Well, you're adding choices to q = Question.objects.get(pk=1).
But is this also the question you call the view with?
I suggest you add a few more print statements below your existing
print(question)
For example:
print(question.pk)
print(question.choice_set.all())
# Or, a bit more verbose, for example:
for c in question.choice_set.all():
print(c.pk, c)
# Is the following a valid PK among the choices printed above?
print(request.POST['choice'])
Best regards,
Carsten
Am 2019-02-03 um 16:58 schrieb Atsunori Kaneshige:
> *_Here is the codes about choice_*
>
>
> In [27]: q = Question.objects.get(pk=1)
>
>
> In [28]: q.choice_set.all()
>
> Out[28]: <QuerySet []>
>
>
> In [29]: q.choice_set.create(choice_text='Not much',votes=0)
>
> Out[29]: <Choice: Not much>
>
>
> In [30]: q.choice_set.create(choice_text='The sky',votes=0)
>
> Out[30]: <Choice: The sky>
>
>
> In [31]: c = q.choice_set.create(choice_text='Just hacking again',votes=0)
>
>
> In [32]: c.question
>
> Out[32]: <Question: What's up?>
>
>
> In [33]: q.choice_set.all()
>
> Out[33]: <QuerySet [<Choice: Just hacking again>, <Choice: The sky>, <Choice:
> Not much>]>
>
>
> In [34]: q.choice_set.count()
>
> Out[34]: 3
>
>
>
> choice exits, or correctly working?
>
> Nori
>
> On Sunday, February 3, 2019 at 10:55:48 AM UTC-5, Atsunori Kaneshige wrote:
>
> Hi Carsten,
>
> Sorry, are you talking about Writing Your First App, Part2? The page
> below?
> https://docs.djangoproject.com/en/2.1/intro/tutorial02/
> <https://docs.djangoproject.com/en/2.1/intro/tutorial02/>
>
> Yeah, when I tried this, there was something wrong.
>
> *_I did that again. I copied and pasted my terminal below._*
> *_seems like migration was successful when I did before._*
> *_I am not sure what 'python sqlmigrate polls 001' is doing._*
>
>
> MacBook-Pro-3:mysite Koitaro$ python manage.py migrate
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/psycopg2/__init__.py:144:
> UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in
> order to keep installing from binary please use "pip install psycopg2-binary"
> instead. For details see:
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>>.
>
> """)
>
> Operations to perform:
>
> Apply all migrations: admin, auth, contenttypes, polls, sessions
>
> Running migrations:
>
> No migrations to apply.
>
> MacBook-Pro-3:mysite Koitaro$ python manage.py makemigrations polls
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/psycopg2/__init__.py:144:
> UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in
> order to keep installing from binary please use "pip install psycopg2-binary"
> instead. For details see:
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>>.
>
> """)
>
> No changes detected in app 'polls'
>
> MacBook-Pro-3:mysite Koitaro$ python manage.py sqlmigrate polls 0001
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/psycopg2/__init__.py:144:
> UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in
> order to keep installing from binary please use "pip install psycopg2-binary"
> instead. For details see:
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>>.
>
> """)
>
> BEGIN;
>
> --
>
> -- Create model Choice
>
> --
>
> CREATE TABLE "polls_choice" ("id" serial NOT NULL PRIMARY KEY,
> "choice_text" varchar(200) NOT NULL, "votes" integer NOT NULL);
>
> --
>
> -- Create model Question
>
> --
>
> CREATE TABLE "polls_question" ("id" serial NOT NULL PRIMARY KEY,
> "question_text" varchar(200) NOT NULL, "pub_date" timestamp with time zone
> NOT NULL);
>
> --
>
> -- Add field question to choice
>
> --
>
> ALTER TABLE "polls_choice" ADD COLUMN "question_id" integer NOT NULL;
>
> CREATE INDEX "polls_choice_question_id_c5b4b260" ON "polls_choice"
> ("question_id");
>
> ALTER TABLE "polls_choice" ADD CONSTRAINT
> "polls_choice_question_id_c5b4b260_fk_polls_question_id" FOREIGN KEY
> ("question_id") REFERENCES "polls_question" ("id") DEFERRABLE INITIALLY
> DEFERRED;
>
> COMMIT;
>
> MacBook-Pro-3:mysite Koitaro$
>
>
>
>
> *_After this, when I typed 'python manage.py shell',_*
> *_By the way, I am not doing this in virtual environment, is it fine?_*
> *_Django docs doesn't say anything about it._*
>
> *_Here is the result of shell_*
>
> MacBook-Pro-3:mysite Koitaro$ python manage.py shell
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/psycopg2/__init__.py:144:
> UserWarning: The psycopg2 wheel package will be renamed from release 2.8; in
> order to keep installing from binary please use "pip install psycopg2-binary"
> instead. For details see:
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi
> <http://initd.org/psycopg/docs/install.html#binary-install-from-pypi>>.
