Question

I have a Rails application that is trying to update multiple users at a time in User table.
I tried giving multiple ids separated with ‘,’ ,but fails and getting error like “no route matches”, i have created a custom method “assign” , with route specified as ,

"assign/:id" => "users#assign" , :via => [:put] 

I am trying to update through POSTMAN REST Client.

My PUT Request,

http://localhost:3000/assign/6,7,8    ---   PUT

data:

{
   "users":[
    {
       "trainerid":4
    },
    {
       "trainerid":5
    },
    {
       "trainerid":6
    }
    ]
}

Mu Controller

def assign
    @ids = params[:id].split(",")
    @users = params[:users]
    @ids.each_with_index do |i|
      @user = User.find(i)
      @user.updateattributes(@users[index])
    end
    render :json => { :status => :ok, :message => "User Updated Successfully"}.to_json 
end

Here i am trying to update trainerid in users table with id: 4 ,5 ,6

Is it possible to update in another way.

Any help is appreciated…..

Answer 1

Why put the IDs in the URL? Splitting the string feels wrong. Why not just have a simpler route, just to users/assign? Then in your JSON you can have:

{ "users":[
  { "id":6, "trainer_id":4 },
  { "id":7, "trainer_id":5 },
  { "id":8, "trainer_id":6 }
]}

And deal with it thus:

def assign
  params[:users].each do |hash|
    User.find(hash['id']).update_attributes hash
  end
end

Obviously it needs error handling etc, but that’s the basic method. Note that update_attributes will only update those attributes flagged as attr_accessible, so you don’t have to worry about the IDs’ presence in the hashes.