fix(Pivot): Filtering strategy does not work for complex objects in Pivot

Author: mddragnev

projects/igniteui-angular/src/lib/data-operations/filtering-strategy.ts

@@ -2,6 +2,8 @@ import { FilteringLogic, IFilteringExpression } from './filtering-expression.int
 import { FilteringExpressionsTree, IFilteringExpressionsTree } from './filtering-expressions-tree';
 import { resolveNestedPath, parseDate } from '../core/utils';
 import { GridType } from '../grids/common/grid.interface';
+import { IgxPivotGridComponent } from '../grids/pivot-grid/pivot-grid.component';
+import { PivotUtil } from '../grids/pivot-grid/pivot-util';
 
 const DateType = 'date';
 const DateTimeType = 'dateTime';
@@ -139,3 +141,23 @@ export class FormattedValuesFilteringStrategy extends FilteringStrategy {
         return value;
     }
 }
+
+export class PivotFilteringStrategy extends FilteringStrategy {
+
+    constructor() {
+        super();
+    }
+
+    protected getFieldValue(rec: any, fieldName: string, isDate: boolean = false, isTime: boolean = false, grid?: GridType): any {
+        let value = resolveNestedPath(rec, fieldName);
+        if (value && !(value instanceof Object)) {
+            value = value && (isDate || isTime) ? parseDate(value) : value;
+            return value;
+        }
+        const config = (grid as IgxPivotGridComponent).pivotConfiguration;
+        const allDimensions = config.rows.concat(config.columns).concat(config.filters).filter(x => x !== null && x !== undefined);
+        const flattenedDims = PivotUtil.flatten(allDimensions, 0);
+        const dimension = flattenedDims.find(x => x.memberName === fieldName);
+        return dimension.memberFunction ? dimension.memberFunction(rec) : value;
+    }
+}

projects/igniteui-angular/src/lib/grids/pivot-grid/pivot-filtering.service.ts

@@ -2,6 +2,7 @@ import { Injectable } from '@angular/core';
 import { IFilteringOperation } from '../../data-operations/filtering-condition';
 import { FilteringLogic } from '../../data-operations/filtering-expression.interface';
 import { FilteringExpressionsTree, IFilteringExpressionsTree } from '../../data-operations/filtering-expressions-tree';
+import { PivotFilteringStrategy } from '../../data-operations/filtering-strategy';
 import { IgxFilteringService } from '../filtering/grid-filtering.service';
 import { IgxPivotGridComponent } from './pivot-grid.component';
 import { PivotUtil } from './pivot-util';
@@ -42,6 +43,7 @@ export class IgxPivotFilteringService extends IgxFilteringService {
         this.prepare_filtering_expression(filteringTree, fieldName, term, conditionOrExpressionsTree, ignoreCase, fieldFilterIndex);
         dim.filter = filteringTree;
         grid.filteringPipeTrigger++;
+        grid.filterStrategy = new PivotFilteringStrategy();
         if (allDimensions.indexOf(dim) !== -1) {
             // update columns
             (grid as any).setupColumns();