How to alter params method to accept a JSON array in rails controller?

Question

I have a basic API built by rails new my_api --api, then rails g scaffold model name age.

I would like to alter the model_params method to accept a JSON array. How can I do this?

The current method is the default:

   def model_params
      params.require(:model).permit(:name, :age)
   end

What I've tried

I have tried this:

    def model_params
      params.require(:model).permit?([:name, :age])
    end

But I get

Completed 400 Bad Request in 10ms (ActiveRecord: 10.3ms)


  
ActionController::ParameterMissing (param is missing or the value is empty: model):
  
app/controllers/models_controller.rb:83:in `model_params'
app/controllers/models_controller.rb:29:in `create'

Note

The curl request I make is

curl -H "Accept: application/json" -H "Content-type: application/json" -d '[{"name": "Fred", "age": "5"}, {"name": "Fred", "age": "5"}, {"name": "Fred", "age": "5"}]' "http://localhost:3000/models"

kishore cheruku · Accepted Answer · 2019-07-10 09:32:42Z

0

possibility which I think I like even better would be to allow permit! to take an optional parameter, to allow this.

params.require(:model).permit(:name).permit!(:data)

You can refer this This

answered Jul 10, 2019 at 9:32

kishore cheruku

5212 silver badges11 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

kcsujeet · Accepted Answer · 2019-07-10 10:34:34Z

0

your strong param requires an object called model which has keys name and age so you need to make your request body in that format.

        { "model" : { 
                "name": "Ross", 
                "age": "25"
          }

but what you want is

    [{"name": "Fred", "age": "5"}, 
{"name": "Fred", "age": "5"},
 {"name": "Fred", "age": "5"}]

so this should work.

  {"model": {
    "name_and_age": [
    {"name": "Fred", "age": "5"}, 
    {"name": "Fred", "age": "5"},
     {"name": "Fred", "age": "5"}
    ]
    }

}

for this to work you'll have to change remove :name, :age from permit and add name_and_age instead somethings like.

def model_params
      params.require(:model).permit(:name_and_age)
    end

edited Jul 10, 2019 at 10:34

answered Jul 10, 2019 at 9:31

kcsujeet

5512 silver badges12 bronze badges

5 Comments

stevec Over a year ago

Really appreciate your response. can you please reword to use the model name (model) and attribute names (name, age) used in the question?

kcsujeet Over a year ago

can you please update the question with what you're sending from front-end at the moment.. your request body.

stevec Over a year ago

I have updated the question to show the curl request

stevec Over a year ago

I tried it. I get ActionDispatch::Http::Parameters::ParseError (765: unexpected token at 'model: {name_and_age: .. etc, so I tried as suggested here, now I get Completed 400 Bad Request in 1ms (ActiveRecord: 0.2ms) and

ActionController::ParameterMissing (param is missing or the value is empty: model): app/controllers/models_controller.rb:83:in

model_params'` and app/controllers/models_controller.rb:29:in create'`

kcsujeet Over a year ago

check edited answer again. and i suggest using postman instead of curl. also if you decide to go the way i'm suggesting then you'll have to process the request data in a format you want. maybe there are better ways to do it. not sure.

Collectives™ on Stack Overflow

How to alter params method to accept a JSON array in rails controller?

What I've tried

Note

2 Answers 2

Comments

5 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

What I've tried

Note

2 Answers 2

Comments

5 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related