[Answer]-How to check object before adding 'inline = []' in Django

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1👍

✅

ModelAdmin has a method called get_inline_instances() that can be used to achieve this effect.

class TestAdmin(admin.ModelAdmin):
    def get_inline_instances(self, request, obj=None):
        if obj.id > 3:
            self.inlines = [TestInfoInline, ]
        else:
            self.inlines = []
        return super(TestAdmin, self).get_inline_instances(request, obj)

Second example – the effect remains exactly the same:

class TestAdmin(admin.ModelAdmin):
    inlines_foo = []
    inlines_bar = [TestInfoInline, ]

    def get_inline_instances(self, request, obj=None):
        self.inlines = self.inlines_foo if obj.id <= 3 else self.inlines_bar
        return super(TestAdmin, self).get_inline_instances(request, obj)
👤Ludwik Trammer

0👍

Well I think your problem is related to the issue discussed here Misleading documentation in ModelAdmin.get_inline_instances. So essentially your code should be changed to something like…
# Assuming you have a TestInfoInline inline that inherits from a BaseModelAdmin defined
# similarly to below.
class TestInfoInline(admin.StackedInline):
# Relevant stuff here…
…

class TestAdmin(admin.ModelAdmin):
   def get_inline_instances(self, request, obj=None):
      inlines = []
      if obj.id > 3:
         for inline_class in self.inlines:
            # Instanciate inline object
            inline = inline_class(self.model, self.admin_site)
            inlines.append(inline)
      return inlines

Hope this helps someone…

👤ooo

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