Referring from the “many” field to the “one” in Django











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A noob question.
I have followed the official Django tutorial and I have the following:



class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')

def __str__(self):
return self.question_text

class Choice(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)

def __str__(self):
return self.choice_text


I have tried replacing the Choice.str() code as follows:



def __str__(self):
return 'Choice for Q: {}'.format(Question.objects.get(pk=self.question_id_id).__str__())


I am trying to view the question related to this choise (when viewed in the admin).
The code doesn't work. What is the correct way of doing this?



Many thanks.










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  • What's wrong with self.question?
    – thebjorn
    Nov 7 at 19:19










  • This could be clarified if you try some of these things in the Django shell. If you load up a Choice object, call it c, you can call print(c.question) to see what happens. You can also try print(c.question_id_id), which should result in an error, and print(c.question_id), which should result in the ID of the related question, a.k.a. c.question.id.
    – kungphu
    Nov 8 at 5:34















up vote
0
down vote

favorite












A noob question.
I have followed the official Django tutorial and I have the following:



class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')

def __str__(self):
return self.question_text

class Choice(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)

def __str__(self):
return self.choice_text


I have tried replacing the Choice.str() code as follows:



def __str__(self):
return 'Choice for Q: {}'.format(Question.objects.get(pk=self.question_id_id).__str__())


I am trying to view the question related to this choise (when viewed in the admin).
The code doesn't work. What is the correct way of doing this?



Many thanks.










share|improve this question
























  • What's wrong with self.question?
    – thebjorn
    Nov 7 at 19:19










  • This could be clarified if you try some of these things in the Django shell. If you load up a Choice object, call it c, you can call print(c.question) to see what happens. You can also try print(c.question_id_id), which should result in an error, and print(c.question_id), which should result in the ID of the related question, a.k.a. c.question.id.
    – kungphu
    Nov 8 at 5:34













up vote
0
down vote

favorite









up vote
0
down vote

favorite











A noob question.
I have followed the official Django tutorial and I have the following:



class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')

def __str__(self):
return self.question_text

class Choice(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)

def __str__(self):
return self.choice_text


I have tried replacing the Choice.str() code as follows:



def __str__(self):
return 'Choice for Q: {}'.format(Question.objects.get(pk=self.question_id_id).__str__())


I am trying to view the question related to this choise (when viewed in the admin).
The code doesn't work. What is the correct way of doing this?



Many thanks.










share|improve this question















A noob question.
I have followed the official Django tutorial and I have the following:



class Question(models.Model):
question_text = models.CharField(max_length=200)
pub_date = models.DateTimeField('date published')

def __str__(self):
return self.question_text

class Choice(models.Model):
question = models.ForeignKey(Question, on_delete=models.CASCADE)
choice_text = models.CharField(max_length=200)
votes = models.IntegerField(default=0)

def __str__(self):
return self.choice_text


I have tried replacing the Choice.str() code as follows:



def __str__(self):
return 'Choice for Q: {}'.format(Question.objects.get(pk=self.question_id_id).__str__())


I am trying to view the question related to this choise (when viewed in the admin).
The code doesn't work. What is the correct way of doing this?



Many thanks.







django django-models






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 7 at 19:13

























asked Nov 7 at 19:07









Ammar Al-Taweel

33




33












  • What's wrong with self.question?
    – thebjorn
    Nov 7 at 19:19










  • This could be clarified if you try some of these things in the Django shell. If you load up a Choice object, call it c, you can call print(c.question) to see what happens. You can also try print(c.question_id_id), which should result in an error, and print(c.question_id), which should result in the ID of the related question, a.k.a. c.question.id.
    – kungphu
    Nov 8 at 5:34


















  • What's wrong with self.question?
    – thebjorn
    Nov 7 at 19:19










  • This could be clarified if you try some of these things in the Django shell. If you load up a Choice object, call it c, you can call print(c.question) to see what happens. You can also try print(c.question_id_id), which should result in an error, and print(c.question_id), which should result in the ID of the related question, a.k.a. c.question.id.
    – kungphu
    Nov 8 at 5:34
















What's wrong with self.question?
– thebjorn
Nov 7 at 19:19




What's wrong with self.question?
– thebjorn
Nov 7 at 19:19












This could be clarified if you try some of these things in the Django shell. If you load up a Choice object, call it c, you can call print(c.question) to see what happens. You can also try print(c.question_id_id), which should result in an error, and print(c.question_id), which should result in the ID of the related question, a.k.a. c.question.id.
– kungphu
Nov 8 at 5:34




This could be clarified if you try some of these things in the Django shell. If you load up a Choice object, call it c, you can call print(c.question) to see what happens. You can also try print(c.question_id_id), which should result in an error, and print(c.question_id), which should result in the ID of the related question, a.k.a. c.question.id.
– kungphu
Nov 8 at 5:34












