author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Fri, 22 Aug 2008 13:44:50 +0000 | |
changeset 99 | 8c38b546a3cf |
parent 54 | 03e267d67478 |
child 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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FilterSpec encapsulates the logic for displaying filters in the Django admin. |
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Filters are specified in models with the "list_filter" option. |
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|
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Each filter subclass knows how to display a filter for a field that passes a |
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certain test -- e.g. being a DateField or ForeignKey. |
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""" |
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|
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from django.db import models |
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from django.utils.encoding import smart_unicode, iri_to_uri |
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from django.utils.translation import ugettext as _ |
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from django.utils.html import escape |
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from django.utils.safestring import mark_safe |
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import datetime |
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|
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class FilterSpec(object): |
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filter_specs = [] |
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def __init__(self, f, request, params, model): |
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self.field = f |
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self.params = params |
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def register(cls, test, factory): |
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cls.filter_specs.append((test, factory)) |
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register = classmethod(register) |
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def create(cls, f, request, params, model): |
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for test, factory in cls.filter_specs: |
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if test(f): |
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return factory(f, request, params, model) |
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create = classmethod(create) |
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def has_output(self): |
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return True |
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def choices(self, cl): |
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raise NotImplementedError() |
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def title(self): |
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return self.field.verbose_name |
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def output(self, cl): |
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t = [] |
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if self.has_output(): |
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t.append(_(u'<h3>By %s:</h3>\n<ul>\n') % escape(self.title())) |
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for choice in self.choices(cl): |
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t.append(u'<li%s><a href="%s">%s</a></li>\n' % \ |
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((choice['selected'] and ' class="selected"' or ''), |
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iri_to_uri(choice['query_string']), |
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choice['display'])) |
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t.append('</ul>\n\n') |
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return mark_safe("".join(t)) |
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class RelatedFilterSpec(FilterSpec): |
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def __init__(self, f, request, params, model): |
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super(RelatedFilterSpec, self).__init__(f, request, params, model) |
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if isinstance(f, models.ManyToManyField): |
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self.lookup_title = f.rel.to._meta.verbose_name |
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else: |
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self.lookup_title = f.verbose_name |
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self.lookup_kwarg = '%s__%s__exact' % (f.name, f.rel.to._meta.pk.name) |
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self.lookup_val = request.GET.get(self.lookup_kwarg, None) |
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self.lookup_choices = f.rel.to._default_manager.all() |
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def has_output(self): |
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return len(self.lookup_choices) > 1 |
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def title(self): |
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return self.lookup_title |
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def choices(self, cl): |
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yield {'selected': self.lookup_val is None, |
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'query_string': cl.get_query_string({}, [self.lookup_kwarg]), |
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'display': _('All')} |
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for val in self.lookup_choices: |
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pk_val = getattr(val, self.field.rel.to._meta.pk.attname) |
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yield {'selected': self.lookup_val == smart_unicode(pk_val), |
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'query_string': cl.get_query_string({self.lookup_kwarg: pk_val}), |
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'display': val} |
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FilterSpec.register(lambda f: bool(f.rel), RelatedFilterSpec) |
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class ChoicesFilterSpec(FilterSpec): |
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def __init__(self, f, request, params, model): |
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super(ChoicesFilterSpec, self).__init__(f, request, params, model) |
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self.lookup_kwarg = '%s__exact' % f.name |
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self.lookup_val = request.GET.get(self.lookup_kwarg, None) |
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def choices(self, cl): |
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yield {'selected': self.lookup_val is None, |
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'query_string': cl.get_query_string({}, [self.lookup_kwarg]), |
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'display': _('All')} |
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for k, v in self.field.choices: |
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yield {'selected': smart_unicode(k) == self.lookup_val, |
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'query_string': cl.get_query_string({self.lookup_kwarg: k}), |
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'display': v} |
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FilterSpec.register(lambda f: bool(f.choices), ChoicesFilterSpec) |
