hack having the children table provisioned from the backend

app/models/type/attribute_groups.rb

@@ -110,7 +110,7 @@ module Type::AttributeGroups
       ordered << [groupkey, members.sort] if members.present?
     end
 
-    ordered << [:children, [Query.new_default]]
+    ordered << [:children, [default_children_query]]
 
     ordered
   end
@@ -200,4 +200,13 @@ module Type::AttributeGroups
       .reject { |key| custom_field?(key) && !has_custom_field?(key) }
       .group_by { |key| default_group_key(key.to_sym) }
   end
+
+  def default_children_query
+    query = Query.new_default
+    query.column_names = %w(id type subject)
+    query.show_hierarchies = false
+    query.filters = []
+    query.add_filter('parent', '=', '1')
+    query
+  end
 end

frontend/app/components/wp-form-group/wp-query-group.component.ts

@@ -69,7 +69,6 @@ export class WorkPackageFormQueryGroupComponent implements OnInit, OnDestroy {
   ];
 
   constructor(protected wpRelationsHierarchyService:WorkPackageRelationsHierarchyService,
-              protected wpCacheService:WorkPackageCacheService,
               protected PathHelper:PathHelperService,
               @Inject(UrlParamsHelperServiceToken) protected queryUrlParamsHelper:UrlParamsHelperService,
               @Inject(I18nToken) protected I18n:op.I18n) {
@@ -79,7 +78,7 @@ export class WorkPackageFormQueryGroupComponent implements OnInit, OnDestroy {
     this.canHaveChildren = !this.workPackage.isMilestone;
     this.canModifyHierarchy = !!this.workPackage.changeParent;
 
-    this.childrenQueryProps = this.queryUrlParamsHelper.buildV3GetQueryFromQueryResource(this.group.query,
+    this.childrenQueryProps = this.queryUrlParamsHelper.buildV3GetQueryFromQueryResource(this.contextualizedQuery,
                                                                                         {})
   }
 
@@ -90,4 +89,16 @@ export class WorkPackageFormQueryGroupComponent implements OnInit, OnDestroy {
   public refreshTable() {
     this.childrenEmbeddedTable.refresh();
   }
+
+  private get contextualizedQuery() {
+    let duppedQuery = _.clone(this.group.query)
+
+    _.each(duppedQuery.filters, (filter) => {
+      if (filter._links.filter.href.endsWith('parent')) {
+        filter._links.values[0].href = this.PathHelper.workPackagePath(this.workPackage.id);
+      }
+    });
+
+    return duppedQuery;
+  }
 }

frontend/app/components/wp-form-group/wp-query-group.template.html

@@ -1,16 +1,16 @@
-  <wp-embedded-table #childrenEmbeddedTable
-                     [compactTableStyle]="true"
-                     [queryProps]="childrenQueryProps"
-                     [tableActions]="childrenTableActions"
-                     [configuration]="{ actionsColumnEnabled: true,
-                                          hierarchyToggleEnabled: false,
-                                          inlineCreateEnabled: false,
-                                          columnMenuEnabled: false,
-                                          contextMenuEnabled: false,
-                                          projectContext: false }" >
-  </wp-embedded-table>
+<wp-embedded-table #childrenEmbeddedTable
+                   [compactTableStyle]="true"
+                   [queryProps]="childrenQueryProps"
+                   [tableActions]="childrenTableActions"
+                   [configuration]="{ actionsColumnEnabled: true,
+                                      hierarchyToggleEnabled: false,
+                                      inlineCreateEnabled: false,
+                                      columnMenuEnabled: false,
+                                      contextMenuEnabled: false,
+                                      projectContext: false }" >
+</wp-embedded-table>
 
-  <wp-relation-add-child
-      [workPackage]="workPackage"
-      (onAdded)="refreshTable()"
-      *ngIf="canModifyHierarchy && canHaveChildren"></wp-relation-add-child>
+<wp-relation-add-child
+    [workPackage]="workPackage"
+    (onAdded)="refreshTable()"
+    *ngIf="canModifyHierarchy && canHaveChildren"></wp-relation-add-child>

frontend/app/components/wp-query/url-params-helper.ts

@@ -265,9 +265,12 @@ export class UrlParamsHelperService {
   }
 
   private buildV3GetValuesFromFilter(filter:any) {
-    let values = filter.values ? filter.values : filter._links.values;
+    if (filter.values) {
+      return _.map(filter.values, (v) => this.queryFilterValueToParam(v));
+    } else {
+      return _.map(filter._links.values, (v:any) => this.idFromHref(v.href));
+    }
 
-    return _.map(values, (v) => this.queryFilterValueToParam(v));
   }
 
   private buildV3GetSortByFromQuery(query:QueryResource) {
@@ -288,7 +291,9 @@ export class UrlParamsHelperService {
   }
 
   private idFromHref(href:string) {
-    return href.substring(href.lastIndexOf('/') + 1, href.length);
+    let id = href.substring(href.lastIndexOf('/') + 1, href.length);
+
+    return decodeURIComponent(id);
   }
 }
 

lib/api/v3/work_packages/schema/form_configurations/query_representer.rb

@@ -46,6 +46,10 @@ module API
                                 end,
                                 getter: ->(*) do
                                   next unless embed_links
+
+                                  # For some reason, the context (query) of the filters
+                                  # are lost. We therefore set it anew:
+                                  query.set_context
                                   ::API::V3::Queries::QueryRepresenter.new(query, current_user: current_user)
                                 end