Post、Categoryの二つのmodelがあります。
python
1 #Category 2 class Category(models.Model): 310 411 name=models.CharField(max_length=255) 512 613 def __str__(self): 714 return self.name 815 921 def get_or_create_curry_category(): 1022 category_list=["プログラミング", "料理", "映画", "制作物"] 1123 for i in category_list : 1224 category, _ = Category.objects.get_or_create(name=i ) 1325 return category 14 #Post 15 class Post(models.Model): 16 category=models.ForeignKey( 1747 Category, verbose_name="カテゴリ", on_delete=models.CASCADE, 1848 default=get_or_create_curry_category, 1949 )
python manage.py shell をしてシェルを立ち上げます。
python
1# shell 2>>> from django.db import models 3>>> from blog.models import Post, Category 4>>>Post.objects.filter(category='制作物')
とすると
python
1Traceback (most recent call last): 2 File "<console>", line 1, in <module> 3 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/manager.py", line 82, in manager_method 4 return getattr(self.get_queryset(), name)(*args, **kwargs) 5 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/query.py", line 839, in filter 6 return self._filter_or_exclude(False, *args, **kwargs) 7 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/query.py", line 857, in _filter_or_exclude 8 clone.query.add_q(Q(*args, **kwargs)) 9 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1253, in add_q 10 clause, _ = self._add_q(q_object, self.used_aliases) 11 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1277, in _add_q 12 split_subq=split_subq, 13 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1215, in build_filter 14 condition = self.build_lookup(lookups, col, value) 15 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/sql/query.py", line 1085, in build_lookup 16 lookup = lookup_class(lhs, rhs) 17 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/lookups.py", line 18, in __init__ 18 self.rhs = self.get_prep_lookup() 19 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/fields/related_lookups.py", line 115, in get_prep_lookup 20 self.rhs = target_field.get_prep_value(self.rhs) 21 File "/home/mashihiko/.pyenv/versions/3.7.1/lib/python3.7/site-packages/django/db/models/fields/__init__.py", line 947, in get_prep_value 22 return int(value) 23ValueError: invalid literal for int() with base 10: '制作物'
となります
python
1Post.objects.filter(category_id="制作物")
としても同じエラーが出ました。
正しく取得する方法をご教授願います。
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