Update EntityName to optional parameter

Author: miqueldespuig

utility/getDataflowEntity.pq

@@ -1,31 +1,22 @@
 let
-    Function =
-        (WorkspaceId as text, DataflowId as text, EntityName as text) as table =>
-            let 
-                //DEBUGGING VARIABLES
-                //WorkspaceId = WorkspaceId_DataDictionary,
-                //DataflowId = DataflowId_DataDictionary,
-                //EntityName = "column_rename",
-
-                SrcData = PowerBI.Dataflows(),
-                WorkspaceData = SrcData{[workspaceId = WorkspaceId]}[Data],
-                DataflowData = WorkspaceData{[dataflowId = DataflowId]}[Data],
-                DataflowEntity = DataflowData{[entity = EntityName]}[Data]
-            in
-                DataflowEntity,
-    FunctionType =
-        type function (WorkspaceId as text, DataflowId as text, EntityName as text) as table
+    getDataflowEntity = 
+    (WorkspaceId as text, DataflowId as text, optional EntityName as text) =>
+        let
+            Source = PowerBI.Dataflows(null),
+            Workspace = Source{[workspaceId=WorkspaceId]}[Data],
+            Dataflow = Workspace{[dataflowId=DataflowId]}[Data],
+            Entity = if EntityName = null then Dataflow else Dataflow{[entity=EntityName]}[Data]
+        in
+            Entity,
+    Documentation = type function (WorkspaceId as text, DataflowId as text, optional EntityName as text) as table
         meta
         [
             Documentation.Author = "Miquel Despuig",
-            Documentation.Version = "0.0.0", // MajorVersion|MinorVersion|Revision
+            Documentation.Version = "0.1.0", // MajorVersion|MinorVersion|Revision
+            Documentation.Date = "2022-05-03",
             Documentation.Name = "getDataflowEntity",
-            Documentation.LongDescription = "Returns a table with the data in the <code>EntityName</code> from the Workspace <code>WorkspaceId</code> and Dataflow <code>DataflowId</code>"
+            Documentation.Description = "Given a <code>WorkspaceId</code> and a <code>DataflowId</code> and an optional <code>EntityName</code> returns either a table with a list of entities in the specified dataflow or a table with the data in the <code>EntityName</code>"
         ],
-    Ascribed =
-        Value.ReplaceType(
-            Function,
-            FunctionType
-        )
+  Ascribed = Value.ReplaceType(getDataflowEntity, Documentation)
 in
-    Ascribed
+  Ascribed