[Django]Better Validation on Update Views

CodingEntrepreneurs Django 강의 정리

forms>

from django import forms

from .models import BlogPost


class BlogPostForm(forms.Form):
    title = forms.CharField()
    slug = forms.SlugField()
    content = forms.CharField(widget=forms.Textarea)


class BlogPostModelForm(forms.ModelForm):
    # title = forms.CharField()

    class Meta:
        model = BlogPost
        fields = ["title", "slug", "content"]

    def clean_title(self, *args, **kwargs):
        # print(dir(self))
        instance = self.instance
        print(instance)
        title = self.cleaned_data.get("title")
        qs = BlogPost.objects.filter(title=title)

        if instance is not None:
            qs = qs.exclude(pk=instance.pk)  # id=instance.id

        if qs.exists():
            raise forms.ValidationError(
                "This title has already been used. Please try again."
            )

        return title