问题
I have a model that I want staff to be able to edit up to the date for the event. Like this:
class ThingAdmin(admin.ModelAdmin):
model = Thing
if obj.date < today: #Something like that
inlines = [MyInline,]
The problem is, I don't have access to the obj instance at this level. I've tried overriding get_formset(), but didn't get anywhere.
Please advise?
回答1:
Thanks to the comments for a change in 1.4. My implementation here wasn't thread safe either, so it really should have been deleted.
Since get_formsets is passed the object and calls get_inline_instances, we can modify both functions to act on the object.
This should work:
class ThingAdmin(admin.ModelAdmin):
model = Thing
inlines = [inline]
other_set_of_inlines = [other_inline]
def get_inline_instances(self, request, obj=None):
# ^^^ this is new
inline_instances = []
if obj.date > datetime.date(2012, 1, 1):
inlines = self.inlines
else:
inlines = self.other_set_of_inlines
for inline_class in inlines:
inline = inline_class(self.model, self.admin_site)
if request:
if not (inline.has_add_permission(request) or
inline.has_change_permission(request) or
inline.has_delete_permission(request)):
continue
if not inline.has_add_permission(request):
inline.max_num = 0
inline_instances.append(inline)
return inline_instances
def get_formsets(self, request, obj=None):
for inline in self.get_inline_instances(request, obj):
# ^^^^^ this is new
yield inline.get_formset(request, obj)
回答2:
I had a complex case where the solutions I tried failed in unexpected ways (problems with readonly fields in inlines). This is the most clear and failsafe way I've found:
class MyAdmin(admin.ModelAdmin):
def add_view(self, request, form_url='', extra_context=None):
self.inlines = [InlineA, InlineC]
return super(MyAdmin, self).add_view(request, form_url, extra_context)
def change_view(self, request, object_id, form_url='', extra_context=None):
self.inlines = [InlineB, InlineC, InlineD]
return super(MyAdmin, self).change_view(request, object_id, form_url, extra_context)
This is working in Django 1.4.x.
回答3:
As of Django 2.2.2 (current latest version as of this writing), I would use the solution provided earlier by @aggieNick02, which is to override get_inline_instances shown below.
class ThingAdmin(models.ModelAdmin):
inlines = [MyInline,]
def get_inline_instances(self, request, obj=None):
if not obj or obj.date >= today: return []
return super(ThingAdmin, self).get_inline_instances(request, obj)
I'm posting this new answer because as of April 17th, 2019 in this commit, it looks like the future recommended way to do this would be to instead override the get_inlines method. So in later versions, the solution to this could look like the code below, which allows you to specify different sets of inlines and use them based on a condition.
class ThingAdmin(admin.ModelAdmin):
model = Thing
inlines = [inline]
other_set_of_inlines = [other_inline]
def get_inlines(self, request, obj):
if obj.date > datetime.date(2012, 1, 1):
return self.inlines
else:
return self.other_set_of_inlines
回答4:
In recent version of Django, you'll need to override ModelAdmin.get_formsets. e.g.
class MyAdmin(admin.ModelAdmin):
def get_formsets(self, request, obj=None):
if obj:
for _ in super(MyAdmin, self).get_formsets(request, obj):
yield _
else:
for inline in self.get_specific_inlines(request):
yield inline.get_formset(request, obj)
回答5:
I think the best answer is in the django documentation: https://docs.djangoproject.com/en/1.9/ref/contrib/admin/
Search for "get_inline_instances" The example provided is very good and the nuances of the call are described in detail.
回答6:
I had a situation where I needed to show an Inline based on the admin site that you were on for a given story.
I was able to get dynamic inlines working for Django 1.3 using the following code:
In highlights/admin.py
class HighlightInline(generic.GenericTabularInline):
model = Highlight
extra = 1
max_num = 4
fields = ('order', 'highlight')
template = 'admin/highlights/inline.html'
class HighlightAdmin(admin.ModelAdmin):
def regulate_highlight_inlines(self):
highlights_enabled = Setting.objects.get_or_default('highlights_enabled', default='')
highlight_inline_instance = HighlightInline(self.model, self.admin_site)
highlight_found = any(isinstance(x, HighlightInline) for x in self.inline_instances)
if highlights_enabled.strip().lower() == 'true':
if not highlight_found:
self.inline_instances.insert(0, highlight_inline_instance)
else:
if highlight_found:
self.inline_instances.pop(0)
print self.inline_instances
def change_view(self, request, object_id, form_url='', extra_context=None):
self.regulate_highlight_inlines()
return super(HighlightAdmin, self).change_view(request, object_id)
def add_view(self, request, form_url='', extra_context=None):
self.regulate_highlight_inlines()
return super(HighlightAdmin, self).add_view(request, form_url, extra_context)
In story/admin.py
class StoryAdmin(HighlightAdmin):
One thing to note is that I'm not merely manipulating inline classes(HighlightInline) but rather, I'm changing inline instances(HighlightInline(self.model, self.admin_site)). This is because django has already constructed a list of inline instances based on a list of inline classes during the initial construction of the admin class.
回答7:
I think the easiest way to hack this is to call your custom funciton in get_fields, or get_fieldsets and so on, just set self.inlines in a custom function.
class XXXAdmin(admin.ModelAdmin):
def set_inlines(self, request, obj):
""" hack inlines models according current request.user or obj """
self.inlines = []
if request.user.is_superuser or request.user is obj.recorder:
self.inlines = [AbcInline, ]
def get_fields(self, request, obj=None):
self.set_inlines(request, obj) # NOTICE this line
super(XXXAdmin, self).get_fields(request, obj)
回答8:
The most turnkey way to do this now is to override and super call to get_inline_instances.
class ThingAdmin(models.ModelAdmin):
inlines = [MyInline,]
def get_inline_instances(self, request, obj=None):
unfiltered = super(ThingAdmin, self).get_inline_instances(request, obj)
#filter out the Inlines you don't want
keep_myinline = obj and obj.date < today
return [x for x in unfiltered if not isinstance(x,MyInline) or keep_myinline]
This puts MyInline in when you want it and not when you don't. If you know the only inline you have in your class is MyInline, you can make it even simpler:
class ThingAdmin(models.ModelAdmin):
inlines = [MyInline,]
def get_inline_instances(self, request, obj=None):
if not obj or obj.date >= today:
return []
return super(ThingAdmin, self).get_inline_instances(request, obj)
来源：https://stackoverflow.com/questions/5411565/making-inlines-conditional-in-the-django-admin