Add the ability to fully customize jet generated files.

generator/metadata/table_meta_data.go

@@ -0,0 +1,22 @@
+package metadata
+
+// Table metadata struct
+type Table struct {
+	Name    string
+	Columns []Column
+}
+
+// MutableColumns returns list of mutable columns for table
+func (t Table) MutableColumns() []Column {
+	var ret []Column
+
+	for _, column := range t.Columns {
+		if column.IsPrimaryKey {
+			continue
+		}
+
+		ret = append(ret, column)
+	}
+
+	return ret
+}