PEDSnet Common Data Model Definitions
A python app for CDM model classes and DDL autogeneration.
The pedsnetcdms app creates python-importable sqlalchemy AND django style models for PEDSnet, Vocab, I2B2, and PCORnet CDMs. In addition, alembic AND django migrations can be created from those models. The alembic migrations can be used to auto-generate DDL files for all four CDMs.
The pedsnetcdms app is based on the declarative definition of models in JSON format (found in the models.json files) and the dynamic generation of python classes from those models (found in the dj_makers.py and sa_makers.py files). The generating functions are used in each CDM’s models.py and sa_models.py files to put the model classes where the ORMs can find them. The settings.py, alembic.ini, and alembic/env.py files are simply ORM module configuration.
A pip install pedsnetcdms should get you the package with the generated models and migrations ready for import into your python environment.
However, if you want to generate the DDLs yourself or use the migrations directly on your database, you will have to clone the repository and install some or all of the following python packages and their (in some cases non-Python) dependencies, depending on which DBMS you are using:
This is left as an exercise for the reader. (Although perhaps a Dockerfile is in order…PR anyone?)
## DDL Files
DDL files for all four CDMs in PostgreSQL, Oracle, SQL Server, and MySQL dialects are available in the pedsnetcdms/ddloutput directory. They are hypothetical, so please test them and post an issue if you find a problem.
## Model Usage
Django models are available at pedsnetcdms.<CDM>.models and sqlalchemy models are available at pedsnetcdms.<CDM>.sa_models, where <CDM> should be replaced with one of the following:
You can also include any of these apps in your django INSTALLED_APPS setting.
## DDL Generation
In order to generate the DDL, install the required package(s) for your DBMS(s) from the list above, clone the repository and install the package.
Edit the pedsnetcdms/<CDM>/alembic/env.py file for your desired CDMs to restrict the DBMSs for which DDL will be output (hint: the iterated list of tuples inside the run_migrations_offline function).
From within the pedsnetcdms package directory (where the alembic.ini file is), run alembic -n <CDM> upgrade head –sql and watch your DDL files appear!
## Direct Migration Use
Install requirements, clone, and install the package as above.
Edit the alembic.ini or settings.py files to specify the database URI you wish to connect to (notice that the setting is repeated under each CDMs section in alembic.ini).
Run alembic -n <CDM> upgrade head or python manage.py migrate <CDM>.
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