Allow related field to be used in filter

[Jerome-Celle]

This PR can solve: #27 , #11

This change allow filtering on related field like artiste__record_label, with a Record Label model. I added parameter_name in attribute, so we can set his value before, and it seems enough to allow the filter on related field.

Example: Filter order line with the user that is present on the order

class OrderUserFilter(CustomAutocompleteFilter):
    title = 'User'
    field_name = 'user'
    rel_model = Order
    parameter_name = 'order__user'

class OrderLineAdmin(admin.ModelAdmin):
    list_filter = (
        OrderUserFilter,
    )

[Jerome-Celle]

Hi @farhan0581 or @farhan-cashify can you check my PR? :)

[seocam]

That would be extremely helpful.

For now I'm using an ugly hack that might be help others while the feature is not released.

class OrderUserFilter(AutocompleteFilter):
    title = 'User'
    field_name = 'user'
    rel_model = Order

    @property                                                                                
    def parameter_name(self):                                                                
        return "order__user"                                                     

    @parameter_name.setter                                                                   
    def parameter_name(self, value):                                                         
        pass       

class OrderLineAdmin(admin.ModelAdmin):
    list_filter = (
        OrderUserFilter,
    )
    def lookup_allowed(self, lookup, value):                                                 
        if lookup == "order__user":                                              
            return True                                                                      
        return super().lookup_allowed(lookup, value) 

[edgarsj]

That would be extremely helpful.

Agreed. @seocam, thanks, you just saved me a working day looking for a solution.

[alcad]

sure @seocam this is a really needed feature

[filippo-20tab]

I really need this too! Thanks.

[farhan0581]

sorry guys, was a little occupied, will work on this, thanks for contribution !

[farhan0581]

Checkout the latest pypi version 0.5