Why am I getting an argument outside of the exception

Question

I'm starting rails on Rails 4. I'm trying to create a list of wines that takes the name of the winery and the year of the bottle. Here is my form

<%= form_for @wine do |f| %> <%# render "errors", object: @wine %> <div class="form-group input-group input-group-lg"> <%= f.text_field :name, placeholder: "Enter the winery name", class: "form-control input-lg" %> </div> <div class="form-group input-group input-group-lg"> <%= select_year(Date.today, start_year: Time.now.year, end_year: Time.now.year - 90, field_name: :year, prefix: :wine) %> </div> <div class="form_group input-group"> <%= f.submit "Add wine", class: "btn btn-success" %> </div> <% end %> 

Here is my controller

 class WinesController < ApplicationController before_action :set_wine, only: [:show, :edit, :update, :destroy] def index @wines = Wine.all end def new @wine = Wine.new end def create @wine = Wine.new(wine_params) if @wine.save flash[:notice] = "Successfully created..." redirect_to @wine else flash.now[:error] = "There was a problem" render "new" end end def show end def edit end def update if @wine.update(wine_params) redirect_to @wine else flash[:error] = "Something went wrong" render "edit" end end def destroy @wine.destroy redirect_to wines_path end private def set_wine @wine = Wine.find(params[:id]) end def wine_params params.require(:wine).permit(:name, :year) end end 

I have a table of my wines with the name: string column and year: datetime column

Whenever I try to create a new wine, I get an argument out of range exception and @wine = Wine.new(wine_params) in my create action. What am I doing wrong?

My magazine

 Started GET "/wines/new" for 127.0.0.1 at 2013-09-04 10:55:54 -0700 Processing by WinesController#new as HTML Rendered wines/_form.html.erb (2.0ms) Rendered wines/new.html.erb within layouts/application (2.6ms) Rendered layouts/_header.html.erb (0.2ms) Rendered layouts/_footer.html.erb (0.1ms) Completed 200 OK in 10ms (Views: 9.3ms | ActiveRecord: 0.0ms) Started GET "/assets/comingsoonbg.png" for 127.0.0.1 at 2013-09-04 10:55:54 -0700 Started GET "/wines/new" for 127.0.0.1 at 2013-09-04 10:55:54 -0700 Processing by WinesController#new as HTML Rendered wines/_form.html.erb (2.1ms) Rendered wines/new.html.erb within layouts/application (2.7ms) Rendered layouts/_header.html.erb (0.2ms) Rendered layouts/_footer.html.erb (0.1ms) Completed 200 OK in 10ms (Views: 9.8ms | ActiveRecord: 0.0ms) Started POST "/wines" for 127.0.0.1 at 2013-09-04 10:55:59 -0700 Processing by WinesController#create as HTML Parameters: {"utf8"=>"✓", "authenticity_token"=>"FCd3wvCov+mugnJuzwplKD/eVskJKgxweh1mK0pG2wM=", "wine"=>{"name"=>"kjkljhk", "year"=>"2013"}, "commit"=>"Add wine"} Completed 500 Internal Server Error in 1ms ArgumentError (argument out of range): app/controllers/wines_controller.rb:13:in `create' Rendered /Users/me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_source.erb (0.7ms) Rendered /Users/me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_trace.erb (0.9ms) Rendered /Users/me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (0.9ms) Rendered /Users/me/.rvm/gems/ruby-2.0.0-p247/gems/actionpack-4.0.0/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (16.2ms) 

My scheme for wines in schema.rb

 create_table "wines", force: true do |t| t.datetime "year" t.datetime "created_at" t.datetime "updated_at" t.string "name" end 

Answer 1

Date and time always require me to think twice! The params log contains a line with the year from select_year . The simplest solution was to just keep the integer representation if you needed years. If you later change to select_date , you will need to create a Date object in your controller, extracting parts from the params hash. For more information, see the Guide to Using Forms for more details ... well, just a little.

In view:

 <%= select_date Date.today, prefix: :start_date %> 

In the controller to create a Date object:

 Date.civil(params[:start_date][:year].to_i, params[:start_date][:month].to_i, params[:start_date][:day].to_i) 

ActiveRecord expects the attribute to have one entry in the params hash, but Date objects require multiple values. date_select (not select_date ) date date_select will return a hash that Rails converts with multi- select_date assignment to Date during mass assignment.

 <%= date_select :person, :birth_date %> 

If you used date_select , you see something like this in the params hash:

 {:person => {'birth_date(1i)' => '2008', 'birth_date(2i)' => '11', 'birth_date(3i)' => '22'}} 

Note that the keys in the :person hash describe the order and type of the multipart object, so Rails can figure out how to create the attribute (for example, the birth_date(2i) hash key is the second component of birth_date in the Person model object and is an integer).