add option to upload file when creating a table

app/Http/Controllers/TableController.php

@@ -81,16 +81,17 @@ class TableController extends Controller
      */
     public function create()
     {
-        $exampleData =
-            "Mercenaria mercenaria,hard clam,40\n" .
-            "Magallana gigas,pacific oyster,30\n" .
-            "Patella vulgata,common limpet,20";
+        $exampleData = "";
+//            "Mercenaria mercenaria,hard clam,40\n" .
+//            "Magallana gigas,pacific oyster,30\n" .
+//            "Patella vulgata,common limpet,20";
 
         $columns = Column::columnsFromJson([
             // fake 'id' to satisfy the check in Column constructor
-            ['id' => 1, 'name' => 'latin',    'type' => 'string', 'title' => 'Latin Name'],
-            ['id' => 2, 'name' => 'common',   'type' => 'string', 'title' => 'Common Name'],
-            ['id' => 3, 'name' => 'lifespan', 'type' => 'int',    'title' => 'Lifespan (years)']
+            ['id' => 1, 'name' => 'column_1', 'type' => 'string', 'title' => 'First Column'],
+//            ['id' => 1, 'name' => 'latin',    'type' => 'string', 'title' => 'Latin Name'],
+//            ['id' => 2, 'name' => 'common',   'type' => 'string', 'title' => 'Common Name'],
+//            ['id' => 3, 'name' => 'lifespan', 'type' => 'int',    'title' => 'Lifespan (years)']
         ]);
 
         return view('table.create', [
@@ -210,7 +211,33 @@ class TableController extends Controller
         }
 
         // --- DATA ---
-        $dataCsvLines = Utils::csvToArray($input->data);
+        $fname = 'csv-file';
+        $dataCsvLines = [];
+        if ($request->hasFile($fname)) {
+            try {
+                $file = $request->file($fname);
+                if ($file->isValid() && $file->isReadable()) {
+                    $handle = $file->openFile();
+                    $dataCsvLines = Utils::csvToArray($handle);
+                    if (empty($dataCsvLines)) throw new \Exception("Failed to parse CSV file.");
+                    $handle = null;
+                } else {
+                    throw new \Exception("File not valid.");
+                }
+            } catch (\Exception $e) {
+                return $this->backWithErrors(['csv-file' => $e->getMessage()]);
+            }
+        }
+        else if ($input->data) {
+            try {
+                $text = trim($input->data);
+                if (!empty($text)) {
+                    $dataCsvLines = Utils::csvToArray($text);
+                }
+            } catch (\Exception $e) {
+                return $this->backWithErrors(['data' => $e->getMessage()]);
+            }
+        }
 
         // Preparing data to insert into the Rows table
         $rowsToInsert = null;

app/Models/Row.php

@@ -83,6 +83,7 @@ class Row extends BaseModel
      */
     public static function allocateRowIDs($count)
     {
+        if ($count == 0) return null;
         $last = \DB::selectOne("SELECT multi_nextval('global_row_id_seq', ?) AS last_id;", [$count])->last_id;
         return [$last - $count + 1, $last];
     }