| """ |
| FilterSpec encapsulates the logic for displaying filters in the Django admin. |
| Filters are specified in models with the "list_filter" option. |
| |
| Each filter subclass knows how to display a filter for a field that passes a |
| certain test -- e.g. being a DateField or ForeignKey. |
| """ |
| |
| from django.db import models |
| from django.utils.encoding import smart_unicode, iri_to_uri |
| from django.utils.translation import ugettext as _ |
| from django.utils.html import escape |
| from django.utils.safestring import mark_safe |
| import datetime |
| |
| class FilterSpec(object): |
| filter_specs = [] |
| def __init__(self, f, request, params, model, model_admin): |
| self.field = f |
| self.params = params |
| |
| def register(cls, test, factory): |
| cls.filter_specs.append((test, factory)) |
| register = classmethod(register) |
| |
| def create(cls, f, request, params, model, model_admin): |
| for test, factory in cls.filter_specs: |
| if test(f): |
| return factory(f, request, params, model, model_admin) |
| create = classmethod(create) |
| |
| def has_output(self): |
| return True |
| |
| def choices(self, cl): |
| raise NotImplementedError() |
| |
| def title(self): |
| return self.field.verbose_name |
| |
| def output(self, cl): |
| t = [] |
| if self.has_output(): |
| t.append(_(u'<h3>By %s:</h3>\n<ul>\n') % escape(self.title())) |
| |
| for choice in self.choices(cl): |
| t.append(u'<li%s><a href="%s">%s</a></li>\n' % \ |
| ((choice['selected'] and ' class="selected"' or ''), |
| iri_to_uri(choice['query_string']), |
| choice['display'])) |
| t.append('</ul>\n\n') |
| return mark_safe("".join(t)) |
| |
| class RelatedFilterSpec(FilterSpec): |
| def __init__(self, f, request, params, model, model_admin): |
| super(RelatedFilterSpec, self).__init__(f, request, params, model, model_admin) |
| if isinstance(f, models.ManyToManyField): |
| self.lookup_title = f.rel.to._meta.verbose_name |
| else: |
| self.lookup_title = f.verbose_name |
| self.lookup_kwarg = '%s__%s__exact' % (f.name, f.rel.to._meta.pk.name) |
| self.lookup_val = request.GET.get(self.lookup_kwarg, None) |
| self.lookup_choices = f.rel.to._default_manager.all() |
| |
| def has_output(self): |
| return len(self.lookup_choices) > 1 |
| |
| def title(self): |
| return self.lookup_title |
| |
| def choices(self, cl): |
| yield {'selected': self.lookup_val is None, |
| 'query_string': cl.get_query_string({}, [self.lookup_kwarg]), |
| 'display': _('All')} |
| for val in self.lookup_choices: |
| pk_val = getattr(val, self.field.rel.to._meta.pk.attname) |
| yield {'selected': self.lookup_val == smart_unicode(pk_val), |
| 'query_string': cl.get_query_string({self.lookup_kwarg: pk_val}), |
| 'display': val} |
| |
| FilterSpec.register(lambda f: bool(f.rel), RelatedFilterSpec) |
| |
| class ChoicesFilterSpec(FilterSpec): |
| def __init__(self, f, request, params, model, model_admin): |
| super(ChoicesFilterSpec, self).__init__(f, request, params, model, model_admin) |
| self.lookup_kwarg = '%s__exact' % f.name |
| self.lookup_val = request.GET.get(self.lookup_kwarg, None) |
| |
| def choices(self, cl): |
| yield {'selected': self.lookup_val is None, |
| 'query_string': cl.get_query_string({}, [self.lookup_kwarg]), |
| 'display': _('All')} |
| for k, v in self.field.choices: |
| yield {'selected': smart_unicode(k) == self.lookup_val, |
| 'query_string': cl.get_query_string({self.lookup_kwarg: k}), |
| 'display': v} |
| |
| FilterSpec.register(lambda f: bool(f.choices), ChoicesFilterSpec) |
| |
| class DateFieldFilterSpec(FilterSpec): |
| def __init__(self, f, request, params, model, model_admin): |
