author | Sverre Rabbelier <srabbelier@gmail.com> |
Sun, 15 Mar 2009 13:36:14 +0000 | |
changeset 1865 | f00720cddea0 |
parent 1821 | 6a548cbb0f7e |
child 2049 | d9adbaf1c30f |
permissions | -rw-r--r-- |
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#!/usr/bin/python2.5 |
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# |
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# Copyright 2008 the Melange authors. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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|
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"""Helpers used to render lists. |
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""" |
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|
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__authors__ = [ |
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'"Chen Lunpeng" <forever.clp@gmail.com>', |
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'"Pawel Solyga" <pawel.solyga@gmail.com>', |
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] |
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|
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import itertools |
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from soc.logic import dicts |
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from soc.logic.models.user import logic as user_logic |
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import soc.views.helper.forms |
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DEF_DEFAULT_PAGINATION = 50 |
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DEF_MAX_PAGINATION = 100 |
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DEF_MAX_DEV_PAGINATION = 1000 |
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DEF_PAGINATION_CHOICES = [ |
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('10', '10 items per page'), |
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('25', '25 items per page'), |
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('50', '50 items per page'), |
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('100', '100 items per page'), |
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] |
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DEF_DEVELOPER_CHOICES = [ |
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('500', '500 items per page'), |
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('1000', '1000 items per page'), |
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] |
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def getPreferredListPagination(user=None): |
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"""Returns User's preferred list pagination limit. |
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Args: |
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user: User entity containing the list pagination preference; |
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default is None, to use the current logged-in User |
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""" |
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# TODO: eventually this limit should be a User profile preference |
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# (stored in the site-wide User Model) preference |
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return DEF_DEFAULT_PAGINATION |
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def getLimitAndOffset(request, offset_key, limit_key): |
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"""Retrieves, converts and validates offset and limit values |
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Args: |
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offset: offset in list which defines first item to return |
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limit: max amount of items per page |
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Returns: |
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updated offset and limit values |
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""" |
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offset = request.GET.get(offset_key) |
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limit = request.GET.get(limit_key) |
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if offset is None: |
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offset = '' |
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if limit is None: |
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limit = '' |
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try: |
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offset = int(offset) |
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except ValueError: |
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offset = 0 |
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try: |
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limit = int(limit) |
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except ValueError: |
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limit = getPreferredListPagination() |
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offset = max(0, offset) |
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limit = max(1, limit) |
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if user_logic.isDeveloper(): |
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limit = min(DEF_MAX_DEV_PAGINATION, limit) |
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else: |
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limit = min(DEF_MAX_PAGINATION, limit) |
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return limit, offset |
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def generateLinkFromGetArgs(request, offset_and_limits): |
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105 |
"""Constructs the get args for the url. |
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106 |
""" |
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|
107 |
|
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108 |
args = ["%s=%s" % (k, v) for k, v in offset_and_limits.iteritems()] |
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109 |
link_suffix = '?' + '&'.join(args) |
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|
110 |
|
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111 |
return request.path + link_suffix |
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112 |
|
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113 |
|
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114 |
def getListContent(request, params, filter=None, order=None, |
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115 |
idx=0, need_content=False): |
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116 |
"""Returns a dict with fields used for rendering lists. |
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117 |
|
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118 |
Args: |
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119 |
request: the Django HTTP request object |
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120 |
params: a dict with params for the View this list belongs to |
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121 |
filter: a filter for this list |
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order: the order which should be used for the list (in getForFields format) |
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123 |
idx: the index of this list |
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124 |
need_content: iff True will return None if there is no data |
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125 |
|
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126 |
Returns: |
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127 |
A a dictionary with the following values set: |
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|
128 |
|
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129 |
{ |
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130 |
'data': list data to be displayed |
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131 |
'main': url to list main template |
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132 |
'pagination': url to list pagination template |
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133 |
'row': url to list row template |
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134 |
'heading': url to list heading template |
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|
135 |
'limit': max amount of items per page, |
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|
136 |
'newest': url to first page of the list |
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|
137 |
'prev': url to previous page |
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|
138 |
'next': url to next page |
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|
139 |
'first': offset of the first item in the list |
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140 |
'last': offest of the lst item in the list |
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|
141 |
} |
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|
142 |
""" |
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|
143 |
|
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|
144 |
logic = params['logic'] |
