id,summary,reporter,owner,description,type,status,component,version,severity,resolution,keywords,cc,stage,has_patch,needs_docs,needs_tests,needs_better_patch,easy,ui_ux 12881,Unique constraint error with model inheritance while ModelForm should not validate,fgaudin,nobody,"The use case is : * ParentClass has an attribute ""name"" with unique=True * FirstSubClass inherits ParentClass * SecondSubClass inherits ParentClass With a ModelForm for each subclass, I can't create two FirstSubClasses with the same name, neither two SecondSubClasses, the form doesn't validate, what is expected. But if I create a FirstSubClass instance and try to create a SecondSubClass instance, the form validate and unique constraint error is raised by postgres. A project showing the use case with unit tests is in attachment.",,closed,"Database layer (models, ORM)",1.1,,fixed,"unique constraint, ModelForm, inheritance",,Accepted,1,0,0,0,0,0