Cake\Database\Schema\SqliteSchema::convertForeignKeyDescription PHP Method

    public function convertForeignKeyDescription(Table $table, $row)
    {
        $name = $row['from'] . '_fk';
        $update = isset($row['on_update']) ? $row['on_update'] : '';
        $delete = isset($row['on_delete']) ? $row['on_delete'] : '';
        $data = ['type' => Table::CONSTRAINT_FOREIGN, 'columns' => [$row['from']], 'references' => [$row['table'], $row['to']], 'update' => $this->_convertOnClause($update), 'delete' => $this->_convertOnClause($delete)];
        if (isset($this->_constraintsIdMap[$table->name()][$row['id']])) {
            $name = $this->_constraintsIdMap[$table->name()][$row['id']];
        } else {
            $this->_constraintsIdMap[$table->name()][$row['id']] = $name;
        }
        $table->addConstraint($name, $data);
    }