Laravel 5.4迁移中时间戳和nullableTimestamp之间的区别

Question

According to Laravel documentation :

• $table->timestamps(); Adds nullable created_at and updated_at columns.
• $table->nullableTimestamps(); Nullable versions of the timestamps() columns.

I don't understand. In other words, what I read is:

• A creates nullable columns
• B is like A but it creates nullable columns

What did I miss?

Answer 1

Since Laravel 5.2 there is no difference. If you look at the source you'll see that nullableTimestamps() is an alias for timestamps()

/**
 * Add nullable creation and update timestamps to the table.
 *
 * @return void
 */
public function timestamps()
{
    $this->timestamp('created_at')->nullable();
    $this->timestamp('updated_at')->nullable();
}

/**
 * Add nullable creation and update timestamps to the table.
 *
 * Alias for self::timestamps().
 *
 * @return void
 */
public function nullableTimestamps()
{
    $this->timestamps();
}