Removed datamodel-code-generator from dev requirements (#1370)

* Removed datamodel-code-generator from dev requirements

* Adapted docs to mention datamodel-code-generator not being a direct dependency

docs/source/development.rst

@@ -34,7 +34,7 @@ This workflow is valid only for the `CQL-JSON` format.
 Schema
 ^^^^^^
 
-The Common Query Language (CQL) is the part 3 of the standard OGC API - Features. This extension has its specification available at 
+The Common Query Language (CQL) is the part 3 of the standard OGC API - Features. This extension has its specification available at
 `OGC API - Features - Part 3: Filtering and the Common Query Language (CQL) <https://portal.ogc.org/files/96288>`_ and the schema exists in development at
 `cql.json <https://portal.ogc.org/files/96288#cql-json-schema>`_.
 
@@ -42,18 +42,22 @@ Model generation
 ^^^^^^^^^^^^^^^^
 
 pygeoapi uses a class-based Python model interface to translate the schema into Python objects defined by `pydantic <https://docs.pydantic.dev/>`_ models.
-The model is generated with the pre-processing of the schema through the utility ``datamodel-codegen``:
+The model is generated with the pre-processing of the schema through the utility ``datamodel-codegen``, which is part
+of the `datamodel-code-generator <https://koxudaxi.github.io/datamodel-code-generator/>`_ package:
+
 
 .. code-block:: bash
 
    # Generate from local downloaded json schema file
    datamodel-codegen  --input ~/Download/cql-schema.json --input-file-type jsonschema --output ./pygeoapi/models/cql_update.py --class-name CQLModel
 
+Note that datamodel-code-generator must be explicitly installed, as it is not a pygeoapi runtime dependency
+
 How to merge
 ^^^^^^^^^^^^
 
 Once the new pydantic models have been generated then the content of the Python file ``cql_update.py`` can be used to replace the old classes within the ``cql.py`` file.
-Update everything above the function ``get_next_node`` and then verify if the tests for the CQL are still passing, for example ``test_post_cql_json_between_query`` 
+Update everything above the function ``get_next_node`` and then verify if the tests for the CQL are still passing, for example ``test_post_cql_json_between_query``
 in ``tests/test_elasticsearch__provider.py``.
 
 Working with Spatialite on OSX

requirements-dev.txt

@@ -1,9 +1,6 @@
 # Flask-based CORS setup
 flask_cors
 
-# Generate pydantic models from json schema
-datamodel-code-generator
-
 # testing
 pytest
 pytest-cov