Data Subscriptions: Common Data Subscription Creation Examples

Here we create a plain subscription on the Orders collection, without any constraint or transformation.

store.subscriptions.create(Order);

store.subscriptions.create({ query: "from Orders" });

Here we create a subscription on Orders collection, which total order revenue is greater than 100.

const query = `declare function getOrderLinesSum(doc) {
        var sum = 0;
        for (var i in doc.Lines) { sum += doc.Lines[i]; }
        return sum;
    }
    from Orders as o 
    where getOrderLinesSum(o) > 100`;

const name = await store.subscriptions.create({ query });

Here we create a subscription on Orders collection, which total order revenue is greater than 100, and return only ID and total revenue.

const query = 
    `declare function getOrderLinesSum(doc) {
        var sum = 0; 
        for (var i in doc.Lines) { sum += doc.Lines[i]; }
        return sum;
    }

    declare function projectOrder(doc) {
         return {
             Id: order.Id,
             Total: getOrderLinesSum(order)
         }
     }
     from order as o 
     where getOrderLinesSum(o) > 100 
     select projectOrder(o)`;

const name = await store.subscriptions.create({ query });

Here we create a subscription on Orders collection, which total order revenue is greater than 100, and return ID, total revenue, shipping address and responsible employee name.

const query =
    `declare function getOrderLinesSum(doc) {
        var sum = 0;
        for (var i in doc.Lines) { sum += doc.Lines[i]; }
        return sum;
    }

    declare function projectOrder(doc) {
         var employee = LoadDocument(doc.Employee);
         return {
             Id: order.Id,
             Total: getOrderLinesSum(order),
             ShipTo: order.ShipTo,
             EmployeeName: employee.FirstName + ' ' + employee.LastName
         }
     }
     from order as o
     where getOrderLinesSum(o) > 100
     select projectOrder(o)`;

const name = await store.subscriptions.create({ query });

Here we create a subscription on Orders collection, which returns current and previous version of the subscriptions. Please see the page dedicated to subscriptions with revisions for more details and examples.

const name = await store.subscriptions.createForRevisions(Order);

const name = await store.subscriptions.createForRevisions({
    query: "from orders (Revisions = true)"
});