author | Lennard de Rijk <ljvderijk@gmail.com> |
Fri, 10 Apr 2009 15:32:11 +0000 | |
changeset 2146 | 57c74ce47fa3 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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from django import template |
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from django.template.loader import render_to_string |
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from django.conf import settings |
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4 |
from django.contrib.contenttypes.models import ContentType |
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from django.contrib import comments |
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6 |
from django.utils.encoding import smart_unicode |
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7 |
|
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8 |
register = template.Library() |
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9 |
|
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10 |
class BaseCommentNode(template.Node): |
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11 |
""" |
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12 |
Base helper class (abstract) for handling the get_comment_* template tags. |
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13 |
Looks a bit strange, but the subclasses below should make this a bit more |
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14 |
obvious. |
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15 |
""" |
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17 |
#@classmethod |
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def handle_token(cls, parser, token): |
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"""Class method to parse get_comment_list/count/form and return a Node.""" |
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tokens = token.contents.split() |
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if tokens[1] != 'for': |
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raise template.TemplateSyntaxError("Second argument in %r tag must be 'for'" % tokens[0]) |
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|
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24 |
# {% get_whatever for obj as varname %} |
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if len(tokens) == 5: |
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if tokens[3] != 'as': |
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raise template.TemplateSyntaxError("Third argument in %r must be 'as'" % tokens[0]) |
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return cls( |
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object_expr = parser.compile_filter(tokens[2]), |
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as_varname = tokens[4], |
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31 |
) |
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32 |
|
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33 |
# {% get_whatever for app.model pk as varname %} |
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elif len(tokens) == 6: |
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if tokens[4] != 'as': |
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raise template.TemplateSyntaxError("Fourth argument in %r must be 'as'" % tokens[0]) |
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37 |
return cls( |
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38 |
ctype = BaseCommentNode.lookup_content_type(tokens[2], tokens[0]), |
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object_pk_expr = parser.compile_filter(tokens[3]), |
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as_varname = tokens[5] |
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41 |
) |
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42 |
|
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43 |
else: |
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44 |
raise template.TemplateSyntaxError("%r tag requires 4 or 5 arguments" % tokens[0]) |
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45 |
|
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46 |
handle_token = classmethod(handle_token) |
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|
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#@staticmethod |
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49 |
def lookup_content_type(token, tagname): |
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try: |
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51 |
app, model = token.split('.') |
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52 |
return ContentType.objects.get(app_label=app, model=model) |
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53 |
except ValueError: |
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raise template.TemplateSyntaxError("Third argument in %r must be in the format 'app.model'" % tagname) |
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except ContentType.DoesNotExist: |
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raise template.TemplateSyntaxError("%r tag has non-existant content-type: '%s.%s'" % (tagname, app, model)) |
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lookup_content_type = staticmethod(lookup_content_type) |
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58 |
|
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59 |
def __init__(self, ctype=None, object_pk_expr=None, object_expr=None, as_varname=None, comment=None): |
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if ctype is None and object_expr is None: |
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61 |
raise template.TemplateSyntaxError("Comment nodes must be given either a literal object or a ctype and object pk.") |
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self.comment_model = comments.get_model() |
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self.as_varname = as_varname |
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self.ctype = ctype |
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self.object_pk_expr = object_pk_expr |
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self.object_expr = object_expr |
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self.comment = comment |
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def render(self, context): |
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qs = self.get_query_set(context) |
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context[self.as_varname] = self.get_context_value_from_queryset(context, qs) |
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return '' |
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|
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def get_query_set(self, context): |
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ctype, object_pk = self.get_target_ctype_pk(context) |
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if not object_pk: |
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return self.comment_model.objects.none() |
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qs = self.comment_model.objects.filter( |
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content_type = ctype, |
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object_pk = smart_unicode(object_pk), |
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site__pk = settings.SITE_ID, |
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is_public = True, |
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) |
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if getattr(settings, 'COMMENTS_HIDE_REMOVED', True): |
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qs = qs.filter(is_removed=False) |
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|
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88 |
return qs |
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89 |
|
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90 |
def get_target_ctype_pk(self, context): |
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if self.object_expr: |
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try: |
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obj = self.object_expr.resolve(context) |
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except template.VariableDoesNotExist: |
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return None, None |
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96 |
return ContentType.objects.get_for_model(obj), obj.pk |
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97 |
else: |
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98 |
return self.ctype, self.object_pk_expr.resolve(context, ignore_failures=True) |
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99 |
|
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def get_context_value_from_queryset(self, context, qs): |
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101 |
"""Subclasses should override this.""" |
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102 |
raise NotImplementedError |
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103 |
|
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104 |
class CommentListNode(BaseCommentNode): |
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105 |
"""Insert a list of comments into the context.""" |
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106 |
def get_context_value_from_queryset(self, context, qs): |
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107 |
return list(qs) |
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108 |
|
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109 |
class CommentCountNode(BaseCommentNode): |
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110 |
"""Insert a count of comments into the context.""" |
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111 |
def get_context_value_from_queryset(self, context, qs): |
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112 |
return qs.count() |
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113 |
|
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114 |
class CommentFormNode(BaseCommentNode): |
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115 |
"""Insert a form for the comment model into the context.""" |
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116 |
|
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117 |
def get_form(self, context): |
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118 |
ctype, object_pk = self.get_target_ctype_pk(context) |
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119 |
if object_pk: |
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120 |
return comments.get_form()(ctype.get_object_for_this_type(pk=object_pk)) |
