I’m fairy new to Laravel. I have created a migration file named: create_notes_table and when running command php artisan migrate this error message pops up.
my create_notes_table file content
class CreateNotesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('notes', function (Blueprint $table) {
            $table->increments('id');
            $table->number('card_id');
            $table->body('string');
            $table->timestamps();
        });
    }
    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('notes');
    }
}
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Answer
As the error message states there is no body() method in migrations.
https://laravel.com/docs/8.x/migrations#columns
Change your function up() to :
public function up()
    {
        Schema::create('notes', function (Blueprint $table) {
            $table->increments('id');
            $table->integer('card_id');
            $table->string('body');
            $table->timestamps();
        });
    }
While we’re at it, number() also doesn’t exist, changed it to integer()
Edit: changed number to integer