CODEWITHSUNDEEP
pythondjango
Juan Carlos Asuncion
Juan Carlos Asuncion

Reputation: 967

Django: Getting foreign key value to show in forms

I have been studying and playing around with django with my test app and I would like to request assistance regarding this matter.

I have the following models:

class Job_Posting(models.Model):
    Job_Position = models.CharField(max_length=30, null=True, unique=True)

    def __unicode__(self):
        return self.Job_Position

class Courses_list(models.Model):
    Abbreviation = models.CharField(max_length=100, unique=True)
    Course = models.CharField(max_length=100, unique=True)

    def __unicode__(self): 
        return self.Abbreviation

class Educational_Requirement(models.Model):
    fkey = models.ForeignKey('Job_Posting')
    Course = models.ForeignKey('Courses_list')

This is pretty much straight forward in the admin, adding job posts and assigning the course required. My problem is with the Educational_Requirement because I am displaying it in my frontend via form's ModelChoiceField and overriding the queryset to display the right choices.

The dropdown display's Educational_Requirement object and I want it to display the value of Course in Educational_Requirement. I can't use __unicode__ in Educational_Requirement as it returns an error:

coercing to Unicode: need string or buffer, Courses_list found

Do I really need to set the __unicode__ in the Educational_Requirement and add the string field? I can't do it because it would really break the purpose of why I did it or is there a better way to implement this? Many thanks.

Feel free to comment if you have any tips for a newbie and it would be greatly appreciated.

Upvotes: 0

Views: 145

Answers (1)

Shang Wang
Shang Wang

Reputation: 25539

If you want to change the display value for ModelChoiceField, you could easily define your own field and override label_from_instance method:

class CourseField(forms.ModelChoiceField):
    def label_from_instance(self, obj):
         # return the field you want to display, which is Course
         return obj.Course

class EducationalRequirementForm(forms.ModelForm):
    Course = CourseField(queryset=Courses_list.objects.all())

Not related, but your are suffering from some poor coding styles. Models are python classes, so they should be like EducationalRequirement. Fields are python class attributes, they should be lower case with underscores like job_position. Check python PEP8 documentation for more code style information.

Upvotes: 1

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