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121 |
else: |
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122 |
return None |
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123 |
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124 |
def render(self, context): |
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125 |
context[self.as_varname] = self.get_form(context) |
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126 |
return '' |
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127 |
|
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128 |
class RenderCommentFormNode(CommentFormNode): |
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129 |
"""Render the comment form directly""" |
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130 |
|
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131 |
#@classmethod |
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132 |
def handle_token(cls, parser, token): |
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133 |
"""Class method to parse render_comment_form and return a Node.""" |
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134 |
tokens = token.contents.split() |
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135 |
if tokens[1] != 'for': |
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136 |
raise template.TemplateSyntaxError("Second argument in %r tag must be 'for'" % tokens[0]) |
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137 |
|
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138 |
# {% render_comment_form for obj %} |
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139 |
if len(tokens) == 3: |
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140 |
return cls(object_expr=parser.compile_filter(tokens[2])) |
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141 |
|
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142 |
# {% render_comment_form for app.models pk %} |
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143 |
elif len(tokens) == 4: |
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144 |
return cls( |
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145 |
ctype = BaseCommentNode.lookup_content_type(tokens[2], tokens[0]), |
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146 |
object_pk_expr = parser.compile_filter(tokens[3]) |
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147 |
) |
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148 |
handle_token = classmethod(handle_token) |
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149 |
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150 |
def render(self, context): |
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151 |
ctype, object_pk = self.get_target_ctype_pk(context) |
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152 |
if object_pk: |
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153 |
template_search_list = [ |
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154 |
"comments/%s/%s/form.html" % (ctype.app_label, ctype.model), |
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155 |
"comments/%s/form.html" % ctype.app_label, |
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156 |
"comments/form.html" |
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157 |
] |
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158 |
context.push() |
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159 |
formstr = render_to_string(template_search_list, {"form" : self.get_form(context)}, context) |
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160 |
context.pop() |
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161 |
return formstr |
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162 |
else: |
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163 |
return '' |
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164 |
|
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165 |
# We could just register each classmethod directly, but then we'd lose out on |
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166 |
# the automagic docstrings-into-admin-docs tricks. So each node gets a cute |
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167 |
# wrapper function that just exists to hold the docstring. |
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168 |
|
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169 |
#@register.tag |
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170 |
def get_comment_count(parser, token): |
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171 |
""" |
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172 |
Gets the comment count for the given params and populates the template |
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173 |
context with a variable containing that value, whose name is defined by the |
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|
174 |
'as' clause. |
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175 |
|
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176 |
Syntax:: |
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177 |
|
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178 |
{% get_comment_count for [object] as [varname] %} |
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179 |
{% get_comment_count for [app].[model] [object_id] as [varname] %} |
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180 |
|
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181 |
Example usage:: |
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182 |
|
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183 |
{% get_comment_count for event as comment_count %} |
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184 |
{% get_comment_count for calendar.event event.id as comment_count %} |
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185 |
{% get_comment_count for calendar.event 17 as comment_count %} |
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186 |
|
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187 |
""" |
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188 |
return CommentCountNode.handle_token(parser, token) |
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189 |
|
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190 |
#@register.tag |
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191 |
def get_comment_list(parser, token): |
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192 |
""" |
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193 |
Gets the list of comments for the given params and populates the template |
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194 |
context with a variable containing that value, whose name is defined by the |
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195 |
'as' clause. |
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196 |
|
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197 |
Syntax:: |
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198 |
|
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199 |
{% get_comment_list for [object] as [varname] %} |
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200 |
{% get_comment_list for [app].[model] [object_id] as [varname] %} |
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201 |
|
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202 |
Example usage:: |
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203 |
|
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204 |
{% get_comment_list for event as comment_list %} |
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205 |
{% for comment in comment_list %} |
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206 |
... |
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207 |
{% endfor %} |
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208 |
|
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209 |
""" |
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210 |
return CommentListNode.handle_token(parser, token) |
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211 |
|
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#@register.tag |
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def get_comment_form(parser, token): |
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""" |
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Get a (new) form object to post a new comment. |
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Syntax:: |
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{% get_comment_form for [object] as [varname] %} |
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{% get_comment_form for [app].[model] [object_id] as [varname] %} |
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""" |
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return CommentFormNode.handle_token(parser, token) |
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#@register.tag |
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def render_comment_form(parser, token): |
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""" |
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Render the comment form (as returned by ``{% render_comment_form %}``) through |
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the ``comments/form.html`` template. |
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Syntax:: |
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{% render_comment_form for [object] %} |
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{% render_comment_form for [app].[model] [object_id] %} |
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""" |
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return RenderCommentFormNode.handle_token(parser, token) |
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#@register.simple_tag |
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def comment_form_target(): |
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""" |
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Get the target URL for the comment form. |
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Example:: |
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<form action="{% comment_form_target %}" method="POST"> |
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""" |
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return comments.get_form_target() |
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register.tag(get_comment_count) |
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register.tag(get_comment_list) |
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register.tag(get_comment_form) |
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register.tag(render_comment_form) |
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register.simple_tag(comment_form_target) |