author | Sverre Rabbelier <srabbelier@gmail.com> |
Thu, 02 Apr 2009 23:05:31 +0000 | |
changeset 2056 | bbd16a156bde |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
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""" |
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5. Many-to-many relationships |
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To define a many-to-many relationship, use ManyToManyField(). |
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In this example, an article can be published in multiple publications, |
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and a publication has multiple articles. |
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""" |
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from django.db import models |
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class Publication(models.Model): |
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title = models.CharField(maxlength=30) |
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def __str__(self): |
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return self.title |
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class Meta: |
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ordering = ('title',) |
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class Article(models.Model): |
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headline = models.CharField(maxlength=100) |
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publications = models.ManyToManyField(Publication) |
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def __str__(self): |
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return self.headline |
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class Meta: |
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ordering = ('headline',) |
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__test__ = {'API_TESTS':""" |
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# Create a couple of Publications. |
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>>> p1 = Publication(id=None, title='The Python Journal') |
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>>> p1.save() |
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>>> p2 = Publication(id=None, title='Science News') |
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>>> p2.save() |
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>>> p3 = Publication(id=None, title='Science Weekly') |
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>>> p3.save() |
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# Create an Article. |
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>>> a1 = Article(id=None, headline='Django lets you build Web apps easily') |
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>>> a1.save() |
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# Associate the Article with a Publication. |
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>>> a1.publications.add(p1) |
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# Create another Article, and set it to appear in both Publications. |
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>>> a2 = Article(id=None, headline='NASA uses Python') |
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>>> a2.save() |
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>>> a2.publications.add(p1, p2) |
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>>> a2.publications.add(p3) |
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# Adding a second time is OK |
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>>> a2.publications.add(p3) |
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# Add a Publication directly via publications.add by using keyword arguments. |
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>>> new_publication = a2.publications.create(title='Highlights for Children') |
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# Article objects have access to their related Publication objects. |
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>>> a1.publications.all() |
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[<Publication: The Python Journal>] |
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>>> a2.publications.all() |
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[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>, <Publication: The Python Journal>] |
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# Publication objects have access to their related Article objects. |
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>>> p2.article_set.all() |
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[<Article: NASA uses Python>] |
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>>> p1.article_set.all() |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Publication.objects.get(id=4).article_set.all() |
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[<Article: NASA uses Python>] |
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# We can perform kwarg queries across m2m relationships |
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>>> Article.objects.filter(publications__id__exact=1) |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications__pk=1) |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications=1) |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications=p1) |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications__title__startswith="Science") |
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[<Article: NASA uses Python>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications__title__startswith="Science").distinct() |
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[<Article: NASA uses Python>] |
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# The count() function respects distinct() as well. |
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>>> Article.objects.filter(publications__title__startswith="Science").count() |
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2 |
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>>> Article.objects.filter(publications__title__startswith="Science").distinct().count() |
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1 |
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>>> Article.objects.filter(publications__in=[1,2]).distinct() |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications__in=[1,p2]).distinct() |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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>>> Article.objects.filter(publications__in=[p1,p2]).distinct() |
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[<Article: Django lets you build Web apps easily>, <Article: NASA uses Python>] |
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# Reverse m2m queries are supported (i.e., starting at the table that doesn't |
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# have a ManyToManyField). |
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>>> Publication.objects.filter(id__exact=1) |
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[<Publication: The Python Journal>] |
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>>> Publication.objects.filter(pk=1) |
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[<Publication: The Python Journal>] |
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>>> Publication.objects.filter(article__headline__startswith="NASA") |
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111 |
[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>, <Publication: The Python Journal>] |
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|
112 |
|
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113 |
>>> Publication.objects.filter(article__id__exact=1) |
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114 |
[<Publication: The Python Journal>] |
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|
115 |
>>> Publication.objects.filter(article__pk=1) |
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116 |
[<Publication: The Python Journal>] |
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117 |
>>> Publication.objects.filter(article=1) |
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118 |
[<Publication: The Python Journal>] |
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119 |
>>> Publication.objects.filter(article=a1) |
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120 |
[<Publication: The Python Journal>] |
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|
121 |
|
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122 |
>>> Publication.objects.filter(article__in=[1,2]).distinct() |
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123 |
[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>, <Publication: The Python Journal>] |
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124 |
>>> Publication.objects.filter(article__in=[1,a2]).distinct() |
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125 |
[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>, <Publication: The Python Journal>] |
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126 |
>>> Publication.objects.filter(article__in=[a1,a2]).distinct() |
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127 |
[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>, <Publication: The Python Journal>] |
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|
128 |
|
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129 |
# If we delete a Publication, its Articles won't be able to access it. |
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130 |
>>> p1.delete() |
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131 |
>>> Publication.objects.all() |
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132 |
[<Publication: Highlights for Children>, <Publication: Science News>, <Publication: Science Weekly>] |
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133 |
>>> a1 = Article.objects.get(pk=1) |
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134 |
>>> a1.publications.all() |
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135 |
[] |
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|
136 |
|
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137 |
# If we delete an Article, its Publications won't be able to access it. |
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|
138 |
>>> a2.delete() |
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|
139 |
>>> Article.objects.all() |
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|
140 |
[<Article: Django lets you build Web apps easily>] |
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|
141 |
>>> p2.article_set.all() |
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142 |