>
> """)
>
> Python 3.6.5 |Anaconda, Inc.| (default, Apr 26 2018, 08:42:37)
>
> Type 'copyright', 'credits' or 'license' for more information
>
> IPython 6.4.0 -- An enhanced Interactive Python. Type '?' for help.
>
>
> In [1]: frompolls.modelsimportChoice, Question
>
>
> In [2]: Question.objects.all()
>
> Out[2]: <QuerySet [<Question: What's up?>, <Question: How's going?>,
> <Question: Oh, are you OK?>, <Question: Where is she?>]>
>
>
> In [3]: fromdjango.utilsimporttimezone
>
>
> In [4]: q = Question(question_text='What's up?,pub_data=timezone.now())
>
> File "<ipython-input-4-85ce5789a277>", line 1
>
> q = Question(question_text='What's up?,pub_data=timezone.now())
>
> ^
>
> SyntaxError:invalid syntax
>
>
>
> In [5]: q = Question(question_text="What's up?",pub_data=timezone.now())
>
>
> ---------------------------------------------------------------------------
>
> TypeError Traceback (most recent call last)
>
> <ipython-input-5-bae574063418>in <module>()
>
> ----> 1q =Question(question_text="What's up?",pub_data=timezone.now())
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/base.pyin
> __init__(self, *args, **kwargs)
>
> 483 pass
>
> 484 forkwarg inkwargs:
>
> --> 485 raiseTypeError("'%s' is an invalid keyword
> argument for this function"%kwarg)
>
> 486 super().__init__()
>
> 487 post_init.send(sender=cls,instance=self)
>
>
> TypeError: 'pub_data' is an invalid keyword argument for this function
>
>
> In [6]: q = Question(question_text="What's up?",pub_date=timezone.now())
>
>
> In [7]: q.save()
>
>
> In [8]: q.id <http://q.id>
>
> Out[8]: 5
>
>
> In [9]: q.question_text
>
> Out[9]: "What's up?"
>
>
> In [10]: q.pub_date
>
> Out[10]: datetime.datetime(2019, 2, 3, 15, 43, 10, 354354, tzinfo=<UTC>)
>
>
> In [11]: q.question_text = "What's up?"
>
>
> In [12]: q.save()
>
>
> In [13]: Question.objects.all()
>
> Out[13]: <QuerySet [<Question: What's up?>, <Question: How's going?>,
> <Question: Oh, are you OK?>, <Question: Where is she?>, <Question: What's
> up?>]>
>
>
> In [14]: frompolls.modelsimportChoice, Question
>
>
> In [15]: Question.objects.all()
>
> Out[15]: <QuerySet [<Question: What's up?>, <Question: How's going?>,
> <Question: Oh, are you OK?>, <Question: Where is she?>, <Question: What's
> up?>]>
>
>
> In [16]: Question.objects.filter(question_text_startswith='What')
>
>
> ---------------------------------------------------------------------------
>
> FieldError Traceback (most recent call
> last)
>
> <ipython-input-16-09474b7667e7>in <module>()
>
> ----> 1Question.objects.filter(question_text_startswith='What')
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/manager.pyin
> manager_method(self, *args, **kwargs)
>
> 80 defcreate_method(name,method):
>
> 81 defmanager_method(self,*args,**kwargs):
>
> ---> 82
> returngetattr(self.get_queryset(),name)(*args,**kwargs)
>
> 83 manager_method.__name__ =method.__name__
>
> 84 manager_method.__doc__ =method.__doc__
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/query.pyin
> filter(self, *args, **kwargs)
>
> 842 set.
