python data_error ai_generated true

django.db.utils.IntegrityError: NOT NULL constraint failed: app_model.field

ID: python/django-model-save-error

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-07-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

Attempting to save a model instance with a required field set to NULL.

generic

中文

尝试保存模型实例时，必填字段设置为NULL。

Workarounds

  1. 95% success Provide a default value or set the field before save 
    instance.field = value; instance.save()
  2. 90% success Allow NULL in model definition 
    field = models.CharField(null=True, blank=True)

Dead Ends

Common approaches that don't work:

  1. Setting field to empty string 70% fail

    Empty string is not NULL but may still violate constraints if blank=False.

  2. Ignoring the field 90% fail

    Field must have a value.