python - if form field is None don't find in model in that field -

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i have model blank=true fields. in form have fields optional if in model blank=true. so, if in form want make them empty, , want filter model objects, don't want use empty fields search. need create other query in case?

forms.py

class searchgoods(forms.form):     region_from = forms.modelchoicefield(required=false, queryset = region.objects.all(), widget = forms.select())     region_to = forms.modelchoicefield(required=false, queryset = region.objects.all(), widget = forms.select())

models.py

class add_good(models.model):     loading_region = models.foreignkey(region, blank=true, related_name="loading_region", null=true)      unloading_region = models.foreignkey(region, blank=true, related_name="unloading_region", null=true)

views.py

if form['region_from'] == none:             if form['region_to'] == none:                 data_from_db = add_good.objects.filter(loading_country=form['country_from'],                                                unloading_country=form['country_to'],                                                 loading_city=form['city_from'],                                                unloading_city=form['city_to'],                                                 loading_goods_date_from__gte=form['date_from'],                                                loading_goods_date_to__lte=form['date_to'],                                                 mass__gte=form["mass_from"],                                                mass__lte=form["mass_to"],                                                 volume__gte=form['volume_from'],                                                volume__lte=form['volume_to'],                                                 auto_current_type__in=auto_types,                                                )             else:                 data_from_db = add_good.objects.filter(loading_country=form['country_from'],                                                        unloading_country=form['country_to'],                                                         loading_city=form['city_from'],                                                        unloading_city=form['city_to'],                                                         unloading_region=form["region_to"],                                                         loading_goods_date_from__gte=form['date_from'],                                                        loading_goods_date_to__lte=form['date_to'],                                                         mass__gte=form["mass_from"],                                                        mass__lte=form["mass_to"],                                                         volume__gte=form['volume_from'],                                                        volume__lte=form['volume_to'],                                                         auto_current_type__in=auto_types,                                                        )          else:             if form['region_to'] == none:                 data_from_db = add_good.objects.filter(loading_country=form['country_from'],                                                    unloading_country=form['country_to'],                                                     loading_city=form['city_from'],                                                    unloading_city=form['city_to'],                                                     loading_region=form["region_from"],                                                     loading_goods_date_from__gte=form['date_from'],                                                    loading_goods_date_to__lte=form['date_to'],                                                     mass__gte=form["mass_from"],                                                    mass__lte=form["mass_to"],                                                     volume__gte=form['volume_from'],                                                    volume__lte=form['volume_to'],                                                     auto_current_type__in=auto_types,                                                    )             else:                 data_from_db = add_good.objects.filter(loading_country=form['country_from'],                                                        unloading_country=form['country_to'],                                                         loading_city=form['city_from'],                                                        unloading_city=form['city_to'],                                                         loading_region=form["region_from"],                                                        unloading_region=form["region_to"],                                                         loading_goods_date_from__gte=form['date_from'],                                                        loading_goods_date_to__lte=form['date_to'],                                                         mass__gte=form["mass_from"],                                                        mass__lte=form["mass_to"],                                                         volume__gte=form['volume_from'],                                                        volume__lte=form['volume_to'],                                                         auto_current_type__in=auto_types,                                                        )

well, exactly, in models there more fields, of them can see in views when save them

the situation forget makemigrations. after works fine!


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