Step 5. Create a custom web service

On the previous step, we implemented population of the group class timetable.

Now, implement a web service that provides information about the number of classes in the timetable. To call a web service, add the Web service button to the record page.

Create a custom web service  

1. Go to the Configuration section.
2. Select the "TryItPackage" package from the package list.

3. Click Add on the workspace toolbar and select the Source code configuration element type.

   
4. Fill out the property fields as follows:
   • Set Code to "UsrClassService".
   • Set Title to "Class service".
   

5. Add the source code in the Schema Designer.

   UsrClassService.cs

   namespace Terrasoft.Configuration.UsrClassService
   {
       using System;
       using System.ServiceModel;
       using System.ServiceModel.Web;
       using System.ServiceModel.Activation;
       using Terrasoft.Core;
       using Terrasoft.Core.DB;
       using Terrasoft.Common;
       using Terrasoft.Web.Common;
       using Terrasoft.Core.Entities; 
   
       [ServiceContract]
       [AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Required)]
       public class UsrClassService: BaseService
       {
   
           [OperationContract]
           [WebInvoke(Method = "POST", RequestFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Wrapped,
           ResponseFormat = WebMessageFormat.Json)]
           public int GetTrainingsQuantity(string code) {
               var classQuery = new Select(UserConnection)
                   .Column("Id")
                   .From("UsrClass")
                   .Where("UsrCode")
                       .IsEqual(Column.Parameter(code))
                   as Select;
               Guid id = classQuery.ExecuteScalar<Guid>();
               if (id==Guid.Empty) {
                   return -1;
               }
               var countQuery = new Select(UserConnection)
                   .Column(Func.Count("Id")).As("Count")
                   .From("UsrGroupTraining")
                   .Where("UsrClassId")
                       .IsEqual(Column.Parameter(id))
                   as Select;
               int result = countQuery.ExecuteScalar<int>();
               
               return result;
           }
       }
   }
   

6. Click Publish to save the schema.

Modify the page source code  

Add a class page button that calls the web service and displays the dialog box that contains the number of group classes in the timetable.

1. Go to the Configuration section.
2. Select the "TryItPackage" package from the package list.

3. The Wizards added schemas of various types to the package. Filter schemas by the Client module type.

   
4. Double-click the UsrClass1Page schema to open it.

5. Add a new localizable string for the button name to the schema.

   Click the button in the Localizable strings block of the properties panel and fill out the localizable string properties:

   • Set Code to "ServiceButtonCaption".
   • Set Value to "Web service".
   

6. Modify the source code.

   UsrClass1Page.js

   define("UsrClass1Page", ["ServiceHelper", "ProcessModuleUtilities"], function(ServiceHelper, ProcessModuleUtilities) {
       return {
           entitySchemaName: "UsrClass",
           /* No changes. */
           messages: {
               // ...
           },
           
           /* No changes. */
           attributes: {
               // ...
           },
           
           modules: /**SCHEMA_MODULES*/{}/**SCHEMA_MODULES*/,
           
           /* No changes. */
           details: /**SCHEMA_DETAILS*/{
                   // ...
           }/**SCHEMA_DETAILS*/,
           
           businessRules: /**SCHEMA_BUSINESS_RULES*/{}/**SCHEMA_BUSINESS_RULES*/,
           
           /* Add the new method to the existing methods. */
           methods: {
               
               // ...
               
               /* The method that handles the button clicks. */
               onGetServiceInfoClick: function() {
                   /* Retrieve the section code to pass as the incoming parameter of the service method. */
                   var code = this.get("UsrCode");
                   var serviceData = {
                       code: code
                   };
                   /* Call the service method. */
                   ServiceHelper.callService("UsrClassService", "GetTrainingsQuantity",
                       function(response) {
                           var result = response.GetTrainingsQuantityResult;
                           /* Display the service method output in the dialog box. */
                           this.showInformationDialog(result);
                       }, serviceData, this);
               }
           },
           dataModels: /**SCHEMA_DATA_MODELS*/{}/**SCHEMA_DATA_MODELS*/,
           
           /* Display the button on the record page. */
           diff: /**SCHEMA_DIFF*/[
           
               // ...
               /* Add the button element to the record page. */
               {
                   "operation": "insert",
                   /* The parent element name. */
                   "parentName": "ActionButtonsContainer",
                   "propertyName": "items",
                   /* The element name. */
                   "name": "GetServiceInfoButton",
                   "values": {
                       /* Set the element type to button. */
                       itemType: Terrasoft.ViewItemType.BUTTON,
                       /* Retrieve the element caption from the localizable string. */
                       caption: {bindTo: "Resources.Strings.ServiceButtonCaption"},
                       /* The method that handles the button clicks. */
                       click: {bindTo: "onGetServiceInfoClick"},
                       enabled: true,
                       /* The button position on the page. */
                       "layout": {"column": 1, "row": 6, "colSpan": 2, "rowSpan": 1}
                   }
               },
           
           ]/**SCHEMA_DIFF*/
       };
   });

7. Click Save to save the schema.

As a result, we implemented the web service that returns the number of group classes.