gistfile1.txt

Started POST "/admin/tasks" for 127.0.0.1 at 2012-04-30 11:58:53 +0200
Processing by Admin::TasksController#create as JS
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"6Rb8LRbmnOqdSUqQ+xJfyOHinwlLYThvfksXoTicIoQ=", "task"=>{"task_type"=>"Follow-up", "subject"=>"dsadsadsadsa", "responsible"=>"1", "client"=>"3", "deadline"=>"2012-04-30 11:58"}, "commit"=>"Save"}
  User Load (0.2ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 LIMIT 1
Completed 500 Internal Server Error in 2ms

ActiveRecord::AssociationTypeMismatch (Client(#70287180650000) expected, got String(#70287161020800)):
  app/controllers/admin/tasks_controller.rb:25:in `new'
  app/controllers/admin/tasks_controller.rb:25:in `create'

task.rb

class Task < ActiveRecord::Base
  attr_accessible :author, :deadline, :responsible, :subject, :task_type, :client
  
  belongs_to :client
  
  validates :task_type, :subject, :responsible, :deadline, :presence => true

end

task_helper.rb

module TaskHelper
  
  def task_clients
    client = Client.all
    client.map{|c| [c.name, c.id] }
  end
  
  def task_responsibles
    user = User.all
    user.map{ |u| [u.name, u.id] }
  end
  
  def task_types
    ['Follow-up', 'Meeting', 'Email', 'Contract', 'Conference call', 'Note']
  end
  
  
end

tasks_controller.rb

def create
    @task = Task.new(params[:task])
    @task.merge!(params[:author] => current_user)
    @client_tasks = @task.client_tasks.create(client.id)
    
    respond_to do |format|
      if @task.save
        flash[:success] = "<strong>Success!</strong> #{@task.subject} was successfully added.".html_safe
      end
      format.js { render :template => "admin/tasks/create.js.erb", 
        :locals => { 
          :task => @task, 
          :redirect_path => admin_tasks_path,
        }
      } # create.js.erb
    end
  end

def create
    client = Client.find(params[:task].delete(:client))
    @task = Task.new(params[:task].merge(:author => current_user, :client => client))

    respond_to do |format|

Or:

def create
    client_id = params[:task].delete(:client)
    @task = Task.new(params[:task].merge(:author => current_user, :client_id => client_id))

    respond_to do |format|