i'm trying to pass json data to rails controller using post method in rest client

Question

Here i'm trying to save json data to sqlite database using rails controller, but i'm not getting json data to controller parameters

In a specific controller I have the below list of params:

Parameters: {"person"=>"{\"name\":\"akhil\",\"profession\":\"it\",\"address\":\"hyderabad\",\"mobilenum\":67588}"}

Controller

def createPerson

  puts "parameters are : "+params[:person].to_s
  user_params = ActiveSupport::JSON.decode(params[:person])
  puts "parameters name:"+user_params[:name].to_s
  @person = Person.new(name: user_params[:name], profession: 
  user_params[:profession], address: user_params[:address], mobilenum: 
  user_params[:mobilenum]) 
  @person.save

end  

It is showing below error

(no implicit conversion of nil into String)

I'm getting the nil value in user_params[:name].to_s

Could you please help me to solve this

Answer 1

Seems like all you need to do is to create a new Person record after submitting a form. Well, probably you would want to use strong params and make a little refactor, so your controller will look something like this:

class PersonsController < ApplicationController
  # you can name your action simply `create`, so you can use resource routing
  def create
    # most probably you don't need to make person an instance variable
    person = Person.new(person_params)
    # and here it is a good practice to check if you really saved your person
    if person.save
      # do something to tell user that the record is saved, e.g.
      flash[:success] = 'person has been saved'
    else
      # show user why your person record is not saved, e.g.
      flash[:error] = "person cannot be saved: #{person.errors.full_messages.to_sentence}"
    end
  end

  private

    # and here is the method for your permissible parameters
    def person_params
      params.require(:person).permit(:name, :profession, :address, :mobilenum)
    end
end