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Python Customizing the Django Admin Customizing the List View Test: Custom Filters

Thiago Oliveria
Thiago Oliveria
137 Points
Posted by Thiago Oliveria
Thiago Oliveria
137 Points

The queryset() method needs to call filter() on its 'queryset' argument.

i believe my code is right , i can't understand the message of the error:

"The queryset() method needs to call filter() on its 'queryset' argument." because , i use queryset argument in method with filter , but keep show the error i look in documentation the django and looks like right ...

Can someone show me when is my error ? or this is a bug ?

courses/admin.py 
from django.contrib import admin

from . import models

class TextInline(admin.StackedInline):
    model = models.Text

class QuizInline(admin.StackedInline):
    model = models.Quiz

class AnswerInline(admin.StackedInline):
    model = models.Answer

class TopicListFilter(admin.SimpleListFilter):
    title = 'topic'
    parameter_name = 'topic'


    def lookups(self, request, admin_model):
        return (
            ('Python', 'Python'),
            ('Ruby', 'Ruby'),
            ('Java', 'Java'),
        )

    def queryset(self, request, queryset): 
        if self.value() ==  'Python': 
            return self.queryset.filter(title__contains='Python')
        if self.value() ==  'Ruby': 
            return self.queryset.filter(title__contains='Ruby')
        if self.value() ==  'Java': 
            return self.queryset.filter(title__contains='Java')

class CourseAdmin(admin.ModelAdmin):
    inlines = [TextInline, QuizInline]

    list_filter = ['created_at', 'is_live']

admin.site.register(models.Course, CourseAdmin)

1 Answer

Chris Freeman
MOD
Chris Freeman
Treehouse Moderator 68,423 Points
Chris Freeman
Chris Freeman
Treehouse Moderator 68,423 Points

The error is not in the code specifically. The challenge is looking for lowercase words. Also, the self. prefix should not be used in this case since queryset is not an attribute of the class, but rather an argument to the method.

    def queryset(self, request, queryset): 
        if self.value() ==  'python': 
            return queryset.filter(title__contains='python')
        if self.value() ==  'ruby': 
            return queryset.filter(title__contains='ruby')
        if self.value() ==  'java': 
            return queryset.filter(title__contains='java')