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docs: update with misc 2.0 changes
- update copyright - fix typo: comparision -> comparison - add new null in comparision exp behaviour - update cloud read replica page GitOrigin-RevId: bfd322344e7ecf89a2c1361db4bc2d7e25718b98
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Rikin Kachhia
hasura-bot
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docs/_theme/djangodocs/layout.html
vendored
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docs/_theme/djangodocs/layout.html
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@ -335,7 +335,7 @@
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</div>
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<div>
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Powered by <a target="_blank" rel="noopener" href="http://www.sphinx-doc.org">Sphinx</a>.
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| Copyright © 2020 <a target="_blank" rel="noopener" href="https://hasura.io">Hasura</a>.
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| Copyright © 2021 <a target="_blank" rel="noopener" href="https://hasura.io">Hasura</a>.
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</div>
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</div>
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</div>
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@ -20,6 +20,81 @@ Hasura Cloud can load balance queries and subscriptions across read replicas whi
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Adding read replica urls
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------------------------
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.. rst-class:: api_tabs
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.. tabs::
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.. tab:: Console
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Support coming very soon
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.. tab:: CLI
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You can add read replicas for a database by adding their config to the ``/metadata/databases/database.yaml`` file:
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.. code-block:: yaml
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:emphasize-lines: 11-17
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- name: <db-name>
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kind: postgres
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configuration:
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connection_info:
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database_url:
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from_env: <DATABASE_URL_ENV>
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pool_settings:
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idle_timeout: 180
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max_connections: 50
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retries: 1
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read_replicas:
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- database_url:
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from_env: <DATABASE_REPLICA_URL_ENV>
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pool_settings:
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idle_timeout: 180
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max_connections: 50
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retries: 1
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Apply the metadata by running:
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.. code-block:: yaml
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hasura metadata apply
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.. tab:: API
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Currently it is only possible to add read replicas for a database at the time of creation using the :ref:`pg_add_source metadata API <pg_add_source>`
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.. code-block:: http
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:emphasize-lines: 15-26
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POST /v1/metadata HTTP/1.1
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Content-Type: application/json
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X-Hasura-Role: admin
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{
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"type": "pg_add_source",
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"args": {
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"name": "<db_name>",
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"configuration": {
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"connection_info": {
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"database_url": {
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"from_env": "<DATABASE_URL_ENV>"
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}
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},
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"read_replicas": [
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{
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"database_url": {
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"from_env": "<DATABASE_REPLICA_URL_ENV>"
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},
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"pool_settings": {
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"retries": 1,
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"idle_timeout": 180,
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"max_connections": 50
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}
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}
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]
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}
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.. admonition:: For existing v1.3 projects
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If you have configured your Postgres instances with replicas, the replica URLs can be added to Hasura using the following environment variable in your project ENV Vars tab:
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.. code-block:: bash
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@ -28,14 +103,7 @@ If you have configured your Postgres instances with replicas, the replica URLs c
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If you have multiple replicas, their urls can be added as comma separated values.
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Connection pool parameters
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--------------------------
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Additional environment variables for connection pools, and for read replicas specifically:
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``HASURA_GRAPHQL_PG_STRIPES``
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``HASURA_GRAPHQL_PG_CONNECTIONS``
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Additional environment variables for read replicas specifically:
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``HASURA_GRAPHQL_CONNECTIONS_PER_READ_REPLICA``
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@ -81,7 +81,7 @@ engine instance via the console / metadata APIs / CLI:
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.. code-block:: http
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POST /v2/metadata HTTP/1.1
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POST /v1/metadata HTTP/1.1
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Content-Type: application/json
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X-Hasura-Role: admin
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@ -93,6 +93,11 @@ engine instance via the console / metadata APIs / CLI:
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"connection_info": {
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"database_url": {
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"from_env": "<DB_URL_ENV_VAR>"
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},
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"pool_settings": {
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"retries": 1,
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"idle_timeout": 180,
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"max_connections": 50
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}
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}
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}
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@ -57,10 +57,10 @@ argument to filter on equality.
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You can see the complete specification of the ``where`` argument in the :ref:`API reference <WhereExp>`.
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Comparision operators
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---------------------
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Comparison operators
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--------------------
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Let’s take a look at different comparision operators that can be used to filter results.
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Let’s take a look at different comparison operators that can be used to filter results.
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Equality operators (_eq, _neq)
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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@ -1267,7 +1267,7 @@ For example:
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}
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}
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The behaviour of the comparision operators depends on whether the nested objects are a single object related via an
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The behaviour of the comparison operators depends on whether the nested objects are a single object related via an
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object relationship or an array of objects related via an array relationship.
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- In case of an **object relationship**, a row will be returned if the single nested object satisfies the defined
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@ -1826,10 +1826,17 @@ The expression ``{}`` evaluates to ``true`` if an object exists (even if it's ``
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.. _null_value_evaluation:
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Evaluation of **null** values in comparision expressions
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--------------------------------------------------------
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Evaluation of **null** values in comparison expressions
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-------------------------------------------------------
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If in any comparision expression a ``null`` (or ``undefined``) value is passed, the expression currently gets
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reduced to ``{}`` (:ref:`TRUE expression <true_expression>`)
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In **versions v2.0.0 and above**, if in any comparison expression a ``null`` value is passed, a type mismatch error
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will be thrown.
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**For example**, the expression ``{ where: { _eq: null } }`` will be reduced to ``{ where: {} }``
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For example, the expression ``{ where: {id: { _eq: null }}}`` will throw an error.
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In **versions v1.3.3 and below**, if in any comparison expression a ``null`` value is passed, the expression gets
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reduced to ``{}``, the :ref:`TRUE expression <true_expression>`.
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For example, the expression ``{ where: { id: {_eq: null }}}`` will be reduced to ``{ where: {id: {}} }`` which
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will return all objects for which an ``id`` is set, i.e. all objects will be returned.
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