Laravel Solution: Double quote in MySQL (Laravel Seeder)

I have a trouble with Laravel DB Seeder. I've tried to put value to json row:

'rating' => '{"avg":2,"clean":2,"place":1,"keeper":1}'

And I got this in MySQL:

"{\"avg\":2,\"clean\":2,\"place\":1,\"keeper\":1}"

But there is no problem with creating json array:

[{"number":"+7 999 9999999","name":"Some name"},{"number":"8 111 1234567","name":"Body"}]

Sorry for my English. Please, help!

Laravel Solution