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<?php
declare(strict_types=1);
namespace Engelsystem\Migrations;
use Engelsystem\Database\Migration\Migration;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Database\Schema\Blueprint;
use stdClass;
/**
* This migration creates the "questions" table and migrates the existing "Questions" records.
*/
class CreateQuestionsTable extends Migration
{
use ChangesReferences;
use Reference;
/**
* @return void
*/
public function up(): void
{
$hasPreviousQuestionsTable = $this->schema->hasTable('Questions');
if ($hasPreviousQuestionsTable) {
// Rename because some SQL DBMS handle identifiers case insensitive
$this->schema->rename('Questions', 'PreviousQuestions');
}
$this->createNewQuestionsTable();
if ($hasPreviousQuestionsTable) {
$this->copyPreviousToNewQuestionsTable();
$this->changeReferences(
'PreviousQuestions',
'QID',
'questions',
'id',
'unsignedInteger'
);
$this->schema->drop('PreviousQuestions');
}
}
/**
* @return void
*/
public function down(): void
{
// Rename as some SQL DBMS handle identifiers case insensitive
$this->schema->rename('questions', 'new_questions');
$this->createPreviousQuestionsTable();
$this->copyNewToPreviousQuestionsTable();
$this->changeReferences(
'new_questions',
'id',
'Questions',
'QID',
'unsignedInteger'
);
$this->schema->drop('new_questions');
}
/**
* @return void
*/
private function createNewQuestionsTable(): void
{
$this->schema->create('questions',
function (Blueprint $table) {
$table->increments('id');
$this->referencesUser($table, false);
$table->text('text');
$table->text('answer')
->nullable();
$this->references($table, 'users', 'answerer_id')
->nullable();
});
}
/**
* @return void
*/
private function copyPreviousToNewQuestionsTable(): void
{
$connection = $this->schema->getConnection();
/** @var stdClass[] $previousQuestionsRecords */
$previousQuestionsRecords = $connection
->table('PreviousQuestions')
->get();
foreach ($previousQuestionsRecords as $previousQuestionRecord) {
$connection->table('questions')->insert([
'id' => $previousQuestionRecord->QID,
'user_id' => $previousQuestionRecord->UID,
'text' => $previousQuestionRecord->Question,
'answerer_id' => $previousQuestionRecord->AID,
'answer' => $previousQuestionRecord->Answer,
]);
}
}
/**
* @return void
*/
private function createPreviousQuestionsTable(): void
{
$this->schema->create('Questions',
function (Blueprint $table) {
$table->increments('QID');
$this->references($table, 'users', 'UID');
$table->text('Question');
$this->references($table, 'users', 'AID')
->nullable();
$table->text('Answer')
->nullable();
});
}
/**
* @return void
*/
private function copyNewToPreviousQuestionsTable(): void
{
$connection = $this->schema->getConnection();
/** @var Collection|stdClass[] $questionRecords */
$questionRecords = $connection
->table('new_questions')
->get();
foreach ($questionRecords as $questionRecord) {
$connection->table('Questions')->insert([
'QID' => $questionRecord->id,
'UID' => $questionRecord->user_id,
'Question' => $questionRecord->text,
'AID' => $questionRecord->answerer_id,
'Answer' => $questionRecord->answer,
]);
}
}
}
|
