Example usage for org.springframework.data.mongodb.core.aggregation Order getId

Introduction

In this page you can find the example usage for org.springframework.data.mongodb.core.aggregation Order getId.

Prototype

public String getId() 

Source Link

Usage

From source file:example.springdata.mongodb.aggregation.OrderRepositoryImpl.java

/**
 * The implementation uses the MongoDB aggregation framework support Spring Data provides as well as SpEL expressions
 * to define arithmetical expressions. Note how we work with property names only and don't have to mitigate the nested
 * {@code $_id} fields MongoDB usually requires.
 * //from  w w w  . j  a va 2 s.co  m
 * @see example.springdata.mongodb.aggregation.OrderRepositoryCustom#getInvoiceFor(example.springdata.mongodb.aggregation.Order)
 */
@Override
public Invoice getInvoiceFor(Order order) {

    AggregationResults<Invoice> results = operations.aggregate(newAggregation(Order.class, //
            match(where("id").is(order.getId())), //
            unwind("items"), //
            project("id", "customerId", "items") //
                    .andExpression("'$items.price' * '$items.quantity'").as("lineTotal"), //
            group("id") //
                    .sum("lineTotal").as("netAmount") //
                    .addToSet("items").as("items"), //
            project("id", "items", "netAmount") //
                    .and("orderId").previousOperation() //
                    .andExpression("netAmount * [0]", taxRate).as("taxAmount") //
                    .andExpression("netAmount * (1 + [0])", taxRate).as("totalAmount") //
    ), Invoice.class);

    return results.getUniqueMappedResult();
}

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