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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4. Many-to-one relationships |
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To define a many-to-one relationship, use ``ForeignKey()`` . |
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""" |
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from django.db import models |
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class Reporter(models.Model): |
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first_name = models.CharField(maxlength=30) |
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last_name = models.CharField(maxlength=30) |
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email = models.EmailField() |
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def __str__(self): |
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return "%s %s" % (self.first_name, self.last_name) |
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class Article(models.Model): |
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headline = models.CharField(maxlength=100) |
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pub_date = models.DateField() |
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reporter = models.ForeignKey(Reporter) |
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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 few Reporters. |
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>>> r = Reporter(first_name='John', last_name='Smith', email='john@example.com') |
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>>> r.save() |
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>>> r2 = Reporter(first_name='Paul', last_name='Jones', email='paul@example.com') |
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>>> r2.save() |
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# Create an Article. |
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>>> from datetime import datetime |
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>>> a = Article(id=None, headline="This is a test", pub_date=datetime(2005, 7, 27), reporter=r) |
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>>> a.save() |
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>>> a.reporter.id |
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1 |
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>>> a.reporter |
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<Reporter: John Smith> |
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# Article objects have access to their related Reporter objects. |
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>>> r = a.reporter |
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>>> r.first_name, r.last_name |
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('John', 'Smith') |
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# Create an Article via the Reporter object. |
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>>> new_article = r.article_set.create(headline="John's second story", pub_date=datetime(2005, 7, 29)) |
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>>> new_article |
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<Article: John's second story> |
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>>> new_article.reporter.id |
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1 |
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# Create a new article, and add it to the article set. |
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>>> new_article2 = Article(headline="Paul's story", pub_date=datetime(2006, 1, 17)) |
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>>> r.article_set.add(new_article2) |
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>>> new_article2.reporter.id |
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1 |
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>>> r.article_set.all() |
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[<Article: John's second story>, <Article: Paul's story>, <Article: This is a test>] |
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# Add the same article to a different article set - check that it moves. |
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>>> r2.article_set.add(new_article2) |
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>>> new_article2.reporter.id |
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2 |
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>>> r.article_set.all() |
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[<Article: John's second story>, <Article: This is a test>] |
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>>> r2.article_set.all() |
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[<Article: Paul's story>] |
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# Assign the article to the reporter directly using the descriptor |
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>>> new_article2.reporter = r |
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>>> new_article2.save() |
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>>> new_article2.reporter |
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<Reporter: John Smith> |
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>>> new_article2.reporter.id |
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1 |
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>>> r.article_set.all() |
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[<Article: John's second story>, <Article: Paul's story>, <Article: This is a test>] |
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>>> r2.article_set.all() |
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[] |
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# Set the article back again using set descriptor. |
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>>> r2.article_set = [new_article, new_article2] |
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>>> r.article_set.all() |
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[<Article: This is a test>] |
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>>> r2.article_set.all() |
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[<Article: John's second story>, <Article: Paul's story>] |
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|
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# Funny case - assignment notation can only go so far; because the |
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# ForeignKey cannot be null, existing members of the set must remain |
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>>> r.article_set = [new_article] |
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>>> r.article_set.all() |
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[<Article: John's second story>, <Article: This is a test>] |
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>>> r2.article_set.all() |
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[<Article: Paul's story>] |
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|
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# Reporter cannot be null - there should not be a clear or remove method |
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>>> hasattr(r2.article_set, 'remove') |
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False |
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>>> hasattr(r2.article_set, 'clear') |
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False |
