Question

我正在研究IBM Worklight。我需要访问两个集合中的数据。是否有任何解决方案加入2个集合并获得必填字段？

Answer 1

JSONSTORE无法合并集合。

然而，以下博文详细介绍了实现此目的的一种方法：https://mobilefirstplatform.ibmcloud.com/blog/2015/02/24/working-jsonstore-collections-join/

创建一个集合：

var OrdersCollection = {
      orders: {
        searchFields: {
          order_id: 'integer',
          order_date: 'string'
        },
        additionalSearchFields: {
          customer_id: 'integer'
        }
      }
};
var CustomerCollection = {
      customers: {
          searchFields: {
              customer_name : 'string',
              contact_name : 'string',
              country : 'string'
          },
          additionalSearchFields : {
              customer_id : 'integer'
          }
        }
    };

使用其他搜索字段添加数据：

var data = [
                        {order_id : 462, order_date : '1-1-2000'},
                        {order_id: 608, order_date : '2-2-2001'},
                        {order_id: 898, order_date : '3-3-2002'}
                        ];
            var counter = 0;
            var q = async.queue(function (task, callback) {
                setTimeout(function () {
                    WL.JSONStore.get('orders').add(task.data, {additionalSearchFields: {customer_id: task.customer_id}});
                    callback(++counter);
                },0);
            },1);
            for(var i = 0; i < data.length; i++){
             q.push({data : data[i], customer_id: i+1}, function(counter){
                 console.log("Added Order Doc " + counter);
             });
            }
        q.drain = function(){
            setTimeout(function() {
                console.log("Finished adding order documents");
                WL.JSONStore.get("orders").findAll({filter : ["customer_id", "order_id", "order_date"]})
                    .then(function (res) {
                        ordersCollectionData = res;
                        document.getElementById("orders").innerHTML = JSON.stringify(res, null, "\t");
                    })
                     .fail(function (err) {
                            console.log("There was a problem at " + JSON.stringify(err));
                    });
            },0);
        };

找到要合并的文件：

WL.JSONStore.get('orders').findAll({filter : ['customer_id', 'order_id', 'order_date']})
                    .then(function (res) {
                        ordersCollectionData = res;
                    });

合并

var shared_index = 'customer_id';
var mergedCollection = [];
mergedCollection =_.merge(customerCollectionData, ordersCollectionData, function(a, b){
        if(_.isObject(a) && (a[shared_index] == b[shared_index])) {
            return _.merge({}, a, b);
        }
});

如何在json商店中加入两个集合？

1 个答案: