Post

models.py

class Post(Document) :
    title=StringField(max_length=200,blank=False)      
    content = StringField(blank=False)
    categories = ReferenceField(Category,default=Category.objects.first())
    tags= ListField(ReferenceField(Tags))

forms.py

from .models import Category,Tags,Post
class PostForm(DocumentForm)   :
    class Meta:
        model=  Post
        fields='__all__'   

views.py

from .models import Post
from .forms import PostForm