models.py

from __future__ import unicode_literals

from django.db import models
from rest_framework import routers, serializers, viewsets
from warpauth.models import LdapUser

class ProductCategory(models.Model):
    name = models.CharField(max_length=100, unique=True)
    def __str__(self):
        return self.name

class ProductCategorySerializer(serializers.ModelSerializer):
    class Meta:
        model = ProductCategory
        fields = ['id', 'name']

class Product(models.Model):
    name = models.CharField(max_length=100, null=True)
    price_ek = models.FloatField()
    price_vk = models.FloatField()
    category = models.ForeignKey(ProductCategory, on_delete=models.CASCADE, null=True)
    stock_count = models.IntegerField()
    barcode = models.CharField(max_length=100, null=True)

    def __str__(self):
        return self.name


class ProductSerializer(serializers.ModelSerializer):
    category = serializers.StringRelatedField()
    class Meta:
        model = Product
        fields = ['id', 'name', 'price_vk', 'category', 'barcode','stock_count']


class Transaction(models.Model):
    date = models.DateTimeField(auto_now_add=True)
    product = models.ForeignKey(Product, on_delete=models.CASCADE, null=True)
    type = models.IntegerField()  # 1: aufladen; 2:kaufen
    amount = models.FloatField()
    cash_paid = models.BooleanField(default=False)

    def __str__(self):
        return str(self.amount) #self.product.name+" - "+self.amount


class TransactionLog(models.Model):
    uid = models.CharField(max_length=100)
    transaction = models.ForeignKey(Transaction, on_delete=models.CASCADE, null=True)


class UserCredit(models.Model):
    uid = models.CharField(max_length=100,unique=True)
    card_id = models.CharField(max_length=10, null=True) # Unique only with django 1.11
    credit = models.FloatField()

    def __str__(self):
        return self.uid


class UserCreditSerializer(serializers.ModelSerializer):
    class Meta:
        model = UserCredit
        fields = ['uid', 'card_id', 'credit']