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Contributing to dbt-snowflake

  1. About this document
  2. Getting the code
  3. Running dbt-snowflake in development
  4. Testing
  5. Updating Docs
  6. Submitting a Pull Request

About this document

This document is a guide for anyone interested in contributing to the dbt-snowflake repository. It outlines how to create issues and submit pull requests (PRs).

This is not intended as a guide for using dbt-snowflake in a project. For configuring and using this adapter, see Snowflake Profile, and Snowflake Configs.

We assume users have a Linux or MacOS system. You should have familiarity with:

  • Python virturalenvs
  • Python modules
  • pip
  • common command line utilities like git.

In addition to this guide, we highly encourage you to read the dbt-core. Almost all information there is applicable here!

Signing the CLA

Please note that all contributors to dbt-snowflake must sign the Contributor License Agreement(CLA) before their pull request(s) can be merged into the dbt-snowflake codebase. Given this, dbt-snowflake maintainers will unfortunately be unable to merge your contribution(s) until you've signed the CLA. You are, however, welcome to open issues and comment on existing ones.

Getting the code

git is needed in order to download and modify the dbt-snowflake code. There are several ways to install Git. For MacOS, we suggest installing Xcode or Xcode Command Line Tools.

External contributors

If you are not a member of the dbt-labs GitHub organization, you can contribute to dbt-snowflake by forking the dbt-snowflake repository. For more on forking, check out the GitHub docs on forking. In short, you will need to:

  1. fork the dbt-snowflake repository
  2. clone your fork locally
  3. check out a new branch for your proposed changes
  4. push changes to your fork
  5. open a pull request of your forked repository against dbt-labs/dbt-snowflake

dbt Labs contributors

If you are a member of the dbt Labs GitHub organization, you will have push access to the dbt-snowflake repo. Rather than forking dbt-snowflake to make your changes, clone the repository like normal, and check out feature branches.

Running dbt-snowflake in development

Installation

  1. Ensure you have the latest version of pip installed by running pip install --upgrade pip in terminal.

  2. Configure and activate a virtualenv as described in Setting up an environment.

  3. Install dbt-core in the active virtualenv. To confirm you installed dbt correctly, run dbt --version and which dbt.

  4. Install dbt-snowflake and development dependencies in the active virtualenv. Run pip install -e . -r dev-requirements.txt.

When dbt-snowflake is installed this way, any changes you make to the dbt-snowflake source code will be reflected immediately (i.e. in your next local dbt invocation against a Snowflake target).

Testing

Initial setup

dbt-snowflake contains unit and integration tests. Integration tests require an actual Snowflake warehouse to test against. There are two primary ways to do this:

  • This repo has CI/CD GitHub Actions set up. Both unit and integration tests will run against an already configured Snowflake warehouse during PR checks.

  • You can also run integration tests "locally" by configuring a test.env file with appropriate ENV variables.

cp test.env.example test.env
$EDITOR test.env

WARNING: The parameters in your test.env file must link to a valid Snowflake account. The test.env file you create is git-ignored, but please be extra careful to never check in credentials or other sensitive information when developing.

"Local" test commands

There are a few methods for running tests locally.

tox

tox automatically runs unit tests against several Python versions using its own virtualenvs. Run tox -p to run unit tests for Python 3.7, Python 3.8, Python 3.9, and flake8 in parallel. Run tox -e py37 to invoke tests on Python version 3.7 only (use py37, py38, or py39). Tox recipes are found in tox.ini.

pytest

You may run a specific test or group of tests using pytest directly. Activate a Python virtualenv active with dev dependencies installed. Then, run tests like so:

# Note: replace $strings with valid names

# run all snowflake integration tests in a directory
python -m pytest -m profile_snowflake tests/integration/$test_directory
# run all snowflake integration tests in a module
python -m pytest -m profile_snowflake tests/integration/$test_dir_and_filename.py
# run all snowflake integration tests in a class
python -m pytest -m profile_snowflake tests/integration/$test_dir_and_filename.py::$test_class_name
# run a specific snowflake integration test
python -m pytest -m profile_snowflake tests/integration/$test_dir_and_filename.py::$test_class_name::$test__method_name

# run all unit tests in a module
python -m pytest tests/unit/$test_file_name.py
# run a specific unit test
python -m pytest tests/unit/$test_file_name.py::$test_class_name::$test_method_name

Updating documentation

Many changes will require an update to dbt-snowflake documentation. Here are some relevant links.

  • Docs are here.
  • The docs repo for making changes is located here.
  • The changes made are likely to impact one or both of Snowflake Profile, or Snowflake Configs.
  • We ask every community member who makes a user-facing change to open an issue or PR regarding doc changes.

Submitting a Pull Request

A dbt-snowflake maintainer will review your PR and will determine if it has passed regression tests. They may suggest code revisions for style and clarity, or they may request that you add unit or integration tests. These are good things! We believe that, with a little bit of help, anyone can contribute high-quality code.

Once all tests are passing and your PR has been approved, a dbt-snowflake maintainer will merge your changes into the active development branch. And that's it! Happy developing 🎉