2 Answers
2






active

oldest

votes

















up vote
0
down vote



accepted










Firstly, you don't need to do an extra query inside the str method.
Secondly, the string formatting needs a string. You are passing a Question object's str method, that is you're basically passing a reference for this function object (Yes, everything is an object in python)



This snippet should solve your issue.



def __str__(self):
return 'Choice for Q: {}'.format(str(self.question.id))





share|improve this answer























  • While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
    – Roy Scheffers
    Nov 8 at 0:43










  • Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
    – Ammar Al-Taweel
    Nov 8 at 12:29




















up vote
-1
down vote













Try this



def __str__(self):
return 'Choice for Q: {}'.format(self.question.__str__())





share|improve this answer

















  • 1




    You don't need the last .__str__()
    – thebjorn
    Nov 7 at 19:40











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes








up vote
0
down vote



accepted










Firstly, you don't need to do an extra query inside the str method.
Secondly, the string formatting needs a string. You are passing a Question object's str method, that is you're basically passing a reference for this function object (Yes, everything is an object in python)



This snippet should solve your issue.



def __str__(self):
return 'Choice for Q: {}'.format(str(self.question.id))





share|improve this answer























  • While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
    – Roy Scheffers
    Nov 8 at 0:43










  • Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
    – Ammar Al-Taweel
    Nov 8 at 12:29

















up vote
0
down vote



accepted










Firstly, you don't need to do an extra query inside the str method.
Secondly, the string formatting needs a string. You are passing a Question object's str method, that is you're basically passing a reference for this function object (Yes, everything is an object in python)



This snippet should solve your issue.



def __str__(self):
return 'Choice for Q: {}'.format(str(self.question.id))





share|improve this answer























  • While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
    – Roy Scheffers
    Nov 8 at 0:43










  • Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
    – Ammar Al-Taweel
    Nov 8 at 12:29















up vote
0
down vote



accepted







up vote
0
down vote



accepted






Firstly, you don't need to do an extra query inside the str method.
Secondly, the string formatting needs a string. You are passing a Question object's str method, that is you're basically passing a reference for this function object (Yes, everything is an object in python)



This snippet should solve your issue.



def __str__(self):
return 'Choice for Q: {}'.format(str(self.question.id))





share|improve this answer














Firstly, you don't need to do an extra query inside the str method.
Secondly, the string formatting needs a string. You are passing a Question object's str method, that is you're basically passing a reference for this function object (Yes, everything is an object in python)



This snippet should solve your issue.



def __str__(self):
return 'Choice for Q: {}'.format(str(self.question.id))






share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 8 at 18:45

























answered Nov 7 at 21:52









Mehran

218110




218110












  • While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
    – Roy Scheffers
    Nov 8 at 0:43










  • Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
    – Ammar Al-Taweel
    Nov 8 at 12:29




















  • While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
    – Roy Scheffers
    Nov 8 at 0:43










  • Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
    – Ammar Al-Taweel
    Nov 8 at 12:29


















While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
– Roy Scheffers
Nov 8 at 0:43




While this might answer the authors' question, it lacks some explaining words and/or links to documentation. Raw code snippets are not very helpful without some phrases around them. You may also find how to write a good answer very helpful. Please edit your answer.
– Roy Scheffers
Nov 8 at 0:43












Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
– Ammar Al-Taweel
Nov 8 at 12:29






Thanks for the simple answer. It did need an extra ')' at the end. The reason I couldn't see this simple answer before is that I added the following line in the str function: import ipdb;ipdb.set_trace() Then I tried to print the available fields in 'self' by typing: pp self.__dict__ that gave me: {'_state': <django.db.models.base.ModelState object at 0x000001E565FCBFD0>, 'choice_text': 'Everything', 'id': 2, 'question_id': 1, 'votes': 0} So I couldn't see how the Choice will refer back to the question. It seems I was over complicating a simple issue.
– Ammar Al-Taweel
Nov 8 at 12:29














up vote
-1
down vote













Try this



def __str__(self):
return 'Choice for Q: {}'.format(self.question.__str__())





share|improve this answer

















  • 1




    You don't need the last .__str__()
    – thebjorn
    Nov 7 at 19:40















up vote
-1
down vote













Try this



def __str__(self):
return 'Choice for Q: {}'.format(self.question.__str__())





share|improve this answer

















  • 1




    You don't need the last .__str__()
    – thebjorn
    Nov 7 at 19:40













up vote
-1
down vote










up vote
-1
down vote









Try this



def __str__(self):
return 'Choice for Q: {}'.format(self.question.__str__())





share|improve this answer












Try this



def __str__(self):
return 'Choice for Q: {}'.format(self.question.__str__())






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 7 at 19:29









some_code

1144




1144








  • 1




    You don't need the last .__str__()
    – thebjorn
    Nov 7 at 19:40














  • 1




    You don't need the last .__str__()
    – thebjorn
    Nov 7 at 19:40








1




1




You don't need the last .__str__()
– thebjorn
Nov 7 at 19:40




You don't need the last .__str__()
– thebjorn
Nov 7 at 19:40


















 

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