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|
145 |
|
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|
146 |
offset_key = 'offset_%d' % idx |
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|
147 |
limit_key = 'limit_%d' % idx |
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|
148 |
|
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|
149 |
limit, offset = getLimitAndOffset(request, offset_key, limit_key) |
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|
150 |
pagination_form = makePaginationForm(request, limit, limit_key) |
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|
151 |
|
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|
152 |
# Fetch one more to see if there should be a 'next' link |
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153 |
data = logic.getForFields(filter=filter, limit=limit+1, offset=offset, |
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|
154 |
order=order) |
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|
155 |
|
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|
156 |
if need_content and not data: |
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|
157 |
return None |
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|
158 |
|
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|
159 |
more = len(data) > limit |
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|
160 |
|
185
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|
161 |
if more: |
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|
162 |
del data[limit:] |
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|
163 |
|
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|
164 |
newest = next = prev = export_link ='' |
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|
165 |
|
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|
166 |
get_args = request.GET |
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|
167 |
offset_and_limits = {} |
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|
168 |
|
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|
169 |
for key, value in get_args.iteritems(): |
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|
170 |
if key.startswith('offset_') or key.startswith('limit_'): |
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|
171 |
offset_and_limits[key] = value |
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|
172 |
|
1821
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|
173 |
if params.get('list_key_order'): |
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|
174 |
offset_and_limits['export'] = idx |
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|
175 |
export_link = generateLinkFromGetArgs(request, offset_and_limits) |
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|
176 |
del offset_and_limits['export'] |
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|
177 |
|
185
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|
178 |
if more: |
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|
179 |
offset_and_limits[offset_key] = offset+limit |
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|
180 |
offset_and_limits[limit_key] = limit |
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|
181 |
next = generateLinkFromGetArgs(request, offset_and_limits) |
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|
182 |
|
185
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|
183 |
if offset > 0: |
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|
184 |
offset_and_limits[offset_key] = max(0, offset-limit) |
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|
185 |
offset_and_limits[limit_key] = limit |
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|
186 |
prev = generateLinkFromGetArgs(request, offset_and_limits) |
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|
187 |
|
185
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|
188 |
if offset > limit: |
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|
189 |
del offset_and_limits[offset_key] |
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|
190 |
offset_and_limits[limit_key] = limit |
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|
191 |
|
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|
192 |
newest = generateLinkFromGetArgs(request, offset_and_limits) |
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|
193 |
|
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|
194 |
content = { |
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|
195 |
'data': data, |
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|
196 |
'export': export_link, |
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|
197 |
'first': offset+1, |
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|
198 |
'last': len(data) > 1 and offset+len(data) or None, |
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|
199 |
'logic': logic, |
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|
200 |
'limit': limit, |
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|
201 |
'newest': newest, |
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|
202 |
'next': next, |
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|
203 |
'pagination_form': pagination_form, |
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|
204 |
'prev': prev, |
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|
205 |
} |
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|
206 |
|
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|
207 |
updates = dicts.rename(params, params['list_params']) |
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|
208 |
content.update(updates) |
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|
209 |
|
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|
210 |
return content |
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|
211 |
|
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|
212 |
|
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|
213 |
def makePaginationForm( |
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request, limit, arg_name, choices=DEF_PAGINATION_CHOICES, |
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field_name_fmt=soc.views.helper.forms.DEF_SELECT_QUERY_ARG_FIELD_NAME_FMT): |
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"""Returns a customized pagination limit selection form. |
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Args: |
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request: the standard Django HTTP request object |
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limit: the initial value of the selection control |
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arg_name: see soc.views.helper.forms.makeSelectQueryArgForm(); default is 'limit' |
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choices: see soc.views.helper.forms.makeSelectQueryArgForm(); default is |
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DEF_PAGINATION_CHOICES |
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field_name_fmt: see soc.views.helper.forms.makeSelectQueryArgForm() |
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""" |
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choices = makeNewPaginationChoices(limit=limit, choices=choices) |
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return soc.views.helper.forms.makeSelectQueryArgForm( |
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request, arg_name, limit, choices) |
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def makeNewPaginationChoices(limit=DEF_DEFAULT_PAGINATION, |
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choices=DEF_PAGINATION_CHOICES): |
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"""Updates the pagination limit selection form. |
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Args: |
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limit: the initial value of the selection control; |
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default is DEF_DEFAULT_PAGINATION |
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choices: see soc.views.helper.forms.makeSelectQueryArgForm(); |
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default is DEF_PAGINATION_CHOICES |
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|
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Returns: |
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a new pagination choices list if limit is not in |
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DEF_PAGINATION_CHOICES, or DEF_PAGINATION_CHOICES otherwise |
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""" |
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new_choices = [] |
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new_choice = (str(limit), '%s items per page' % limit) |
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new_choices.append(new_choice) |
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new_choices.extend(choices) |
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if user_logic.isDeveloper(): |
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new_choices.extend(DEF_DEVELOPER_CHOICES) |
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new_choices = set(new_choices) |
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return sorted(new_choices, key=lambda (x, y): int(x)) |