author | Daniel Diniz <ajaksu@gmail.com> |
Fri, 03 Jul 2009 12:10:24 +0200 | |
changeset 2500 | ecc16ffe174b |
parent 109 | 620f9b141567 |
permissions | -rwxr-xr-x |
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""" |
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10. One-to-one relationships |
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To define a one-to-one relationship, use ``OneToOneField()``. |
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In this example, a ``Place`` optionally can be a ``Restaurant``. |
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""" |
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from django.db import models |
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class Place(models.Model): |
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name = models.CharField(maxlength=50) |
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address = models.CharField(maxlength=80) |
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def __str__(self): |
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return "%s the place" % self.name |
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class Restaurant(models.Model): |
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place = models.OneToOneField(Place) |
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serves_hot_dogs = models.BooleanField() |
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serves_pizza = models.BooleanField() |
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def __str__(self): |
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return "%s the restaurant" % self.place.name |
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class Waiter(models.Model): |
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restaurant = models.ForeignKey(Restaurant) |
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name = models.CharField(maxlength=50) |
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def __str__(self): |
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return "%s the waiter at %s" % (self.name, self.restaurant) |
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class ManualPrimaryKey(models.Model): |
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primary_key = models.CharField(maxlength=10, primary_key=True) |
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name = models.CharField(maxlength = 50) |
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class RelatedModel(models.Model): |
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link = models.OneToOneField(ManualPrimaryKey) |
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name = models.CharField(maxlength = 50) |
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__test__ = {'API_TESTS':""" |
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# Create a couple of Places. |
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>>> p1 = Place(name='Demon Dogs', address='944 W. Fullerton') |
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>>> p1.save() |
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>>> p2 = Place(name='Ace Hardware', address='1013 N. Ashland') |
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>>> p2.save() |
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# Create a Restaurant. Pass the ID of the "parent" object as this object's ID. |
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>>> r = Restaurant(place=p1, serves_hot_dogs=True, serves_pizza=False) |
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>>> r.save() |
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# A Restaurant can access its place. |
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>>> r.place |
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<Place: Demon Dogs the place> |
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# A Place can access its restaurant, if available. |
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>>> p1.restaurant |
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<Restaurant: Demon Dogs the restaurant> |
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# p2 doesn't have an associated restaurant. |
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>>> p2.restaurant |
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Traceback (most recent call last): |
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... |
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DoesNotExist: Restaurant matching query does not exist. |
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# Set the place using assignment notation. Because place is the primary key on Restaurant, |
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# the save will create a new restaurant |
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>>> r.place = p2 |
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>>> r.save() |
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>>> p2.restaurant |
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<Restaurant: Ace Hardware the restaurant> |
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>>> r.place |
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<Place: Ace Hardware the place> |
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# Set the place back again, using assignment in the reverse direction |
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# Need to reget restaurant object first, because the reverse set |
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# can't update the existing restaurant instance |
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>>> p1.restaurant = r |
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>>> r.save() |
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>>> p1.restaurant |
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<Restaurant: Demon Dogs the restaurant> |
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>>> r = Restaurant.objects.get(pk=1) |
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>>> r.place |
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<Place: Demon Dogs the place> |
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# Restaurant.objects.all() just returns the Restaurants, not the Places. |
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# Note that there are two restaurants - Ace Hardware the Restaurant was created |
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# in the call to r.place = p2. This means there are multiple restaurants referencing |
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# a single place... |
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>>> Restaurant.objects.all() |
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[<Restaurant: Demon Dogs the restaurant>, <Restaurant: Ace Hardware the restaurant>] |
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# Place.objects.all() returns all Places, regardless of whether they have |
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# Restaurants. |
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>>> Place.objects.order_by('name') |
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[<Place: Ace Hardware the place>, <Place: Demon Dogs the place>] |
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>>> Restaurant.objects.get(place__id__exact=1) |
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<Restaurant: Demon Dogs the restaurant> |
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>>> Restaurant.objects.get(pk=1) |
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<Restaurant: Demon Dogs the restaurant> |
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>>> Restaurant.objects.get(place__exact=1) |
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<Restaurant: Demon Dogs the restaurant> |
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>>> Restaurant.objects.get(place__exact=p1) |
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<Restaurant: Demon Dogs the restaurant> |
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>>> Restaurant.objects.get(place=1) |
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<Restaurant: Demon Dogs the restaurant> |
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>>> Restaurant.objects.get(place=p1) |
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<Restaurant: Demon Dogs the restaurant> |
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>>> Restaurant.objects.get(place__pk=1) |
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<Restaurant: Demon Dogs the restaurant> |
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113 |
>>> Restaurant.objects.get(place__name__startswith="Demon") |
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114 |
<Restaurant: Demon Dogs the restaurant> |
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115 |
|
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116 |
>>> Place.objects.get(id__exact=1) |
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117 |
<Place: Demon Dogs the place> |
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118 |
>>> Place.objects.get(pk=1) |
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119 |
<Place: Demon Dogs the place> |
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120 |
>>> Place.objects.get(restaurant__place__exact=1) |
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121 |
<Place: Demon Dogs the place> |
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122 |
>>> Place.objects.get(restaurant__place__exact=p1) |
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123 |
<Place: Demon Dogs the place> |
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124 |
>>> Place.objects.get(restaurant__pk=1) |
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125 |
<Place: Demon Dogs the place> |
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126 |
>>> Place.objects.get(restaurant=1) |
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127 |
<Place: Demon Dogs the place> |
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128 |
>>> Place.objects.get(restaurant=r) |
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129 |
<Place: Demon Dogs the place> |
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130 |
>>> Place.objects.get(restaurant__exact=1) |
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131 |
<Place: Demon Dogs the place> |
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132 |
>>> Place.objects.get(restaurant__exact=r) |
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133 |
<Place: Demon Dogs the place> |
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134 |
|
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135 |
# Add a Waiter to the Restaurant. |
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136 |
>>> w = r.waiter_set.create(name='Joe') |
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137 |
>>> w.save() |
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138 |
>>> w |
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139 |
<Waiter: Joe the waiter at Demon Dogs the restaurant> |
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140 |
|
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141 |
# Query the waiters |
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142 |
>>> Waiter.objects.filter(restaurant__place__pk=1) |
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143 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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144 |
>>> Waiter.objects.filter(restaurant__place__exact=1) |
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145 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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146 |
>>> Waiter.objects.filter(restaurant__place__exact=p1) |
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147 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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148 |
>>> Waiter.objects.filter(restaurant__pk=1) |
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149 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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150 |
>>> Waiter.objects.filter(id__exact=1) |
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151 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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152 |
>>> Waiter.objects.filter(pk=1) |
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153 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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154 |
>>> Waiter.objects.filter(restaurant=1) |
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155 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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156 |
>>> Waiter.objects.filter(restaurant=r) |
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157 |
[<Waiter: Joe the waiter at Demon Dogs the restaurant>] |
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158 |
|
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159 |
# Delete the restaurant; the waiter should also be removed |
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160 |
>>> r = Restaurant.objects.get(pk=1) |
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161 |
>>> r.delete() |
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162 |
|
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163 |
# One-to-one fields still work if you create your own primary key |
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164 |
>>> o1 = ManualPrimaryKey(primary_key="abc123", name="primary") |
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165 |
>>> o1.save() |
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166 |
>>> o2 = RelatedModel(link=o1, name="secondary") |
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167 |
>>> o2.save() |
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168 |
"""} |