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158 lines
5.2 KiB
ReStructuredText
158 lines
5.2 KiB
ReStructuredText
.. meta::
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:description: Manage Hasura metadata
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:keywords: hasura, docs, metadata
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.. _manage_hasura_metadata:
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Managing Hasura metadata
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========================
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.. contents:: Table of contents
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:backlinks: none
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:depth: 1
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:local:
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Introduction
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------------
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If your Postgres schema is already managed with a tool like knex, TypeORM,
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Django/Rails migrations, you will still need a way to export the actions you
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performed on the Hasura console to apply it later on another Hasura instance.
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All the actions performed on the console, like tracking tables/views/functions,
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creating relationships, configuring permissions, creating event triggers and remote
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schemas, etc. can be exported as a JSON/yaml metadata file which can be version
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controlled. The metadata file can be later imported to another Hasura instance to get the same
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configuration. You can also manually edit the metadata file to add more objects to
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it and then use it to update the instance.
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Exporting Hasura metadata
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-------------------------
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.. rst-class:: api_tabs
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.. tabs::
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.. tab:: CLI
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Metadata can be exported with the :ref:`hasura metadata export <hasura_metadata_export>`
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command.
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This will export the metadata as yaml files in the ``/metadata`` directory
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.. tab:: Console
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1. Click on the settings (⚙) icon at the top right corner of the console screen.
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2. In the Hasura metadata actions page that opens, click on the ``Export Metadata`` button.
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3. This will prompt a file download for ``hasura_metadata_<timestamp>.json``. Save the file.
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.. tab:: API
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The export can be done via the :ref:`Metadata API
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<api_manage_metadata>`.
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Response will be a JSON object with the Hasura metadata. Here is an example
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using ``curl`` to save this as a file:
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.. code-block:: bash
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curl -d'{"type": "export_metadata", "args": {}}' http://localhost:8080/v1/query -o hasura_metadata.json
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This command will create a ``hasura_metadata.json`` file.
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If an admin secret is set, add ``-H 'X-Hasura-Admin-Secret: <your-admin-secret>'`` as the API is an
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admin-only API.
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Applying/Importing Hasura metadata
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----------------------------------
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You can apply exported metadata from one Hasura GraphQL engine instance to another. You can also apply an older or
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modified version of an instance's metadata onto itself.
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Importing completely replaces the metadata on that instance, i.e. you lose any metadata that was already present
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before.
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.. rst-class:: api_tabs
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.. tabs::
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.. tab:: CLI
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Metadata can be applied with the :ref:`hasura metadata apply <hasura_metadata_apply>`
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command.
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.. tab:: Console
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1. Click on the settings (⚙) icon at the top right corner of the console screen.
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2. Click on ``Import Metadata`` button.
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3. Choose a ``hasura_metadata.json`` file that was exported earlier.
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4. A notification should appear indicating the success or error.
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.. tab:: API
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The exported JSON can be imported via the :ref:`Metadata API
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<api_manage_metadata>`.
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Here is an example using ``curl``:
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.. code-block:: bash
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curl -d'{"type":"replace_metadata", "args":'$(cat hasura_metadata.json)'}' http://localhost:8080/v1/query
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This command reads the ``hasura_metadata.json`` file and makes a POST request to
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replace the metadata.
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If an admin secret is set, add ``-H 'X-Hasura-Admin-Secret: <your-admin-secret>'`` as the API is an
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admin-only API.
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.. note::
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All the dependent objects, like tables, views, functions etc. should exist on
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Postgres before importing the metadata. Otherwise, it will result in an error
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saying the object does not exist. So, apply the Postgres schema first, before
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importing the metadata.
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.. _reload_metadata_manual:
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Reloading Hasura metadata
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-------------------------
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In some cases, the metadata can be out of sync with the Postgres schema. For example,
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when a new column has been added to a table via an external tool such as ``psql``.
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.. rst-class:: api_tabs
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.. tabs::
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.. tab:: CLI
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Metadata can be reloaded with the :ref:`hasura metadata reload <hasura_metadata_reload>`
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command.
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.. tab:: Console
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1. Click on the settings (⚙) icon at the top right corner of the console screen.
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2. Click on ``Reload`` button.
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3. A notification should appear indicating the success.
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.. tab:: API
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The reload of metadata can be done via the :ref:`Metadata API
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<api_manage_metadata>`.
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Here is an example using ``curl``:
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.. code-block:: bash
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curl -d'{"type": "reload_metadata", "args": {}}' http://localhost:8080/v1/query
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If an admin secret is set, add ``-H 'X-Hasura-Admin-Secret: <your-admin-secret>'`` as the API is an
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admin-only API.
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.. note::
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Reloading may result in inconsistent metadata status. You may need to resolve
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all inconsistent objects manually or delete them. After that, you need to reload
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metadata again.
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Managing Hasura metadata in CI/CD
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---------------------------------
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In case you need an automated way of applying/importing the metadata, take a
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look at the :ref:`cli-migrations <auto_apply_migrations>` Docker image, which
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can start the GraphQL engine after automatically importing a mounted metadata
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directory.
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