author | Pawel Solyga <Pawel.Solyga@gmail.com> |
Mon, 18 May 2009 19:37:38 +0200 | |
changeset 2327 | 6c7d0fba105c |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
109
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""" |
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28. Many-to-many relationships between the same two tables |
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In this example, A Person can have many friends, who are also people. Friendship is a |
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symmetrical relationship - if I am your friend, you are my friend. |
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A person can also have many idols - but while I may idolize you, you may not think |
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the same of me. 'Idols' is an example of a non-symmetrical m2m field. Only recursive |
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m2m fields may be non-symmetrical, and they are symmetrical by default. |
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This test validates that the m2m table will create a mangled name for the m2m table if |
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there will be a clash, and tests that symmetry is preserved where appropriate. |
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""" |
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from django.db import models |
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class Person(models.Model): |
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name = models.CharField(maxlength=20) |
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friends = models.ManyToManyField('self') |
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idols = models.ManyToManyField('self', symmetrical=False, related_name='stalkers') |
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def __str__(self): |
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return self.name |
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__test__ = {'API_TESTS':""" |
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>>> a = Person(name='Anne') |
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>>> a.save() |
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>>> b = Person(name='Bill') |
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>>> b.save() |
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>>> c = Person(name='Chuck') |
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>>> c.save() |
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>>> d = Person(name='David') |
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>>> d.save() |
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# Add some friends in the direction of field definition |
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# Anne is friends with Bill and Chuck |
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>>> a.friends.add(b,c) |
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# David is friends with Anne and Chuck - add in reverse direction |
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>>> d.friends.add(a,c) |
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# Who is friends with Anne? |
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>>> a.friends.all() |
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[<Person: Bill>, <Person: Chuck>, <Person: David>] |
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# Who is friends with Bill? |
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>>> b.friends.all() |
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[<Person: Anne>] |
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# Who is friends with Chuck? |
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>>> c.friends.all() |
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[<Person: Anne>, <Person: David>] |
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# Who is friends with David? |
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>>> d.friends.all() |
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[<Person: Anne>, <Person: Chuck>] |
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# Bill is already friends with Anne - add Anne again, but in the reverse direction |
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>>> b.friends.add(a) |
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# Who is friends with Anne? |
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>>> a.friends.all() |
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[<Person: Bill>, <Person: Chuck>, <Person: David>] |
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# Who is friends with Bill? |
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>>> b.friends.all() |
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[<Person: Anne>] |
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# Remove Anne from Bill's friends |
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>>> b.friends.remove(a) |
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# Who is friends with Anne? |
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>>> a.friends.all() |
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[<Person: Chuck>, <Person: David>] |
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# Who is friends with Bill? |
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>>> b.friends.all() |
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[] |
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# Clear Anne's group of friends |
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>>> a.friends.clear() |
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# Who is friends with Anne? |
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>>> a.friends.all() |
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[] |
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# Reverse relationships should also be gone |
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# Who is friends with Chuck? |
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>>> c.friends.all() |
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[<Person: David>] |
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# Who is friends with David? |
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>>> d.friends.all() |
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[<Person: Chuck>] |
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# Add some idols in the direction of field definition |
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# Anne idolizes Bill and Chuck |
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>>> a.idols.add(b,c) |
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# Bill idolizes Anne right back |
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>>> b.idols.add(a) |
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# David is idolized by Anne and Chuck - add in reverse direction |
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>>> d.stalkers.add(a,c) |
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# Who are Anne's idols? |
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>>> a.idols.all() |
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[<Person: Bill>, <Person: Chuck>, <Person: David>] |
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# Who is stalking Anne? |
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>>> a.stalkers.all() |
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[<Person: Bill>] |
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|
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115 |
# Who are Bill's idols? |
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116 |
>>> b.idols.all() |
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117 |
[<Person: Anne>] |
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|
118 |
|
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|
119 |
# Who is stalking Bill? |
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|
120 |
>>> b.stalkers.all() |
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121 |
[<Person: Anne>] |
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122 |
|
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|
123 |
# Who are Chuck's idols? |
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|
124 |
>>> c.idols.all() |
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125 |
[<Person: David>] |
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126 |
|
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|
127 |
# Who is stalking Chuck? |
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|
128 |
>>> c.stalkers.all() |
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129 |
[<Person: Anne>] |
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|
130 |
|
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|
131 |
# Who are David's idols? |
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|
132 |
>>> d.idols.all() |
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133 |
[] |
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|
134 |
|
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|
135 |
# Who is stalking David |
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|
136 |
>>> d.stalkers.all() |
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137 |
[<Person: Anne>, <Person: Chuck>] |
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|
138 |
|
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|
139 |
# Bill is already being stalked by Anne - add Anne again, but in the reverse direction |
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|
140 |
>>> b.stalkers.add(a) |
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|
141 |
|
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|
142 |
# Who are Anne's idols? |
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|
143 |
>>> a.idols.all() |
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|
144 |
[<Person: Bill>, <Person: Chuck>, <Person: David>] |
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|
145 |
|
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|
146 |
# Who is stalking Anne? |
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|
147 |
[<Person: Bill>] |
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|
148 |
|
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|
149 |
# Who are Bill's idols |
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|
150 |
>>> b.idols.all() |
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|
151 |
[<Person: Anne>] |
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|
152 |
|
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|
153 |
# Who is stalking Bill? |
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|
154 |
>>> b.stalkers.all() |
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|
155 |
[<Person: Anne>] |
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|
156 |
|
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|
157 |
# Remove Anne from Bill's list of stalkers |
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|
158 |
>>> b.stalkers.remove(a) |
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|
159 |
|
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|
160 |
# Who are Anne's idols? |
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parents:
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|
161 |
>>> a.idols.all() |
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|
162 |
[<Person: Chuck>, <Person: David>] |
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|
163 |
|
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|
164 |
# Who is stalking Anne? |
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parents:
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|
165 |
>>> a.stalkers.all() |
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|
166 |
[<Person: Bill>] |
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|
167 |
|
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|
168 |
# Who are Bill's idols? |
620f9b141567
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parents:
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|
169 |
>>> b.idols.all() |
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parents:
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|
170 |
[<Person: Anne>] |
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parents:
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|
171 |
|
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|
172 |
# Who is stalking Bill? |
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parents:
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|
173 |
>>> b.stalkers.all() |
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parents:
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|
174 |
[] |
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|
175 |
|
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Todd Larsen <tlarsen@google.com>
parents:
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|
176 |
# Clear Anne's group of idols |
620f9b141567
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parents:
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|
177 |
>>> a.idols.clear() |
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|
178 |
|
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|
179 |
# Who are Anne's idols |
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parents:
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|
180 |
>>> a.idols.all() |
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|
181 |
[] |
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Todd Larsen <tlarsen@google.com>
parents:
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|
182 |
|
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
183 |
# Reverse relationships should also be gone |
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Todd Larsen <tlarsen@google.com>
parents:
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changeset
|
184 |
# Who is stalking Chuck? |
620f9b141567
Load ../../google_appengine into trunk/thirdparty/google_appengine.
Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
185 |
>>> c.stalkers.all() |
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Todd Larsen <tlarsen@google.com>
parents:
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|
186 |
[] |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
187 |
|
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
188 |
# Who is friends with David? |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
189 |
>>> d.stalkers.all() |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
190 |
[<Person: Chuck>] |
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parents:
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|
191 |
|
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|
192 |
"""} |