Make inventory app

• configuratie aanmaken
• viewsets aanmaken
• serializers aanmaken
• urls aanpassen
• Product aanmaken
  • id
  • slug
  • name
  • type
    • rentable
    • purchaseable
  • default_rental_period
  • price
• Purchase aanmaken
  • id
  • slug
  • product; ForeignKey to Product
  • profile; ForeignKey to Profile
  • debt_entry; ForeignKey to DebtEntry
  • sunmember; ForeignKey to SUNMember
  • purchase_date
  • amount; minvaluevalidator >0
  • price; minvaluevalidator >0
  • total_price; minvaluevalidator >0; computedField: amount x price
• Rental aanmaken
  • id
  • slug
  • product; ForeignKey to Product
  • profile; ForeignKey to Profile
  • sunmember; ForeignKey to SUNMember
  • date_rented
  • rented_until
  • price; minvaluevalidator >0
• Profile aanpassen
  • purchases; ManyToMany to product through Purchase
  • rentals; ManyToMany to product through Rental