author | Lennard de Rijk <ljvderijk@gmail.com> |
Sun, 12 Jul 2009 12:50:01 +0200 | |
changeset 2608 | d97bafb60f0e |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
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""" |
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7. The lookup API |
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This demonstrates features of the database API. |
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""" |
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from django.db import models |
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class Article(models.Model): |
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headline = models.CharField(maxlength=100) |
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pub_date = models.DateTimeField() |
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class Meta: |
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ordering = ('-pub_date', 'headline') |
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def __str__(self): |
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return self.headline |
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__test__ = {'API_TESTS':r""" |
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# Create a couple of Articles. |
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>>> from datetime import datetime |
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>>> a1 = Article(headline='Article 1', pub_date=datetime(2005, 7, 26)) |
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>>> a1.save() |
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>>> a2 = Article(headline='Article 2', pub_date=datetime(2005, 7, 27)) |
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>>> a2.save() |
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>>> a3 = Article(headline='Article 3', pub_date=datetime(2005, 7, 27)) |
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>>> a3.save() |
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>>> a4 = Article(headline='Article 4', pub_date=datetime(2005, 7, 28)) |
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>>> a4.save() |
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>>> a5 = Article(headline='Article 5', pub_date=datetime(2005, 8, 1, 9, 0)) |
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>>> a5.save() |
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>>> a6 = Article(headline='Article 6', pub_date=datetime(2005, 8, 1, 8, 0)) |
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>>> a6.save() |
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>>> a7 = Article(headline='Article 7', pub_date=datetime(2005, 7, 27)) |
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>>> a7.save() |
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# Each QuerySet gets iterator(), which is a generator that "lazily" returns |
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# results using database-level iteration. |
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>>> for a in Article.objects.iterator(): |
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... print a.headline |
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Article 5 |
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Article 6 |
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Article 4 |
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Article 2 |
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Article 3 |
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Article 7 |
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Article 1 |
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# iterator() can be used on any QuerySet. |
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>>> for a in Article.objects.filter(headline__endswith='4').iterator(): |
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... print a.headline |
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Article 4 |
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# count() returns the number of objects matching search criteria. |
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>>> Article.objects.count() |
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7L |
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>>> Article.objects.filter(pub_date__exact=datetime(2005, 7, 27)).count() |
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3L |
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>>> Article.objects.filter(headline__startswith='Blah blah').count() |
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0L |
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|
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# count() should respect sliced query sets. |
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>>> articles = Article.objects.all() |
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>>> articles.count() |
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7L |
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>>> articles[:4].count() |
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4 |
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>>> articles[1:100].count() |
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6L |
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>>> articles[10:100].count() |
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0 |
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# Date and date/time lookups can also be done with strings. |
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>>> Article.objects.filter(pub_date__exact='2005-07-27 00:00:00').count() |
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3L |
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# in_bulk() takes a list of IDs and returns a dictionary mapping IDs |
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# to objects. |
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>>> Article.objects.in_bulk([1, 2]) |
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{1: <Article: Article 1>, 2: <Article: Article 2>} |
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>>> Article.objects.in_bulk([3]) |
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{3: <Article: Article 3>} |
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>>> Article.objects.in_bulk([1000]) |
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{} |
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>>> Article.objects.in_bulk([]) |
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{} |
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>>> Article.objects.in_bulk('foo') |
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Traceback (most recent call last): |
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... |
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AssertionError: in_bulk() must be provided with a list of IDs. |
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>>> Article.objects.in_bulk() |
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Traceback (most recent call last): |