>
> 843 """
>
> --> 844 returnself._filter_or_exclude(False,*args,**kwargs)
>
> 845
>
> 846 defexclude(self,*args,**kwargs):
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/query.pyin
> _filter_or_exclude(self, negate, *args, **kwargs)
>
> 860 clone.query.add_q(~Q(*args,**kwargs))
>
> 861 else:
>
> --> 862 clone.query.add_q(Q(*args,**kwargs))
>
> 863 returnclone
>
> 864
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.pyin
> add_q(self, q_object)
>
> 1261 # So, demotion is OK.
>
> 1262 existing_inner ={a fora inself.alias_map
> ifself.alias_map[a].join_type ==INNER}
>
> -> 1263 clause,_ =self._add_q(q_object,self.used_aliases)
>
> 1264 ifclause:
>
> 1265 self.where.add(clause,AND)
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.pyin
> _add_q(self, q_object, used_aliases, branch_negated, current_negated,
> allow_joins, split_subq)
>
> 1285
> child,can_reuse=used_aliases,branch_negated=branch_negated,
>
> 1286
> current_negated=current_negated,allow_joins=allow_joins,
>
> -> 1287 split_subq=split_subq,
>
> 1288 )
>
> 1289 joinpromoter.add_votes(needed_inner)
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.pyin
> build_filter(self, filter_expr, branch_negated, current_negated, can_reuse,
> allow_joins, split_subq, reuse_with_filtered_relation)
>
> 1162 ifnotarg:
>
> 1163 raiseFieldError("Cannot parse keyword query %r"%arg)
>
> -> 1164 lookups,parts,reffed_expression
> =self.solve_lookup_type(arg)
>
> 1165
>
> 1166 ifnotgetattr(reffed_expression,'filterable',True):
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.pyin
> solve_lookup_type(self, lookup)
>
> 1026 ifexpression:
>
> 1027 returnexpression_lookups,(),expression
>
> -> 1028 _,field,_,lookup_parts
> =self.names_to_path(lookup_splitted,self.get_meta())
>
> 1029 field_parts
> =lookup_splitted[0:len(lookup_splitted)-len(lookup_parts)]
>
> 1030 iflen(lookup_parts)>1andnotfield_parts:
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/sql/query.pyin
> names_to_path(self, names, opts, allow_many, fail_on_missing)
>
> 1387 )
>
> 1388 raise FieldError("Cannot resolve keyword '%s'
> into field. "
>
> -> 1389 "Choices are: %s" % (name,
> ", ".join(available)))
>
> 1390 break
>
> 1391 # Check if we need any joins for concrete inheritance
> cases (the
>
>
> FieldError: Cannot resolve keyword 'question_text_startswith' into field.
> Choices are: choice, id, pub_date, question_text
>
>
> In [17]: Question.objects.filter(question_text__startswith='What')
>
> Out[17]: <QuerySet [<Question: What's up?>, <Question: What's up?>]>
>
>
> In [18]: fromdjango.utilsimporttimezone
>
>
> In [19]: current_year = timezone.now().year
>
>
> In [20]: Question.objects.get(pub_date__year=current_year)
>
>
> ---------------------------------------------------------------------------
>
> MultipleObjectsReturned Traceback (most recent call last)
>
> <ipython-input-20-05adfe5e79c1>in <module>()
>
> ----> 1Question.objects.get(pub_date__year=current_year)
>
>
>
> /Applications/anaconda3/lib/python3.6/site-packages/django/db/models/manager.pyin
> manager_method(self, *args, **kwargs)
>
> 80 defcreate_method(name,method):
>
> 81 defmanager_method(self,*args,**kwargs):
>
> ---> 82
> returngetattr(self.get_queryset(),name)(*args,<span c
>
> --
--
You received this message because you are subscribed to the Google Groups
"Django users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to django-users+unsubscr...@googlegroups.com.
To post to this group, send email to django-users@googlegroups.com.
Visit this group at https://groups.google.com/group/django-users.
To view this discussion on the web visit
https://groups.google.com/d/msgid/django-users/8307818a-5a45-1b9c-39e4-e1a1d5c88d1a%40cafu.de.
For more options, visit https://groups.google.com/d/optout.
