と の 2 つのモデルがUser
ありConf
ます。彼らにはhas_and_belongs_to_many
関係があります。新しい conf オブジェクトを作成するときに、それを複数の既存のユーザーに割り当てたいのですが、次のエラーが発生しました。
NoMethodError in Confs#create
undefined method `each' for nil:NilClass
これらは私のモデルです:
class User < ActiveRecord::Base
attr_accessible :email, :name, :password, :password_confirmation, :developer, :admin, :company_id, :boss_id
belongs_to :company
has_and_belongs_to_many :confs
validates :company_id, presence: true
validates :boss_id, presence: true
validates :name, presence: true, length: { maximum:50 }
end
class Conf < ActiveRecord::Base
attr_accessible :id, :linear_axis_number, :control_unit_brand, :control_unit_model, :description,
:machine_brand, :machine_model, :milling_mode, :rotary_axis_number, :tool_axis_x, :tool_axis_y,
:tool_axis_z, :turning_mode, :machine_name, :developer_id, :xml, :users
validates_presence_of :users
has_and_belongs_to_many :users
belongs_to :developer, :class_name => 'User', :foreign_key => 'developer_id'
has_attached_file :xml, :url => "downloads/:attachment/:id/:basename.:extension", :path => ":rails_root/downloads/:attachment/:id/:basename.:extension"
attr_protected :xml_file_name, :xml_content_type, :xml_file_size
end
これは confs_controller.rb です:
class ConfsController < ApplicationController
before_filter :signed_in_user, only:[:index, :edit, :update, :destroy]
before_filter :developer_user, only: :destroy
def new
@users = User.where(:boss_id => current_user.id)
@conf = Conf.new
end
def create
@conf = Conf.new(conf_params)
if @conf.save
flash[:success] = "New Configuration uploaded!"
redirect_to conf_show_own_path
else
flash[:error] = "There is a problem!"
render 'new'
end
end
private
def conf_params
params.require(:conf).permit( :id, :linear_axis_number, :control_unit_brand, :control_unit_model, :xml,
:description, :machine_brand, :machine_model, :milling_mode, :developer_id,
:rotary_axis_number, :tool_axis_x, :tool_axis_y, :tool_axis_z, :turning_mode,
:machine_name, :users) if params[:conf]
end
end
そしてここに new.html.erb があります:
<%= form_for @conf, :html => {:multipart => true} do |f| %>
<%= f.label :machine_name %>
<%= f.text_field :machine_name %>
....
<% @users.each do |g| %>
<%= check_box_tag 'conf[user_ids][]', g.id, false, :id => g.name %>
<%= label_tag g.name %>
<% end %>
<%= f.submit "Upload", class: "btn btn-large btn-primary" %>
<% end %>