schemas.py

from marshmallow import Schema, fields

class PlainItemSchema(Schema):
    item_id = fields.Str(dump_only=True)
    name= fields.Str(required=True)
    price=fields.Float(required=True)

class ItemUpdateSchema(Schema):
    name= fields.Str()
    price=fields.Float()
    store_id=fields.Int()

class PlainStoreSchema(Schema):
    store_id=fields.Str(dump_only=True)
    name=fields.Str(required=True)
    
class PlainTagSchema(Schema):
    tag_id=fields.Int(dump_only=True)
    name=fields.Str(required=True)

class StoreSchema(PlainStoreSchema):
    items=fields.List(fields.Nested(PlainItemSchema()), dump_only=True)
    tags=fields.List(fields.Nested(PlainTagSchema()),dump_only=True)

class ItemSchema(PlainItemSchema):
    store_id=fields.Int(required=True,load_only=True)
    store=fields.Nested(PlainStoreSchema(),dump_only=True)
    tags=fields.List(fields.Nested(PlainTagSchema()),dump_only=True)

class TagSchema(PlainTagSchema):
    store_id=fields.Int(required=True,load_only=True)
    store=fields.Nested(PlainStoreSchema(),dump_only=True)
    items=fields.List(fields.Nested(PlainItemSchema()),dump_only=True)

class ItemTagSchema(Schema):
    message=fields.Str()
    item=fields.Nested(ItemSchema)
    tag=fields.Nested(TagSchema)

class UserSchema(Schema):
    id=fields.Int(dump_only=True)
    username=fields.Str(required=True)
    password=fields.Str(required=True,load_only=True)