| super(DateFieldFilterSpec, self).__init__(f, request, params, model, model_admin) |
| |
| self.field_generic = '%s__' % self.field.name |
| |
| self.date_params = dict([(k, v) for k, v in params.items() if k.startswith(self.field_generic)]) |
| |
| today = datetime.date.today() |
| one_week_ago = today - datetime.timedelta(days=7) |
| today_str = isinstance(self.field, models.DateTimeField) and today.strftime('%Y-%m-%d 23:59:59') or today.strftime('%Y-%m-%d') |
| |
| self.links = ( |
| (_('Any date'), {}), |
| (_('Today'), {'%s__year' % self.field.name: str(today.year), |
| '%s__month' % self.field.name: str(today.month), |
| '%s__day' % self.field.name: str(today.day)}), |
| (_('Past 7 days'), {'%s__gte' % self.field.name: one_week_ago.strftime('%Y-%m-%d'), |
| '%s__lte' % f.name: today_str}), |
| (_('This month'), {'%s__year' % self.field.name: str(today.year), |
| '%s__month' % f.name: str(today.month)}), |
| (_('This year'), {'%s__year' % self.field.name: str(today.year)}) |
| ) |
| |
| def title(self): |
| return self.field.verbose_name |
| |
| def choices(self, cl): |
| for title, param_dict in self.links: |
| yield {'selected': self.date_params == param_dict, |
| 'query_string': cl.get_query_string(param_dict, [self.field_generic]), |
| 'display': title} |
| |
| FilterSpec.register(lambda f: isinstance(f, models.DateField), DateFieldFilterSpec) |
| |
| class BooleanFieldFilterSpec(FilterSpec): |
| def __init__(self, f, request, params, model, model_admin): |
| super(BooleanFieldFilterSpec, self).__init__(f, request, params, model, model_admin) |
| self.lookup_kwarg = '%s__exact' % f.name |
| self.lookup_kwarg2 = '%s__isnull' % f.name |
| self.lookup_val = request.GET.get(self.lookup_kwarg, None) |
| self.lookup_val2 = request.GET.get(self.lookup_kwarg2, None) |
| |
| def title(self): |
| return self.field.verbose_name |
| |
| def choices(self, cl): |
| for k, v in ((_('All'), None), (_('Yes'), '1'), (_('No'), '0')): |
| yield {'selected': self.lookup_val == v and not self.lookup_val2, |
| 'query_string': cl.get_query_string({self.lookup_kwarg: v}, [self.lookup_kwarg2]), |
| 'display': k} |
| if isinstance(self.field, models.NullBooleanField): |
| yield {'selected': self.lookup_val2 == 'True', |
| 'query_string': cl.get_query_string({self.lookup_kwarg2: 'True'}, [self.lookup_kwarg]), |
| 'display': _('Unknown')} |
| |
| FilterSpec.register(lambda f: isinstance(f, models.BooleanField) or isinstance(f, models.NullBooleanField), BooleanFieldFilterSpec) |
| |
| # This should be registered last, because it's a last resort. For example, |
| # if a field is eligible to use the BooleanFieldFilterSpec, that'd be much |
| # more appropriate, and the AllValuesFilterSpec won't get used for it. |
| class AllValuesFilterSpec(FilterSpec): |
| def __init__(self, f, request, params, model, model_admin): |
| super(AllValuesFilterSpec, self).__init__(f, request, params, model, model_admin) |
| self.lookup_val = request.GET.get(f.name, None) |
| self.lookup_choices = model_admin.queryset(request).distinct().order_by(f.name).values(f.name) |
| |
| def title(self): |
| return self.field.verbose_name |
| |
| def choices(self, cl): |
| yield {'selected': self.lookup_val is None, |
| 'query_string': cl.get_query_string({}, [self.field.name]), |
| 'display': _('All')} |
| for val in self.lookup_choices: |
| val = smart_unicode(val[self.field.name]) |
| yield {'selected': self.lookup_val == val, |
| 'query_string': cl.get_query_string({self.field.name: val}), |
| 'display': val} |
| FilterSpec.register(lambda f: True, AllValuesFilterSpec) |
