How to include a new attribute to my json array in ruby?

Question

I have User object and each user have {a Tag (tag_id attribute) I want to return User.all info in json and also add all Tag attributes toguether.

So I have

users = User.where(some condition)
response = { token: current_user.token, users: users }
render json: response

and I get

"token":"token_value",
"users":[{ each user info here and also "tag_id":1}...]

I want to get

"token":"token_value",
"users":[
    { each user info here and tag info inside each user "tag":{ tag info here }}...
]

How can I do it?

I already try all answers from this almost duplicade question

Only one "worked", I try:

users = User.where(some condition).to_json(include: [:tag])
response = { token: current_user.token, users: users }
render json: response

But now my json is look's wrong:

{"token":"9ce32ecb324dccdd7a3e691bd8eab404",
"users":"[
{\"id\":377,\"nome\":\"CAIXA-ALM-CPARK-PE-ELE-0203-PAV00-nomeDoarquivo.dwg\",\"endereco\":\"https://localhost-gus.s3.us-west-2.amazonaws.com/users/9/f8770023-00e9-401c-884b-a97d16cae10c/CAIXA-ALM-CPARK-PE-ELE-0203-PAV00-nomeDoarquivo.dwg\",\"s3_key\":\"users/9/f8770023-00e9-401c-884b-a97d16cae10c/CAIXA-ALM-CPARK-PE-ELE-0203-PAV00-nomeDoarquivo.dwg\",\"deletado\":\"NÃO\",\"tamanho\":3205827,\"user_id\":9,\"created_at\":\"2018-05-12T11:19:55.961-03:00\",\"updated_at\":\"2018-05-12T11:19:55.961-03:00\",\"tag_id\":7,\"upload_date\":\"2018-05-12T11:19:55.960-03:00\",\
"tag\":{\"id\":7,\"nome\":\"ELÉTRICA\",\"cor\":\"#4A148C\",\"created_at\":\"2018-04-05T09:06:35.227-03:00\",\"updated_at\":\"2018-04-05T09:06:35.227-03:00\",\"abreviacao\":\"ELE\"}}
]"}

I got \ for each attribute and I don't know why

But if I use without token at my response, works fine:

users = User.where(some condition).to_json(include: [:tag])
response = { users: users }
render json: response

I already edited this question because it was marked as duplicate but as I explaim above it's not duplicate. So I am following the instructions from this meta.stackexchange link so someone with the right privileges can fix this.

Someone closed this as an exact duplicate of another question but it’s not an exact duplicate question. So here is your answer: use as_json on the first line, not to_json. as_json returns a Hash which can be embedded in the JSON hash. to_json returns a string which will then be escaped when included in the outer bash. — Brian Morearty
– Brian Morearty, Commented May 13, 2018 at 3:25

vipin · Accepted Answer · 2018-05-14 06:26:22Z

3

use as_json

as_json returns a hash representation of your model object, while to_json returns a JSON object.

> { :name => "Test", 'age' => 25 }.to_json
"{\"name\":\"Test\",\"age\":25,}"

> { :name => "Test", 'age' => 25, }.as_json
{"name"=>"Test", "age"=>25,}

answered May 14, 2018 at 6:26

vipin

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