of contents
  :backlinks: none
  :depth: 1
  :local:

Introduction
------------

This page provides reference examples of typical action use cases.

..
  Relationships
  -------------

  Object relationship from an action
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  Let's say we have the following two tables in our schema:

  .. code-block:: sql

      authors (id int, name text, is_active boolean, rating int, address_id)

      addresses (id int, street text, zip text, city text)

  Now we have an action ``updateAddress`` that looks as follows:

  .. thumbnail:: /img/graphql/core/actions/update-address-action-definition.png
         :alt: Update address action
         :width: 65%

  We can now add an object relationship from the ``updateAddress`` action to the ``authors`` table in our schema.
  We call it ``updatedAddressAuthor``.

  .. thumbnail:: /img/graphql/core/actions/action-object-relationship.png
         :alt: Object relationship from action
         :width: 65%

  It's now possible to return the author from the ``updateAddress`` action through the newly created relationship:

  .. graphiql::
    :view_only:
    :query:
      mutation {
        updateAddress(address:
          {
            id: 1
            street: "New York Avenue"
            zip: "98000"
            city: "New Orleans"
          }
        ) {
            id
            updatedAddressAuthor {
              name
            }
          }
      }
    :response:
      {
        "data": {
          "updateAddress": {
            "id": 1,
            "updatedAddressAuthor": {
              "name": "J.K. Rowling"
            }
          }
        }
      }

  Array relationship from an action
  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

  Let's say we have the following two tables in our schema:

  .. code-block:: sql

      authors (id int, name text, is_active boolean, rating int)

      articles (id int, title text, content text, author_id int)

  Now we have an action ``updateAuthor`` that looks as follows:

  .. thumbnail:: /img/graphql/core/actions/update-author-action-definition.png
         :alt: Update author action
         :width: 65%

  We can now add an array relationship from the ``updateAuthor`` action to the ``articles`` table in our schema.
  We call it ``updatedAuthorArticles``.

  .. thumbnail:: /img/graphql/core/actions/action-array-relationship.png
         :alt: Array relationship from action
         :width: 65%

  It's now possible to return articles from the ``updateAuthor`` action through the newly created relationship:

  .. graphiql::
    :view_only:
    :query:
      mutation {
        updateAuthor(author:
          {
            id: 442,
            name: "Joanne K. Rowling",
            is_active: true,
            rating: 10
          }
        ) {
            id
            updatedAuthorArticles {
              title
            }
          }
      }
    :response:
      {
        "data": {
          "updateAuthor": {
            "id": 442,
            "updatedAuthorArticles": [
              {
                  "title": "Harry Potter and the Philosopher's Stone"
              },
              {
                  "title": "Harry Potter and the Chamber of Secrets"
              }
            ]
          }
        }
      }