Strong parameters require multiple

Question

I\'m receiving a JSON package like:

{
  \"point_code\" : { \"guid\" : \"f6a0805a-3404-403c-8af3-bfddf9d334f2\" }
}

I would like to tell Rai

Answer 1

OK, ain't pretty but should do the trick. Assume you have params :foo, :bar and :baf you'd like to require all for a Thing. You could say

def thing_params
  [:foo, :bar, :baf].each_with_object(params) do |key, obj|
    obj.require(key)
  end
end

each_with_object returns obj, which is initialized to be params. Using the same params obj you require each of those keys in turn, and return finally the object. Not pretty, but works for me.

Answer 2

This question came up in my google search for a different case ie, when using a "multiple: true" as in:

<%= form.file_field :asset, multiple: true %>

Which is a totally different case than the question. However, in the interest of helping out here is a working example in Rails 5+ of that:

form_params = params.require(:my_profile).permit({:my_photos => []})

Answer 3

As of 2015 (RoR 5.0+) you can pass in an array of keys to the require method in rails:

params.require([:point_code, :guid])

http://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-require

Answer 4

The solution proposed in Rails documentation (https://api.rubyonrails.org/classes/ActionController/Parameters.html#method-i-require) is:

def point_code
  params.require(:point_code).permit(:guid).tap do |point_code_params|
    point_code_params.require(:guid) # SAFER
  end
end

Answer 5

Although a lot of these answers show you how to get what you're asking for, I would like to add to these answers and suggest that you use a before_action. If the required params are missing, require will automatically return a 400 error

class SomeController < ApplicationController
  before_action :ensure_valid_params, only: :index

  def index
    # do your stuff
  end

private

  def ensure_valid_params
    params.require(:some_required_param)
  end
end

Answer 6

require takes one parameter. So there is no way you can pass in multiple keys unless you override the require method. You can achieve what you want with some additional logic in your action:

def action
  raise ActionController::ParameterMissing.new("param not found: point_code") if point_params[:point_code].blank?
  raise ActionController::ParameterMissing.new("param not found: guid") if point_params[:point_code][:guid].blank?

  <do your stuff>
end

def point_params
  params.permit(point_code: :guid)
end