Hi Carsten,
-- Thank you!
I finally understood what's happening.
I should have added choices into each question.
Now, choice_set.all thing is working!
Thank you for your advice!
Nori
On Sunday, February 3, 2019 at 3:20:39 PM UTC-5, Carsten Fuchs wrote:
On Sunday, February 3, 2019 at 3:20:39 PM UTC-5, Carsten Fuchs wrote:
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- <http://initd.org/psycopg/install-from-pypi 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- <http://initd.org/psycopg/install-from-pypi 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- <http://initd.org/psycopg/install-from-pypi 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- <http://initd.org/psycopg/install-from-pypi 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
>
> --
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