2
The error simply means that it is not iterable. Try to define it like this
For example
class Meta:
constraints = [models.UniqueConstraint(fields['app_uuid', 'version_code'], name='unique appversion')]
5
You need to assign iterable to the constraints. You are missing , in (models.UniqueConstraint(...),), which means you are assigning models.UniqueConstraint instance instead of tuple.
class Meta:
constraints = (models.UniqueConstraint(fields=['student', 'classroom', 'code'], name='student_classroom_code'),)
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0
Python tuples need at least one , before closing. If you dont specify this ,, the interpreter take it for a group and the type will be the var inside the parenthesis
Example:
t = ('i am a tuple',) # this is good
t = ('i am not a tuple') # this is bad
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Source:stackexchange.com