schema.py

from marshmallow import Schema, fields

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

class PlainStoreSchema(Schema):
    id = fields.Int(dump_only = True)
    name = fields.Str()


class PlainTagSchema(Schema):
    id = fields.Int(dump_only = True)
    name = fields.Str()

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

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

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

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


class TagItemSchema(Schema):
    message = fields.Str()
    items = fields.Nested(ItemSchema)
    tags = 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)