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# Reporter objects have access to their related Article objects. |
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>>> r.article_set.all() |
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[<Article: John's second story>, <Article: This is a test>] |
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112 |
|
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113 |
>>> r.article_set.filter(headline__startswith='This') |
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114 |
[<Article: This is a test>] |
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115 |
|
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116 |
>>> r.article_set.count() |
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117 |
2 |
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118 |
|
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119 |
>>> r2.article_set.count() |
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1 |
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121 |
|
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# Get articles by id |
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123 |
>>> Article.objects.filter(id__exact=1) |
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124 |
[<Article: This is a test>] |
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125 |
>>> Article.objects.filter(pk=1) |
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126 |
[<Article: This is a test>] |
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127 |
|
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128 |
# Query on an article property |
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129 |
>>> Article.objects.filter(headline__startswith='This') |
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130 |
[<Article: This is a test>] |
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131 |
|
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132 |
# The API automatically follows relationships as far as you need. |
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# Use double underscores to separate relationships. |
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# This works as many levels deep as you want. There's no limit. |
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# Find all Articles for any Reporter whose first name is "John". |
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>>> Article.objects.filter(reporter__first_name__exact='John') |
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[<Article: John's second story>, <Article: This is a test>] |
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138 |
|
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139 |
# Check that implied __exact also works |
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>>> Article.objects.filter(reporter__first_name='John') |
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141 |
[<Article: John's second story>, <Article: This is a test>] |
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142 |
|
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143 |
# Query twice over the related field. |
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>>> Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith') |
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145 |
[<Article: John's second story>, <Article: This is a test>] |
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146 |
|
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# The underlying query only makes one join when a related table is referenced twice. |
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148 |
>>> query = Article.objects.filter(reporter__first_name__exact='John', reporter__last_name__exact='Smith') |
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149 |
>>> null, sql, null = query._get_sql_clause() |
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150 |
>>> sql.count('INNER JOIN') |
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151 |
1 |
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152 |
|
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153 |
# The automatically joined table has a predictable name. |
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154 |
>>> Article.objects.filter(reporter__first_name__exact='John').extra(where=["many_to_one_article__reporter.last_name='Smith'"]) |
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155 |
[<Article: John's second story>, <Article: This is a test>] |
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156 |
|
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157 |
# Find all Articles for the Reporter whose ID is 1. |
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158 |
# Use direct ID check, pk check, and object comparison |
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159 |
>>> Article.objects.filter(reporter__id__exact=1) |
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160 |
[<Article: John's second story>, <Article: This is a test>] |
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161 |
>>> Article.objects.filter(reporter__pk=1) |
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162 |
[<Article: John's second story>, <Article: This is a test>] |
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163 |
>>> Article.objects.filter(reporter=1) |
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164 |
[<Article: John's second story>, <Article: This is a test>] |
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165 |
>>> Article.objects.filter(reporter=r) |
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166 |
[<Article: John's second story>, <Article: This is a test>] |
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167 |
|
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168 |
>>> Article.objects.filter(reporter__in=[1,2]).distinct() |
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169 |
[<Article: John's second story>, <Article: Paul's story>, <Article: This is a test>] |
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170 |
>>> Article.objects.filter(reporter__in=[r,r2]).distinct() |
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171 |
[<Article: John's second story>, <Article: Paul's story>, <Article: This is a test>] |
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172 |
|
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173 |
# You need two underscores between "reporter" and "id" -- not one. |
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174 |
>>> Article.objects.filter(reporter_id__exact=1) |
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175 |
Traceback (most recent call last): |
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176 |
... |
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177 |
TypeError: Cannot resolve keyword 'reporter_id' into field |
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178 |
|
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179 |
# You need to specify a comparison clause |
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180 |
>>> Article.objects.filter(reporter_id=1) |
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181 |
Traceback (most recent call last): |
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182 |
... |
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183 |
TypeError: Cannot resolve keyword 'reporter_id' into field |
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184 |
|
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185 |
# You can also instantiate an Article by passing |
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186 |
