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group_tags.py
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group_tags.py
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from django import template
from django.utils.encoding import smart_str
from django.core.urlresolvers import reverse, NoReverseMatch
from django.db.models import get_model
from django.db.models.query import QuerySet
register = template.Library()
class GroupURLNode(template.Node):
def __init__(self, view_name, group, kwargs, asvar):
self.view_name = view_name
self.group = group
self.kwargs = kwargs
self.asvar = asvar
def render(self, context):
url = ""
group = self.group.resolve(context)
kwargs = {}
for k, v in self.kwargs.items():
kwargs[smart_str(k, "ascii")] = v.resolve(context)
if group:
bridge = group.content_bridge
try:
url = bridge.reverse(self.view_name, group, kwargs=kwargs)
except NoReverseMatch:
if self.asvar is None:
raise
else:
try:
url = reverse(self.view_name, kwargs=kwargs)
except NoReverseMatch:
if self.asvar is None:
raise
if self.asvar:
context[self.asvar] = url
return ""
else:
return url
class ContentObjectsNode(template.Node):
def __init__(self, group_var, model_name_var, gfk_field_var, context_var):
self.group_var = template.Variable(group_var)
self.model_name_var = template.Variable(model_name_var)
if gfk_field_var is not None:
self.gfk_field_var = template.Variable(gfk_field_var)
else:
self.gfk_field_var = None
self.context_var = context_var
def render(self, context):
group = self.group_var.resolve(context)
model_name = self.model_name_var.resolve(context)
if self.gfk_field_var is not None:
gfk_field = self.gfk_field_var.resolve(context)
else:
gfk_field = None
if isinstance(model_name, QuerySet):
model = model_name
else:
app_name, model_name = model_name.split(".")
model = get_model(app_name, model_name)
context[self.context_var] = group.content_objects(model, gfk_field=gfk_field)
return ""
class ObjectGroupUrlNode(template.Node):
def __init__(self, obj, group, asvar):
self.obj_var = template.Variable(obj)
self.group = group
self.asvar = asvar
def render(self, context):
url = ""
obj = self.obj_var.resolve(context)
group = self.group.resolve(context)
try:
url = obj.get_absolute_url(group)
except NoReverseMatch:
if self.asvar is None:
raise
if self.asvar:
context[self.asvar] = url
return ""
else:
return url
@register.tag
def groupurl(parser, token):
bits = token.contents.split()
tag_name = bits[0]
if len(bits) < 3:
raise template.TemplateSyntaxError("'%s' takes at least two arguments"
" (path to a view and a group)" % tag_name)
view_name = bits[1]
group = parser.compile_filter(bits[2])
args = []
kwargs = {}
asvar = None
if len(bits) > 3:
bits = iter(bits[3:])
for bit in bits:
if bit == "as":
asvar = bits.next()
break
else:
for arg in bit.split(","):
if "=" in arg:
k, v = arg.split("=", 1)
k = k.strip()
kwargs[k] = parser.compile_filter(v)
elif arg:
raise template.TemplateSyntaxError("'%s' does not support non-kwargs arguments." % tag_name)
return GroupURLNode(view_name, group, kwargs, asvar)
@register.tag
def content_objects(parser, token):
"""
Basic usage::
{% content_objects group "tasks.Task" as tasks %}
or if you need to specify a custom generic foreign key field (default is
group)::
{% content_objects group "tasks.Task" "content_object" as tasks %}
"""
bits = token.split_contents()
if len(bits) not in [5, 6]:
raise template.TemplateSyntaxError("'%s' requires five or six arguments." % bits[0])
else:
if len(bits) == 5:
return ContentObjectsNode(bits[1], bits[2], None, bits[4])
else:
return ContentObjectsNode(bits[1], bits[2], bits[3], bits[5])
@register.tag
def object_group_url(parser, token):
"""
given an object and an optional group, call get_absolute_url passing the
group variable::
{% object_group_url task group %}
"""
bits = token.contents.split()
tag_name = bits[0]
if len(bits) < 3:
raise template.TemplateSyntaxError("'%s' takes at least two arguments"
" (object and a group)" % tag_name)
obj = bits[1]
group = parser.compile_filter(bits[2])
if len(bits) > 3:
if bits[3] != "as":
raise template.TemplateSyntaxError("'%s' requires the forth"
" argument to be 'as'" % tag_name)
try:
asvar = bits[4]
except IndexError:
raise template.TemplateSyntaxError("'%s' requires an argument"
" after 'as'" % tag_name)
return ObjectGroupUrlNode(obj, group, asvar)