rules:
- id: nontext-field-must-set-null-true
  patterns:
  - pattern-inside: |
      class $M(...):
        ...
  - pattern-not: $F = django.db.models.CharField(...)
  - pattern-not: $F = django.db.models.TextField(...)
  - pattern-not: $F = django.db.models.SlugField(...)
  - pattern-not: $F = django.db.models.EmailField(...)
  - pattern-not: $F = django.db.models.FileField(...)
  - pattern-not: $F = django.db.models.ImageField(...)
  - pattern-not: $F = django.db.models.URLField(...)
  - pattern-not: $F = django.db.models.UUIDField(...)
  - pattern-not: $F = django.db.models.ManyToManyField(...)
  - pattern-not: $F = django.db.models.NullBooleanField(...)
  - pattern-not: $F = $X(..., null=True, blank=True, ...)
  - pattern: $F = $X(..., blank=True, ...)
  message: null=True should be set if blank=True is set on non-text fields.
  languages: [python]
  severity: ERROR
  metadata:
    category: correctness
    technology:
    - django