# the Reporter's ID instead of a Reporter object. |
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187 |
>>> a3 = Article(id=None, headline="This is a test", pub_date=datetime(2005, 7, 27), reporter_id=r.id) |
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188 |
>>> a3.save() |
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189 |
>>> a3.reporter.id |
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190 |
1 |
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191 |
>>> a3.reporter |
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192 |
<Reporter: John Smith> |
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193 |
|
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194 |
# Similarly, the reporter ID can be a string. |
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195 |
>>> a4 = Article(id=None, headline="This is a test", pub_date=datetime(2005, 7, 27), reporter_id="1") |
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196 |
>>> a4.save() |
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197 |
>>> a4.reporter |
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198 |
<Reporter: John Smith> |
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199 |
|
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200 |
# Reporters can be queried |
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201 |
>>> Reporter.objects.filter(id__exact=1) |
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202 |
[<Reporter: John Smith>] |
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203 |
>>> Reporter.objects.filter(pk=1) |
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204 |
[<Reporter: John Smith>] |
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205 |
>>> Reporter.objects.filter(first_name__startswith='John') |
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206 |
[<Reporter: John Smith>] |
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207 |
|
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208 |
# Reporters can query in opposite direction of ForeignKey definition |
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209 |
>>> Reporter.objects.filter(article__id__exact=1) |
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210 |
[<Reporter: John Smith>] |
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211 |
>>> Reporter.objects.filter(article__pk=1) |
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212 |
[<Reporter: John Smith>] |
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213 |
>>> Reporter.objects.filter(article=1) |
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214 |
[<Reporter: John Smith>] |
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215 |
>>> Reporter.objects.filter(article=a) |
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216 |
[<Reporter: John Smith>] |
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217 |
|
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218 |
>>> Reporter.objects.filter(article__in=[1,4]).distinct() |
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219 |
[<Reporter: John Smith>] |
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220 |
>>> Reporter.objects.filter(article__in=[1,a3]).distinct() |
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221 |
[<Reporter: John Smith>] |
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>>> Reporter.objects.filter(article__in=[a,a3]).distinct() |
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[<Reporter: John Smith>] |
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|
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>>> Reporter.objects.filter(article__headline__startswith='This') |
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[<Reporter: John Smith>, <Reporter: John Smith>, <Reporter: John Smith>] |
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>>> Reporter.objects.filter(article__headline__startswith='This').distinct() |
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[<Reporter: John Smith>] |
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|
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# Counting in the opposite direction works in conjunction with distinct() |
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>>> Reporter.objects.filter(article__headline__startswith='This').count() |
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3 |
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>>> Reporter.objects.filter(article__headline__startswith='This').distinct().count() |
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1 |
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|
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# Queries can go round in circles. |
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>>> Reporter.objects.filter(article__reporter__first_name__startswith='John') |
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[<Reporter: John Smith>, <Reporter: John Smith>, <Reporter: John Smith>, <Reporter: John Smith>] |
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>>> Reporter.objects.filter(article__reporter__first_name__startswith='John').distinct() |
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[<Reporter: John Smith>] |
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>>> Reporter.objects.filter(article__reporter__exact=r).distinct() |
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[<Reporter: John Smith>] |
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|
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# Check that implied __exact also works |
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>>> Reporter.objects.filter(article__reporter=r).distinct() |
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[<Reporter: John Smith>] |
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|
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# If you delete a reporter, his articles will be deleted. |
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>>> Article.objects.all() |
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[<Article: John's second story>, <Article: Paul's story>, <Article: This is a test>, <Article: This is a test>, <Article: This is a test>] |
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>>> Reporter.objects.order_by('first_name') |
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[<Reporter: John Smith>, <Reporter: Paul Jones>] |
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>>> r2.delete() |
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>>> Article.objects.all() |
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[<Article: John's second story>, <Article: This is a test>, <Article: This is a test>, <Article: This is a test>] |
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>>> Reporter.objects.order_by('first_name') |
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[<Reporter: John Smith>] |
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|
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# Deletes using a join in the query |
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>>> Reporter.objects.filter(article__headline__startswith='This').delete() |
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>>> Reporter.objects.all() |
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[] |
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>>> Article.objects.all() |
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[] |
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|
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"""} |