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Rails building multiple relationships in one form
undefined method `id' for #<Array:0x26abe70>
app/models/project.rb:35:in `pfollow!'
app/controllers/prelationships_controller.rb:6:in `create'
Request

Parameters:

{"utf8"=>"âœ“",
  "authenticity_token"=>"NKqa1f0M2yPLQDHbRLnxl3SiwBeTus/1q1hpZjD7hgY=",
  "prelationship"=>{"pfollower_id"=>["4",
  "5"]},
  "project_id"=>"90",
  "commit"=>"Pfollow"}

class PrelationshipsController < ApplicationController

  def create
    @project = Project.find(params[:project_id])
    @plant = Plant.find(params[:prelationship][:pfollower_id])
      @project.pfollow!(@plant)
   respond_to do |format|
     format.html { redirect_to @project }
     format.js
   end
  end
end

def pfollow!(pfollowed)
    prelationships.create!(:pfollowed_id => pfollowed.id)
  end

params[:prelationship][:pfollower_id].each do |p|
 @project.pfollow!( Plant.find(p) )
end