Migrations\Shell\Task\MigrationDiffTask::getConstraints PHP Метод

    protected function getConstraints()
    {
        foreach ($this->commonTables as $table => $currentSchema) {
            $currentConstraints = $currentSchema->constraints();
            $oldConstraints = $this->dumpSchema[$table]->constraints();
            // brand new constraints
            $addedConstraints = array_diff($currentConstraints, $oldConstraints);
            foreach ($addedConstraints as $constraintName) {
                $this->templateData[$table]['constraints']['add'][$constraintName] = $currentSchema->constraint($constraintName);
            }
            // constraints having the same name between new and old schema
            // if present in both, check if they are the same : if not, remove the old one and add the new one
            foreach ($currentConstraints as $constraintName) {
                $constraint = $currentSchema->constraint($constraintName);
                if (in_array($constraintName, $oldConstraints) && $constraint !== $this->dumpSchema[$table]->constraint($constraintName)) {
                    $this->templateData[$table]['constraints']['remove'][$constraintName] = $this->dumpSchema[$table]->constraint($constraintName);
                    $this->templateData[$table]['constraints']['add'][$constraintName] = $constraint;
                }
            }
            // removed constraints
            $removedConstraints = array_diff($oldConstraints, $currentConstraints);
            foreach ($removedConstraints as $constraintName) {
                $constraint = $this->dumpSchema[$table]->constraint($constraintName);
                if ($constraint['type'] === Table::CONSTRAINT_FOREIGN) {
                    $this->templateData[$table]['constraints']['remove'][$constraintName] = $constraint;
                } else {
                    $this->templateData[$table]['indexes']['remove'][$constraintName] = $constraint;
                }
            }
        }
    }