[] |
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|
143 |
|
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|
144 |
# Adding via the 'other' end of an m2m |
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145 |
>>> a4 = Article(headline='NASA finds intelligent life on Earth') |
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146 |
>>> a4.save() |
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147 |
>>> p2.article_set.add(a4) |
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148 |
>>> p2.article_set.all() |
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149 |
[<Article: NASA finds intelligent life on Earth>] |
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150 |
>>> a4.publications.all() |
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151 |
[<Publication: Science News>] |
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152 |
|
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153 |
# Adding via the other end using keywords |
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154 |
>>> new_article = p2.article_set.create(headline='Oxygen-free diet works wonders') |
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155 |
>>> p2.article_set.all() |
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156 |
[<Article: NASA finds intelligent life on Earth>, <Article: Oxygen-free diet works wonders>] |
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157 |
>>> a5 = p2.article_set.all()[1] |
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158 |
>>> a5.publications.all() |
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|
159 |
[<Publication: Science News>] |
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|
160 |
|
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|
161 |
# Removing publication from an article: |
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162 |
>>> a4.publications.remove(p2) |
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|
163 |
>>> p2.article_set.all() |
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|
164 |
[<Article: Oxygen-free diet works wonders>] |
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|
165 |
>>> a4.publications.all() |
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|
166 |
[] |
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|
167 |
|
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|
168 |
# And from the other end |
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|
169 |
>>> p2.article_set.remove(a5) |
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|
170 |
>>> p2.article_set.all() |
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|
171 |
[] |
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|
172 |
>>> a5.publications.all() |
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|
173 |
[] |
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|
174 |
|
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|
175 |
# Relation sets can be assigned. Assignment clears any existing set members |
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|
176 |
>>> p2.article_set = [a4, a5] |
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|
177 |
>>> p2.article_set.all() |
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|
178 |
[<Article: NASA finds intelligent life on Earth>, <Article: Oxygen-free diet works wonders>] |
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|
179 |
>>> a4.publications.all() |
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|
180 |
[<Publication: Science News>] |
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|
181 |
>>> a4.publications = [p3] |
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|
182 |
>>> p2.article_set.all() |
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|
183 |
[<Article: Oxygen-free diet works wonders>] |
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|
184 |
>>> a4.publications.all() |
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|
185 |
[<Publication: Science Weekly>] |
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|
186 |
|
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|
187 |
# Relation sets can be cleared: |
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|
188 |
>>> p2.article_set.clear() |
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|
189 |
>>> p2.article_set.all() |
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|
190 |
[] |
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|
191 |
>>> a4.publications.all() |
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|
192 |
[<Publication: Science Weekly>] |
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changeset
|
193 |
|
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|
194 |
# And you can clear from the other end |
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|
195 |
>>> p2.article_set.add(a4, a5) |
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|
196 |
>>> p2.article_set.all() |
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|
197 |
[<Article: NASA finds intelligent life on Earth>, <Article: Oxygen-free diet works wonders>] |
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|
198 |
>>> a4.publications.all() |
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|
199 |
[<Publication: Science News>, <Publication: Science Weekly>] |
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|
200 |
>>> a4.publications.clear() |
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|
201 |
>>> a4.publications.all() |
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|
202 |
[] |
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|
203 |
>>> p2.article_set.all() |
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|
204 |
[<Article: Oxygen-free diet works wonders>] |
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|
205 |
|
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|
206 |
# Relation sets can also be set using primary key values |
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|
207 |
>>> p2.article_set = [a4.id, a5.id] |
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|
208 |
>>> p2.article_set.all() |
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changeset
|
209 |
[<Article: NASA finds intelligent life on Earth>, <Article: Oxygen-free diet works wonders>] |
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changeset
|
210 |
>>> a4.publications.all() |
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|
211 |
[<Publication: Science News>] |
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|
212 |
>>> a4.publications = [p3.id] |
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|
213 |
>>> p2.article_set.all() |
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|
214 |
[<Article: Oxygen-free diet works wonders>] |
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changeset
|
215 |
>>> a4.publications.all() |
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changeset
|
216 |
[<Publication: Science Weekly>] |
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diff
changeset
|
217 |
|
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|
218 |
# Recreate the article and Publication we have deleted. |
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|
219 |
>>> p1 = Publication(id=None, title='The Python Journal') |
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|
220 |
>>> p1.save() |
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>>> a2 = Article(id=None, headline='NASA uses Python') |
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>>> a2.save() |
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>>> a2.publications.add(p1, p2, p3) |
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|
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# Bulk delete some Publications - references to deleted publications should go |
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>>> Publication.objects.filter(title__startswith='Science').delete() |
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>>> Publication.objects.all() |
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[<Publication: Highlights for Children>, <Publication: The Python Journal>] |
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>>> Article.objects.all() |
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[<Article: Django lets you build Web apps easily>, <Article: NASA finds intelligent life on Earth>, <Article: NASA uses Python>, <Article: Oxygen-free diet works wonders>] |
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>>> a2.publications.all() |
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[<Publication: The Python Journal>] |
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|
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# Bulk delete some articles - references to deleted objects should go |
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>>> q = Article.objects.filter(headline__startswith='Django') |
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>>> print q |
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[<Article: Django lets you build Web apps easily>] |
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>>> q.delete() |
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239 |
|
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# After the delete, the QuerySet cache needs to be cleared, and the referenced objects should be gone |
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>>> print q |
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[] |
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>>> p1.article_set.all() |
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[<Article: NASA uses Python>] |
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245 |
|
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# An alternate to calling clear() is to assign the empty set |
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>>> p1.article_set = [] |
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>>> p1.article_set.all() |
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[] |
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|
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>>> a2.publications = [p1, new_publication] |
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>>> a2.publications.all() |
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[<Publication: Highlights for Children>, <Publication: The Python Journal>] |
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>>> a2.publications = [] |
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>>> a2.publications.all() |
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[] |
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|
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"""} |