rules:
  - id: use-decimalfield-for-money
    patterns:
      - pattern-inside: |
          class $M(...):
            ...
      - pattern: $F = django.db.models.FloatField(...)
      - metavariable-regex:
          metavariable: $F
          regex: .*([pP][rR][iI][cC][eE]|[aA][mM][oO][uU][nN][tT]|[sS][uU][bB][tT][oO][tT][aA][lL]|[dD][oO][nN][aA][tT][iI][oO][nN]|[fF][eE][eE]|[sS][aA][lL][aA][rR][yY]|[pP][rR][eE][cC][iI][oO]).*
    message: Found a FloatField used for variable $F. Use DecimalField for currency fields to avoid float-rounding errors.
    languages: [python]
    severity: ERROR
    metadata:
      category: correctness
      technology:
        - django