author | Lennard de Rijk <ljvderijk@gmail.com> |
Sat, 28 Feb 2009 13:06:04 +0000 | |
changeset 1559 | 283046e54c01 |
parent 1308 | 35b75ffcbb37 |
child 1970 | 385ce0c25bd0 |
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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"""This module contains the Linkable base class Model.""" |
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__authors__ = [ |
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'"Todd Larsen" <tlarsen@google.com>', |
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] |
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import re |
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from google.appengine.ext import db |
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from django.utils.translation import ugettext |
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from soc.models import base |
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# start with ASCII lowercase |
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# (additional ASCII digit or lowercase |
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# -OR- |
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# underscore and ASCII digit or lowercase) |
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# zero or more of OR group |
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# |
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# * starting or ending underscores are *not* permitted |
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# * double internal underscores are *not* permitted |
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# |
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LINK_ID_PATTERN_CORE = r'[a-z](?:[0-9a-z]|_[0-9a-z])*' |
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LINK_ID_ARG_PATTERN = r'(?P<link_id>%s)' % LINK_ID_PATTERN_CORE |
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LINK_ID_PATTERN = r'^%s$' % LINK_ID_PATTERN_CORE |
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LINK_ID_REGEX = re.compile(LINK_ID_PATTERN) |
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# scope path is multiple link_id chunks, |
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# each separated by a trailing / |
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# (at least 1) |
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SCOPE_PATH_ARG_PATTERN = (r'(?P<scope_path>%(link_id)s' |
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'(?:/%(link_id)s)*)' % { |
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'link_id': LINK_ID_PATTERN_CORE}) |
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SCOPE_PATH_PATTERN = r'^%s$' % SCOPE_PATH_ARG_PATTERN |
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SCOPE_PATH_REGEX = re.compile(SCOPE_PATH_PATTERN) |
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# path is multiple link_id chunks, |
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# each separated by a trailing / |
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# (at least 1) |
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# followed by a single link_id with no trailing / |
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PATH_LINK_ID_ARGS_PATTERN = ( |
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r'%(scope_path)s/' |
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'(?P<link_id>%(link_id)s)' % { |
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'scope_path' : SCOPE_PATH_ARG_PATTERN, |
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'link_id': LINK_ID_PATTERN_CORE}) |
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PATH_LINK_ID_PATTERN = r'^%s$' % PATH_LINK_ID_ARGS_PATTERN |
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PATH_LINK_ID_REGEX = re.compile(PATH_LINK_ID_PATTERN) |
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class Linkable(base.ModelWithFieldAttributes): |
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"""A base class for Model classes that are "linkable". |
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Many entities in Melange are identified by a "link path" that is formed |
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by two components: a "link scope" and a "link ID". |
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The link scope is a reference to another Linkable entity, but its exact |
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usage varies depending on: |
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* the Model type of the entity |
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* the "ownership" of the entity |
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This scope represents the "context" of the entity and is *not* user- |
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editable (site Developers will be able to *carefully* edit the scope |
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of a Linkable entity, but implementing this will be tricky). |
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Appended to this "link path prefix" generated from the transitive |
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closure of the link scopes is a link ID. Unlike the rest of the link |
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path, this ID, which must be unique within the scope defined by the link |
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path, is *not* determined by context and *is* supplied by the user. |
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For example, a Document containing the FAQs for the Apache Software |
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Foundation participation in GSoC 2009 program sponsored |
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by Google could be given a link ID by the Apache organization |
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administrator of "faqs", but the rest of the link path would be |
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determined by the transitive closure of the scopes of the Document: |
