Question

I’m using play framework 1.2.4 and i’m preparing an meal order system. So i want to get them in a map.

package models;

import java.util.ArrayList;
import java.util.Date;
import java.util.Map;

import javax.persistence.Entity;
import javax.persistence.ManyToMany;

import play.db.jpa.Model;

@Entity
public class Order extends Model{


Map<Item, Float> orders;

Table table;
Date date;  

public Order(Map<Item, Float> orders, Table table) {
    super();
    this.orders = orders;
    this.table = table;
    date = new Date();
}

}

But when i start the application it gives this error,

JPA error
A JPA error occurred (Unable to build EntityManagerFactory): Could not determine type for: java.util.Map, at table: Order, for columns: [org.hibernate.mapping.Column(orders)]

How can i store orders like 1 porsion pizza, 1.5 porsion soup etc.

Answer 1

You must change table name for the entity Order by using @Table annotation. In many DBMS “order” is a reserved word.

@Entity
@Table(name="apporder")
public class Order extends Model {
    // ...
}

About order items: you need other entity for storing this data. For example:

OrderItem.java

package models;

import java.util.*;
import javax.persistence.*;

import play.db.jpa.*;
import play.data.validation.*;

@Entity
public class OrderItem extends Model {

    @ManyToOne
    public Order order;

    @ManyToOne
    public Item item;

    public Float qty;

}