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class DateFieldFilterSpec(FilterSpec): |
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def __init__(self, f, request, params, model): |
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super(DateFieldFilterSpec, self).__init__(f, request, params, model) |
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self.field_generic = '%s__' % self.field.name |
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self.date_params = dict([(k, v) for k, v in params.items() if k.startswith(self.field_generic)]) |
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today = datetime.date.today() |
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one_week_ago = today - datetime.timedelta(days=7) |
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today_str = isinstance(self.field, models.DateTimeField) and today.strftime('%Y-%m-%d 23:59:59') or today.strftime('%Y-%m-%d') |
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self.links = ( |
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113 |
(_('Any date'), {}), |
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114 |
(_('Today'), {'%s__year' % self.field.name: str(today.year), |
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115 |
'%s__month' % self.field.name: str(today.month), |
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116 |
'%s__day' % self.field.name: str(today.day)}), |
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117 |
(_('Past 7 days'), {'%s__gte' % self.field.name: one_week_ago.strftime('%Y-%m-%d'), |
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118 |
'%s__lte' % f.name: today_str}), |
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119 |
(_('This month'), {'%s__year' % self.field.name: str(today.year), |
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120 |
'%s__month' % f.name: str(today.month)}), |
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121 |
(_('This year'), {'%s__year' % self.field.name: str(today.year)}) |
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122 |
) |
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123 |
|
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124 |
def title(self): |
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125 |
return self.field.verbose_name |
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126 |
|
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127 |
def choices(self, cl): |
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128 |
for title, param_dict in self.links: |
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129 |
yield {'selected': self.date_params == param_dict, |
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'query_string': cl.get_query_string(param_dict, [self.field_generic]), |
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131 |
'display': title} |
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132 |
|
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FilterSpec.register(lambda f: isinstance(f, models.DateField), DateFieldFilterSpec) |
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134 |
|
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135 |
class BooleanFieldFilterSpec(FilterSpec): |
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136 |
def __init__(self, f, request, params, model): |
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super(BooleanFieldFilterSpec, self).__init__(f, request, params, model) |
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self.lookup_kwarg = '%s__exact' % f.name |
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self.lookup_kwarg2 = '%s__isnull' % f.name |
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self.lookup_val = request.GET.get(self.lookup_kwarg, None) |
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self.lookup_val2 = request.GET.get(self.lookup_kwarg2, None) |
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142 |
|
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143 |
def title(self): |
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144 |
return self.field.verbose_name |
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145 |
|
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146 |
def choices(self, cl): |
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for k, v in ((_('All'), None), (_('Yes'), '1'), (_('No'), '0')): |
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yield {'selected': self.lookup_val == v and not self.lookup_val2, |
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'query_string': cl.get_query_string({self.lookup_kwarg: v}, [self.lookup_kwarg2]), |
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'display': k} |
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151 |
if isinstance(self.field, models.NullBooleanField): |
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yield {'selected': self.lookup_val2 == 'True', |
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153 |
'query_string': cl.get_query_string({self.lookup_kwarg2: 'True'}, [self.lookup_kwarg]), |
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154 |
'display': _('Unknown')} |
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155 |
|
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FilterSpec.register(lambda f: isinstance(f, models.BooleanField) or isinstance(f, models.NullBooleanField), BooleanFieldFilterSpec) |
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157 |
|
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# This should be registered last, because it's a last resort. For example, |
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# if a field is eligible to use the BooleanFieldFilterSpec, that'd be much |
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# more appropriate, and the AllValuesFilterSpec won't get used for it. |
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161 |
class AllValuesFilterSpec(FilterSpec): |
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162 |
def __init__(self, f, request, params, model): |
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super(AllValuesFilterSpec, self).__init__(f, request, params, model) |
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self.lookup_val = request.GET.get(f.name, None) |
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165 |
self.lookup_choices = model._meta.admin.manager.distinct().order_by(f.name).values(f.name) |
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166 |
|
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167 |
def title(self): |
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168 |
return self.field.verbose_name |
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169 |
|
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170 |
def choices(self, cl): |
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yield {'selected': self.lookup_val is None, |
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172 |
'query_string': cl.get_query_string({}, [self.field.name]), |
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173 |
'display': _('All')} |
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174 |
for val in self.lookup_choices: |
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175 |
val = smart_unicode(val[self.field.name]) |
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176 |
yield {'selected': self.lookup_val == val, |
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177 |
'query_string': cl.get_query_string({self.field.name: val}), |
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178 |
'display': val} |
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179 |
FilterSpec.register(lambda f: True, AllValuesFilterSpec) |