implement GRIDs

app/Http/Controllers/TableController.php

@@ -189,12 +189,19 @@ class TableController extends Controller
         // Preparing data to insert into the Rows table
         $rowsData = null;
         try {
-            $rowsData = array_map(function ($row) use ($columns) {
-                if (count($row) == 0 || count($row)==1&&$row[0]=='') return null;
+            $grid_range = Row::allocateGRIDs(count($rowTable));
+            $grid_cnt = $grid_range[0];
+
+            $rowsData = array_map(function ($row) use ($columns, &$grid_cnt) {
+                if (count($row) == 0 || count($row) == 1 && $row[0] == '') return null;
                 if (count($row) != count($columns)) {
                     throw new NotApplicableException("All rows must have " . count($columns) . " fields.");
                 }
-                $parsed = [];
+
+                $parsed = [
+                    '_grid' => $grid_cnt++
+                ];
+
                 foreach ($row as $i => $val) {
                     $key = $columns[$i]->name;
                     if (strlen($val) > 255) {