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... |
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TypeError: in_bulk() takes exactly 2 arguments (1 given) |
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>>> Article.objects.in_bulk(headline__startswith='Blah') |
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Traceback (most recent call last): |
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... |
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TypeError: in_bulk() got an unexpected keyword argument 'headline__startswith' |
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|
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# values() returns a list of dictionaries instead of object instances -- and |
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# you can specify which fields you want to retrieve. |
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>>> Article.objects.values('headline') |
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[{'headline': 'Article 5'}, {'headline': 'Article 6'}, {'headline': 'Article 4'}, {'headline': 'Article 2'}, {'headline': 'Article 3'}, {'headline': 'Article 7'}, {'headline': 'Article 1'}] |
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>>> Article.objects.filter(pub_date__exact=datetime(2005, 7, 27)).values('id') |
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[{'id': 2}, {'id': 3}, {'id': 7}] |
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>>> list(Article.objects.values('id', 'headline')) == [{'id': 5, 'headline': 'Article 5'}, {'id': 6, 'headline': 'Article 6'}, {'id': 4, 'headline': 'Article 4'}, {'id': 2, 'headline': 'Article 2'}, {'id': 3, 'headline': 'Article 3'}, {'id': 7, 'headline': 'Article 7'}, {'id': 1, 'headline': 'Article 1'}] |
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True |
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>>> for d in Article.objects.values('id', 'headline'): |
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... i = d.items() |
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110 |
... i.sort() |
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111 |
... i |
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112 |
[('headline', 'Article 5'), ('id', 5)] |
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113 |
[('headline', 'Article 6'), ('id', 6)] |
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114 |
[('headline', 'Article 4'), ('id', 4)] |
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115 |
[('headline', 'Article 2'), ('id', 2)] |
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116 |
[('headline', 'Article 3'), ('id', 3)] |
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117 |
[('headline', 'Article 7'), ('id', 7)] |
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118 |
[('headline', 'Article 1'), ('id', 1)] |
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119 |
|
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120 |
# You can use values() with iterator() for memory savings, because iterator() |
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121 |
# uses database-level iteration. |
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122 |
>>> for d in Article.objects.values('id', 'headline').iterator(): |
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123 |
... i = d.items() |
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... i.sort() |
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125 |
... i |
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126 |
[('headline', 'Article 5'), ('id', 5)] |
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[('headline', 'Article 6'), ('id', 6)] |
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[('headline', 'Article 4'), ('id', 4)] |
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[('headline', 'Article 2'), ('id', 2)] |
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[('headline', 'Article 3'), ('id', 3)] |
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[('headline', 'Article 7'), ('id', 7)] |
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[('headline', 'Article 1'), ('id', 1)] |
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|
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# if you don't specify which fields, all are returned |
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135 |
>>> list(Article.objects.filter(id=5).values()) == [{'id': 5, 'headline': 'Article 5', 'pub_date': datetime(2005, 8, 1, 9, 0)}] |
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136 |
True |
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137 |
|
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138 |
# Every DateField and DateTimeField creates get_next_by_FOO() and |
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# get_previous_by_FOO() methods. |
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# In the case of identical date values, these methods will use the ID as a |
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# fallback check. This guarantees that no records are skipped or duplicated. |
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142 |
>>> a1.get_next_by_pub_date() |
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143 |
<Article: Article 2> |
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>>> a2.get_next_by_pub_date() |
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145 |
<Article: Article 3> |
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146 |
>>> a2.get_next_by_pub_date(headline__endswith='6') |
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147 |
<Article: Article 6> |
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148 |
>>> a3.get_next_by_pub_date() |
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149 |
<Article: Article 7> |
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150 |
>>> a4.get_next_by_pub_date() |
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151 |
<Article: Article 6> |
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152 |
>>> a5.get_next_by_pub_date() |
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153 |
Traceback (most recent call last): |
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154 |
... |
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155 |
DoesNotExist: Article matching query does not exist. |
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156 |
>>> a6.get_next_by_pub_date() |
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157 |
<Article: Article 5> |
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158 |
>>> a7.get_next_by_pub_date() |
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159 |
<Article: Article 4> |
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160 |
|
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161 |
>>> a7.get_previous_by_pub_date() |
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162 |
<Article: Article 3> |
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163 |
