如何在 laravel 迁移中将字符串转换为布尔值？

Question

我想将字段从字符串转换为布尔值 试试这段代码：

 public function up()
{
    Schema::table('users', function (Blueprint $table) {
        $table->boolean('email_permission')->change();
        $table->boolean('sms_permission')->change();
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::table('users', function (Blueprint $table) {
        //
    });
}

但我得到了下面的错误

Doctrine\DBAL\Driver\PDOException::("SQLSTATE[42804]: Datatype mismatch: 7 ERROR:  column 
"email_permission" cannot be cast automatically to type boolean
HINT:  You might need to specify "USING email_permission::boolean".")

这是原始迁移：

   public function up()
{
    Schema::table('users', function (Blueprint $table) {
        $table->string('email_permission')->nullable()->default('0');
        $table->string('sms_permission')->nullable()->default('0');
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::table('users', function (Blueprint $table) {
        $table->dropColumn('email_permission');
        $table->dropColumn('sms_permission');
    });
}

如何将此字段类型从整数更改为布尔值？

Answer 1

我用这种方式，效果很好

 public function up()
{
    Schema::table('users', function (Blueprint $table) {
        DB::statement("ALTER TABLE users 
          ALTER COLUMN email_permission DROP DEFAULT,
          ALTER COLUMN email_permission TYPE BOOLEAN USING email_permission::BOOLEAN,
          ALTER COLUMN email_permission SET DEFAULT FALSE;");
    });
}