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: > > 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. 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