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google/gsoc2009/asf/faqs |
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^ ^ ^ ^ |
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| | | +--------- link ID assigned by Apache admin |
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| | | |
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| | +------------- Apache org link ID (immutable) |
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| | |
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| +-------------------- GSoC 2009 program link ID (immutable) |
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| |
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+---------------------------- Google sponsor link ID (immutable) |
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For many entities, link IDs, once specified, are immutable, since |
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changing them can break bookmarked URLs. Changing the link IDs of |
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"leaf" entities (such as the Document in the example above) could |
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be allowed. |
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""" |
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Small comment fix in Linkable model.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
510
diff
changeset
|
111 |
#: Required field storing "ID" used in URL links. Lower ASCII characters, |
475
8bd9db1d7a30
Copy the link_name regex patterns into linkable.py, in preparation for
Todd Larsen <tlarsen@google.com>
parents:
468
diff
changeset
|
112 |
#: digits and underscores only. Valid link IDs successfully match |
8bd9db1d7a30
Copy the link_name regex patterns into linkable.py, in preparation for
Todd Larsen <tlarsen@google.com>
parents:
468
diff
changeset
|
113 |
#: the LINK_ID_REGEX. |
510
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
114 |
link_id = db.StringProperty(required=True, |
970
8b5611d5b053
Use ugettext instead of ugettext_lazy
Sverre Rabbelier <srabbelier@gmail.com>
parents:
568
diff
changeset
|
115 |
verbose_name=ugettext('Link ID')) |
8b5611d5b053
Use ugettext instead of ugettext_lazy
Sverre Rabbelier <srabbelier@gmail.com>
parents:
568
diff
changeset
|
116 |
link_id.help_text = ugettext( |
549
00a9ce3dc082
Fix some broken help_text bubbles (they are truncated or not displayed if they
Todd Larsen <tlarsen@google.com>
parents:
533
diff
changeset
|
117 |
'Link ID is used as part of various URL links throughout the site.' |
475
8bd9db1d7a30
Copy the link_name regex patterns into linkable.py, in preparation for
Todd Larsen <tlarsen@google.com>
parents:
468
diff
changeset
|
118 |
' Lower ASCII characters, digits, and underscores only.') |
467
07441582717a
Initial thoughts on a Linkable Model class. Please comment.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
119 |
|
468
198105fb00bc
Fix typo in linkable model and add some missing comments.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
467
diff
changeset
|
120 |
#: Optional Self Reference property to another Linkable entity which defines |
198105fb00bc
Fix typo in linkable model and add some missing comments.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
467
diff
changeset
|
121 |
#: the "scope" of this Linkable entity. The back-reference in the Linkable |
198105fb00bc
Fix typo in linkable model and add some missing comments.
Pawel Solyga <Pawel.Solyga@gmail.com>
parents:
467
diff
changeset
|
122 |
#: model is a Query named 'links'. |
467
07441582717a
Initial thoughts on a Linkable Model class. Please comment.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
123 |
scope = db.SelfReferenceProperty(required=False, |
970
8b5611d5b053
Use ugettext instead of ugettext_lazy
Sverre Rabbelier <srabbelier@gmail.com>
parents:
568
diff
changeset
|
124 |
collection_name='links', verbose_name=ugettext('Link Scope')) |
8b5611d5b053
Use ugettext instead of ugettext_lazy
Sverre Rabbelier <srabbelier@gmail.com>
parents:
568
diff
changeset
|
125 |
scope.help_text = ugettext( |
467
07441582717a
Initial thoughts on a Linkable Model class. Please comment.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
126 |
'Reference to another Linkable entity that defines the "scope" of' |
07441582717a
Initial thoughts on a Linkable Model class. Please comment.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
127 |
' this Linkable entity.') |
510
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
128 |
|
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
129 |
#: Hidden (not displayed to users or editable in forms) cache of the string |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
130 |
#: representation of the transitive closure of scopes, for use in URLs. |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
131 |
#: The multiple queries required to produce this string for entities in |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
132 |
#: deeply-nested scopes can be prohibitively expensive. The scope of an |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
133 |
#: entity is not expected to change frequently (only for move, copy, and |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
134 |
#: maybe re-parenting operations), so this property is not likely to need |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
135 |
#: updating. |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
136 |
scope_path = db.StringProperty(required=False, |
970
8b5611d5b053
Use ugettext instead of ugettext_lazy
Sverre Rabbelier <srabbelier@gmail.com>
parents:
568
diff
changeset
|
137 |
verbose_name=ugettext('Scope path')) |
8b5611d5b053
Use ugettext instead of ugettext_lazy
Sverre Rabbelier <srabbelier@gmail.com>
parents:
568
diff
changeset
|
138 |
scope_path.help_text = ugettext( |
510
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
139 |
'Cache of the string form of the entity scope.') |
6cd4f44891e5
id() is a built-in function in Python, so rename the property to link_id. Add
Todd Larsen <tlarsen@google.com>
parents:
503
diff
changeset
|
140 |