Service - Cart

Overview

Manages a shopping cart of sell offers prior to confirming as order/s.

Repository

https://bitbucket.org/izara-market-orders/izara-market-orders-cart

DynamoDB tables

Standard Config Table Per Service

Configuration tags

{
	configTag: "SellOfferManagerServiceName"
	configKey: "SellOfferManagerServiceName"
	configValue: xxx // eg: "SellOfferManager"
}

{
	configTag: "DeliveryMethodManagerServiceName"
	configKey: "DeliveryMethodManagerServiceName"
	configValue: xxx // eg: "DeliveryMethodManager"
}

{
	configTag: "PaymentMethodManagerServiceName"
	configKey: "PaymentMethodManagerServiceName"
	configValue: xxx // eg: "PaymentMethodManager"
}

{
	configTag: "SellOfferPlanServiceName"
	configKey: "SellOfferPlanServiceName"
	configValue: xxx // eg: "SellOfferPlan"
}

{
	configTag: "OrderGraphServiceName"
	configKey: "OrderGraphServiceName"
	configValue: xxx // eg: "OrderGraph"
}

Graph database

Service - Orders Graph

Nodes

{
	nodeLabel: "{CartPlanLib.CART_GRAPH_NODE_LABEL}", // "cart"
	schema: {
		identifier: true,
		restrictProperties: true,
		restrictRelationships: true,
		properties: {
			cartId: {
				identifier: true, // create unique id from request params and uniqueMessageId
			},
			totalQuantity: {},
			totalValue: {}, // will be in the currency of the deliveryMethod selected (which will validate as all sellOffers must offer that deliveryMethod)
			name: {},
			status: {}, // validating|valid|invalid|partiallyValid
			dateValidated: {}, // date last time validated
		},
	}
}

{
	nodeLabel: "{CartPlanLib.CART_SELLOFFERLINK_GRAPH_NODE_LABEL}", // "cartSellOfferLink"
	schema: {
		identifier: true,
		restrictProperties: true,
		restrictRelationships: true,
		properties: {
			cartSellOfferLinkId: {
				identifier: true, // create unique id from request params and uniqueMessageId
			},
			quantity: {},
			valid: {}, // true|false depending on last validation check
		},
	}
}

{
	nodeLabel: "{CartPlanLib.CARTORDER_GRAPH_NODE_LABEL}", // "cartOrder"
	schema: {
		identifier: true,
		restrictProperties: true,
		restrictRelationships: true,
		properties: {
			cartOrderId: {
				identifier: true, // create unique id from request params and uniqueMessageId
			},
			totalQuantity: {},
			totalValue: {}, // will be in the currency of the paymentMethod selected (when changes need to re-calculate)
		},
	}
}

Relationships

{
	relationshipType: "{CartPlanLib.createHasActiveCartGraphRelationshipType()}", // "hasActive_cart"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

{
	relationshipType: "{CartPlanLib.createHasCompletedCartGraphRelationshipType()}", // "hasCompleted_cart"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

{
	relationshipType: "{CartPlanLib.createHasDeletedCartGraphRelationshipType()}", // "hasDeleted_cart"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

• links a user to a cart
• a cart can either be active, completed, or deleted

{
	relationshipType: "{CartPlanLib.cartPaymentMethodGraphRelationshipType()}", // "cart_paymentMethod"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

• links a cart to it's current paymentMethod setting

{
	relationshipType: "{CartPlanLib.cartDeliveryMethodGraphRelationshipType()}", // "cart_deliveryMethod"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

• links a cart to it's current deliveryMethod setting

{
	relationshipType: "{CartPlanLib.createHasCartSellOfferLinkGraphRelationshipType()}", // "has_cartSellOfferLink"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

{
	relationshipType: "{CartPlanLib.createCartSellOfferLinkIsSellOfferGraphRelationshipType()}", // "cartSellOfferLinkIs_sellOffer"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

• Links cartSellOfferLink to one sellOffer

{
	relationshipType: "{CartPlanLib.createCarthasCartOrderGraphRelationshipType()}", // "has_cartOrder"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

{
	relationshipType: "{CartPlanLib.createCartOrderHasCartSellOfferLinkGraphRelationshipType()}", // "cartOrderHas_cartSellOfferLink"
	schema: {
		elementCanBeRemoved: true,
		allPropertiesImmutable: true,
		restrictProperties: true,
		properties: {
			originTimestamp: //timestamp the request to create/change this relationship was sent
		},
	}
}

Cart Orders

• One care can have many sellOffers from many sellers/sellOfferPlans etc that cannot be purchased as a single order
• When validating split out into multiple orders according to what can be combined into a single payment/order

Grouping into orders

• Done when validating cart
• Go through each selloffer:
  1. does it offer the cart's paymentMethod? If not is invalid
  2. does its offer the cart's deliveryMethod? If not is invalid
  3. does the quantity chosen validate sellOffer available qty/minimum quantity? If not is invalid
  4. if no sellOffers valid then cart status is invalid. If some sellOffers invalid then cart status is partiallyValid
  5. if sellOffer does not combine then it gets put into it's own order
  6. split sellOffers by seller and stock location

Data model notes

• Not storing history of cart details, consider this data transient and of low importance, no need to have record of changes

Ideas

• cart service could have function for testing multiple prices, find all payment methods and delivery methods offered by all sell offers in cart, then find total price for each combination (maybe also check all delivery methods ship to selected destination?)

Working documents

Cart