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POautopopulating child table related by OneToOne in Django
 

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  1. POautopopulating child table related by OneToOne in Django
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    <p>I'm pretty new to django, and I'm having trouble with a child table that is an extension of Django's built User model at django.contrib.auth.model. The child table is UserProfile, and inherits from User. (see below for my models)</p> <p>I can't really figure out how to put data in these tables except by the admin site, which clearly isn't good enough. </p> <p>I'll get my user object and assign it some variable say, <code>u = User.objects.get(username = 'jane_smith'</code> then try and reach the data in the child table with the command <code>up = u.userprofile</code>. I'm rewarded with the following error: <code>DoesNotExist: UserProfile matching query does not exist.</code></p> <p>I experimented getting around the problem by manually inputting data through the terminal, with <code>up = UserProfile(user_ptr = User.objects.get(username = 'jane_smith'), country = 'USA', num_meals_hosted = 0, cook_rating = 5, image = None, zipcode =91011)</code> followed by <code>up.save()</code></p> <p>However, I got the following stack trace</p> <pre><code>&gt;&gt;&gt; up.save() Traceback (most recent call last): File "&lt;console&gt;", line 1, in &lt;module&gt; File "/Library/Python/2.6/site-packages/django/db/models/base.py", line 460, in save self.save_base(using=using, force_insert=force_insert, force_update=force_update) File "/Library/Python/2.6/site-packages/django/db/models/base.py", line 504, in save_base self.save_base(cls=parent, origin=org, using=using) File "/Library/Python/2.6/site-packages/django/db/models/base.py", line 526, in save_base rows = manager.using(using).filter(pk=pk_val)._update(values) File "/Library/Python/2.6/site-packages/django/db/models/query.py", line 491, in _update return query.get_compiler(self.db).execute_sql(None) File "/Library/Python/2.6/site-packages/django/db/models/sql/compiler.py", line 869, in execute_sql cursor = super(SQLUpdateCompiler, self).execute_sql(result_type) File "/Library/Python/2.6/site-packages/django/db/models/sql/compiler.py", line 735, in execute_sql cursor.execute(sql, params) File "/Library/Python/2.6/site-packages/django/db/backends/util.py", line 34, in execute return self.cursor.execute(sql, params) File "/Library/Python/2.6/site-packages/django/db/backends/mysql/base.py", line 86, in execute return self.cursor.execute(query, args) File "build/bdist.macosx-10.6-universal/egg/MySQLdb/cursors.py", line 174, in execute self.errorhandler(self, exc, value) File "build/bdist.macosx-10.6-universal/egg/MySQLdb/connections.py", line 36, in defaulterrorhandler raise errorclass, errorvalue IntegrityError: (1062, "Duplicate entry '' for key 'username'") </code></pre> <p>Anyone help? Just want to find a way to put data in these tables through the API. Below are my models. Happy to post more info in comments if needed.</p> <pre><code>from django.db import models from django.contrib.auth.models import User class UserProfile(User): address = models.CharField(max_length=100, blank=True) city = models.CharField(max_length = 50, blank=True) state = models.CharField(max_length = 15, blank=True) zipcode = models.IntegerField(blank=True) country = models.CharField(max_length = 50, blank=True) num_meals_hosted = models.IntegerField() cook_rating = models.IntegerField() diet_restrict = models.CharField(max_length = 600, blank=True) blurb = models.CharField(max_length = 10000, blank=True) website = models.URLField(blank=True) image_height = models.IntegerField(blank = True) image_width = models.IntegerField(blank = True) def __unicode__(self): return self.id </code></pre>
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    1. COYour title mentions OneToOne relationships, but in fact this is inheritance. Don't use that, use a standard OneToOne.
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      1. USDaniel Roseman
    2. CO@Daniel: Could you please help me understand why? I had it like that earlier, but it didn't seem to solve the problem either.
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    3. COFor exactly the reason you show. If you have a standard relationship, you can create the Profile side separately from the User. With inheritance, you can't (without some painful hacking). If you're having problems with OneToOnes, ask a separate question.
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