>>> a6.get_previous_by_pub_date() |
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164 |
<Article: Article 4> |
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165 |
>>> a5.get_previous_by_pub_date() |
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166 |
<Article: Article 6> |
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167 |
>>> a4.get_previous_by_pub_date() |
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168 |
<Article: Article 7> |
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169 |
>>> a3.get_previous_by_pub_date() |
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170 |
<Article: Article 2> |
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171 |
>>> a2.get_previous_by_pub_date() |
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172 |
<Article: Article 1> |
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173 |
|
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174 |
# Underscores and percent signs have special meaning in the underlying |
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175 |
# SQL code, but Django handles the quoting of them automatically. |
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176 |
>>> a8 = Article(headline='Article_ with underscore', pub_date=datetime(2005, 11, 20)) |
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177 |
>>> a8.save() |
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178 |
>>> Article.objects.filter(headline__startswith='Article') |
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179 |
[<Article: Article_ with underscore>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>] |
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180 |
>>> Article.objects.filter(headline__startswith='Article_') |
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181 |
[<Article: Article_ with underscore>] |
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182 |
|
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183 |
>>> a9 = Article(headline='Article% with percent sign', pub_date=datetime(2005, 11, 21)) |
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184 |
>>> a9.save() |
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185 |
>>> Article.objects.filter(headline__startswith='Article') |
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186 |
[<Article: Article% with percent sign>, <Article: Article_ with underscore>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>] |
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187 |
>>> Article.objects.filter(headline__startswith='Article%') |
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|
188 |
[<Article: Article% with percent sign>] |
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|
189 |
|
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|
190 |
# exclude() is the opposite of filter() when doing lookups: |
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|
191 |
>>> Article.objects.filter(headline__contains='Article').exclude(headline__contains='with') |
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192 |
[<Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>] |
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193 |
>>> Article.objects.exclude(headline__startswith="Article_") |
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194 |
[<Article: Article% with percent sign>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>] |
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195 |
>>> Article.objects.exclude(headline="Article 7") |
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196 |
[<Article: Article% with percent sign>, <Article: Article_ with underscore>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 1>] |
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|
197 |
|
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198 |
# Backslashes also have special meaning in the underlying SQL code, but Django |
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199 |
# automatically quotes them appropriately. |
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200 |
>>> a10 = Article(headline='Article with \\ backslash', pub_date=datetime(2005, 11, 22)) |
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201 |
>>> a10.save() |
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202 |
>>> Article.objects.filter(headline__contains='\\') |
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203 |
[<Article: Article with \ backslash>] |
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204 |
|
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|
205 |
# none() returns an EmptyQuerySet that behaves like any other QuerySet object |
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206 |
>>> Article.objects.none() |
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207 |
[] |
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208 |
>>> Article.objects.none().filter(headline__startswith='Article') |
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209 |
[] |
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210 |
>>> Article.objects.none().count() |
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211 |
0 |
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212 |
>>> [article for article in Article.objects.none().iterator()] |
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213 |
[] |
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|
214 |
|
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|
215 |
# using __in with an empty list should return an empty query set |
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216 |
>>> Article.objects.filter(id__in=[]) |
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[] |
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>>> Article.objects.exclude(id__in=[]) |
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[<Article: Article with \ backslash>, <Article: Article% with percent sign>, <Article: Article_ with underscore>, <Article: Article 5>, <Article: Article 6>, <Article: Article 4>, <Article: Article 2>, <Article: Article 3>, <Article: Article 7>, <Article: Article 1>] |
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# Programming errors are pointed out with nice error messages |
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>>> Article.objects.filter(pub_date_year='2005').count() |
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Traceback (most recent call last): |
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... |
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TypeError: Cannot resolve keyword 'pub_date_year' into field |
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>>> Article.objects.filter(headline__starts='Article') |
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Traceback (most recent call last): |
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... |
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TypeError: Cannot resolve keyword 'headline__starts' into field |
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"""} |