old_contents: from models.base_model import BaseModel
  from datetime import datetime
  from models.user_model import UserModel
  from peewee import CharField, TextField, DateTimeField, IntegerField, ForeignKeyField
  
  WAIFU_SHARING_STATUS_PRIVATE = 1
  WAIFU_SHARING_STATUS_PUBLIC_MODERATION = 2
  WAIFU_SHARING_STATUS_PUBLIC = 3
  
  
  class WaifuModel(BaseModel):
      class Meta:
          db_table = 'waifus'
  
      name = CharField(max_length=128, null=False)
      description = TextField(null=False)
      pic = CharField(max_length=128, null=False)
      created_at = DateTimeField(null=False, default=datetime.now)
      updated_at = DateTimeField(null=False, default=datetime.now)
      rating = IntegerField(null=False, default=0)
      sharing_status = IntegerField(null=False, default=WAIFU_SHARING_STATUS_PRIVATE)
      owner = ForeignKeyField(UserModel, related_name='waifus_created_by_me')
  
new_contents: from models.base_model import BaseModel
  from datetime import datetime
  from models.user_model import UserModel
  from peewee import CharField, TextField, DateTimeField, IntegerField, ForeignKeyField
  
  WAIFU_SHARING_STATUS_PRIVATE = 1
  WAIFU_SHARING_STATUS_PUBLIC_MODERATION = 2
  WAIFU_SHARING_STATUS_PUBLIC = 3
  
  
  class WaifuModel(BaseModel):
      class Meta:
          db_table = 'waifus'
  
      name = CharField(max_length=128, null=False)
      description = TextField(null=False)
      pic = CharField(max_length=128, null=False)
      created_at = DateTimeField(null=False, default=datetime.now)
      updated_at = DateTimeField(null=False, default=datetime.now)
      rating = IntegerField(null=False, default=0)
      sharing_status = IntegerField(null=False, default=WAIFU_SHARING_STATUS_PRIVATE)
      owner = ForeignKeyField(UserModel, related_name='waifus_created_by_me')
  
      def to_json(self):
          json = super(WaifuModel, self).to_json()
          json['users_count'] = self.users.count()
          return json
  
subject: Add users count to json representation.