fixed the bug with view triggers in object explorer (#639)

src/Microsoft.SqlTools.ServiceLayer/ObjectExplorer/SmoModel/SmoQueryModel.cs

@@ -551,6 +551,16 @@ namespace Microsoft.SqlTools.ServiceLayer.ObjectExplorer.SmoModel
                     return new SmoCollectionWrapper<Trigger>(retValue).Where(c => PassesFinalFilters(parentTable, c));
                 }
             }
+            View parentView = context.Parent as View;
+            if (parentView != null)
+            {
+                var retValue = parentView.Triggers;
+                if (retValue != null)
+                {
+                    retValue.ClearAndInitialize(filter, extraProperties);
+                    return new SmoCollectionWrapper<Trigger>(retValue).Where(c => PassesFinalFilters(parentView, c));
+                }
+            }
             return Enumerable.Empty<SqlSmoObject>();
         }
     }

src/Microsoft.SqlTools.ServiceLayer/ObjectExplorer/SmoModel/SmoQueryModelDefinition.xml

@@ -57,7 +57,10 @@
     <NavigationPath Parent="Table" Field="Columns" SubField="DefaultConstraint" FieldType="Column" />
     <NavigationPath Parent="UserDefinedTableType" Field="Columns" SubField="DefaultConstraint" FieldType="Column" />
   </Node>
-  <Node Name="SqlDmlTrigger" Type="Trigger" Parent="Table" ValidFor="NotSqlDw" />
+  <Node Name="SqlDmlTrigger" Type="Trigger" ValidFor="NotSqlDw">
+    <Parent>Table</Parent>
+    <Parent>View</Parent>
+  </Node>
   <Node Name="SqlFullTextIndex" Parent="Table" Collection="False" ValidFor="NotSqlDw" />
   <Node Name="SqlStatistic" Parent="TableViewBase"/>
 

test/Microsoft.SqlTools.ServiceLayer.Test.Common/TestData/ObjectExplorer/Baselines/AllSqlObjects.txt

@@ -116,6 +116,7 @@ NodeType: Column Label: LastName (Name(nvarchar), not null) SubType: Status:
 NodeType: Column Label: Suffix (nvarchar(10), null) SubType: Status:
 NodeType: Column Label: JobTitle (nvarchar(50), not null) SubType: Status:
 NodeType: Column Label: AdditionalContactInfo (AdditionalContactInfoSchemaCollection, null) SubType: Status:
+NodeType: Trigger Label: ViewTrigger SubType: Status:
 NodeType: Synonym Label: dbo.MyProduct SubType: Status:
 NodeType: StoredProcedure Label: dbo.uspGetList SubType: Status:
 NodeType: StoredProcedureParameter Label: @Product (varchar, Input, No default) SubType:Input Status: