db-changes-var1.yaml

name: Auto DB Migration

on:
  pull_request:
    branches:
      - main

jobs:
  check-sql-schema-changes:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Branch
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Check For Changes
        id: changed-db-files
        uses: tj-actions/changed-files@v45
        with:
          files: "app/**"

      - name: Determine Outcome
        id: determine-outcome
        run: |
          set -ex
          echo "DB_CHANGE=${{ steps.changed-db-files.outputs.any_changed }}" >> $GITHUB_ENV
          echo "DB_CHANGE=${{ steps.changed-db-files.outputs.any_changed }}" >> $GITHUB_OUTPUT

  run-alembic:
    needs: check-sql-schema-changes
    if: needs.check-sql-schema-changes.outputs.DB_CHANGE == 'true'
    runs-on: ubuntu-latest

    services:
      postgres:
        image: postgis/postgis:14-3.4
        env:
          POSTGRES_PASSWORD: postgres
          POSTGRES_USER: postgres
          POSTGRES_HOST: localhost
          POSTGRES_DRIVERNAME: postgresql
        options: >-
          --health-cmd pg_isready
          --health-interval 5s
          --health-timeout 5s
          --health-retries 5
        ports:
          - 5432:5432

    steps:
      - name: Drop unwanted PostGIS extensions
        run: |
          psql -h localhost -U postgres -d postgres -c "DROP EXTENSION IF EXISTS postgis_tiger_geocoder CASCADE;"
          psql -h localhost -U postgres -d postgres -c "DROP EXTENSION IF EXISTS postgis_topology CASCADE;"
          psql -h localhost -U postgres -d postgres -c "DROP EXTENSION IF EXISTS fuzzystrmatch CASCADE;"

        env:
          PGPASSWORD: postgres

      - name: Checkout Main Branch
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: 'main'

      - name: Set up Python
        id: setup-python
        uses: actions/setup-python@v5
        with:
          python-version: '3.11'

      - name: Generate envs & set path
        id: generate-envs
        run: |
          DATABASE_URL="postgresql://postgres:postgres@localhost:5432"
          echo "DATABASE_URL=$DATABASE_URL" >> $GITHUB_ENV
          echo "PYTHONPATH=$PYTHONPATH:$(pwd)" >> $GITHUB_ENV

      - name: Install dependencies
        id: install-dependencies
        run: |
          python -m pip install --upgrade pip
          pip install -r app/requirements.txt

      - name: Alembic Upgrade Head
        id: run-alembic-upgrade-initial
        env:
          DATABASE_URL: ${{ env.DATABASE_URL }}
        run: |
          alembic -c alembic.ini upgrade head

      - name: Test DB is set up correctly on init
        id: test-db-set-up-init
        run: |
          set -e # catch errors
          python migrations/test_migration.py

      - name: Checkout New Branch
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: 'add-gha-auto-db-migration'

      - name: Fetch Main Branch
        run: |
          git fetch origin main  # Fetch the latest changes from main
          git merge origin/main   # Merge main branch into current branch

      - name: Generate alembic script for new branch
        id: run-alembic-script-autogen-round-2
        env:
          DATABASE_URL: ${{ env.DATABASE_URL }}
        run: |
          alembic -c alembic.ini revision --autogenerate -m "test_002"
          cat migrations/versions/test_002.py

      - name: Upgrade alembic head with new revision
        id: run-alembic-upgrade-new
        env:
          DATABASE_URL: ${{ env.DATABASE_URL }}
        run: |
          alembic -c alembic.ini upgrade head

      - name: Test DB is still set up correctly
        id: test-db-set-up
        run: |
          set -e # catch errors
          python migrations/test_migration.py


      - name: Confirm schema is correct
        run: |
          psql -h localhost -U postgres -d postgres -c "\dt public.*"
          psql -h localhost -U postgres -d postgres -c "\dt gps.*"
        env:
          PGPASSWORD: postgres

      - name: Add new alembic script to PR
        id: add-alembic-script-to-new-branch
        uses: stefanzweifel/git-auto-commit-action@v5