Having issue with Cakephp Database Migrations - php

Question

I am trying to create a table using database migrations, here is my code
public function change()
{
$table = $this->table('tags');
$table->addColumn('title', 'string', ['default' => null,'limit' => 255,'null' => false,]);
$table->addColumn('created', 'datetime', ['default' => null,'null' => false,]);
$table->addColumn('modified', 'datetime', ['default' => null,'null' => false,]);
$table->addUniqueKey('title'); // Giving error **Fatal error: Call to undefined method Phinx\Db\Table::addUniqueKey()**
$table->create();
}
I want to set title column unique, but when I try to do it then it gives the error:
Fatal error: Call to undefined method Phinx\Db\Table::addUniqueKey()

Answer 1

Add primary key refer http://book.cakephp.org/3.0/en/orm/schema-system.html
public function change() {
$t = new Table('posts');
$t->addColumn('id', 'integer')
->addColumn('author_id', 'integer')
->addColumn('title', 'string')
->addColumn('slug', 'string');
// Add a primary key.
$t->addConstraint('primary', [
'type' => 'primary',
'columns' => ['id']
]);
// Add a unique key
$t->addConstraint('slug_idx', [
'columns' => ['slug'],
'type' => 'unique',
]);
// Add index
$t->addIndex('slug_title', [
'columns' => ['slug', 'title'],
'type' => 'index'
]);
// Add a foreign key
$t->addConstraint('author_id_idx', [
'columns' => ['author_id'],
'type' => 'foreign',
'references' => ['authors', 'id'],
'update' => 'cascade',
'delete' => 'cascade'
]);
}

Answer 2

This should be the solution
$table->addColumn('title', 'string',
[
'default' => null,
'limit' => 255,
'null' => false,
]);
$table->addIndex(['title'], ['unique' => true]); // < this is what you looking for
I am surprised CakePHP documentation doesn't mention it properly. After long searching, I found the solution in this article