Undefined Method

rubyonrails-talk
1

Hi all,

I am currently trying to get a bunch of links to to display all the related console records upon button click so e.g. If a user clicks on the Dreamcast link then I would like it to display all records that have Dreamcast stored as their console.

I have the following example code in my index class:

<%= link_to 'DREAMCAST', games_path(:console => 'Dreamcast')%>

the above code is repeating for each individual console.

Now in my gamescontroller I have the following in my index:

  def index     @games = Game.paginate(:per_page => 4, :page => params[:page]).search(params[:search])     @games = @games.find_by_console(params[:console]) unless params[:console].blank?   end

The problem I receive is that when I click on the Gaming section of my website I receive the following error message which I assume is to say activerecord is not connecting:

undefined method `find_by_console' for #<WillPaginate::Collection:0x52cb9d8>

How would I go about solving this problem I have come across?

2

At first, .find_by_<attr_name> is a ActiveRecord::Relation's method. That is why it doesn't responded. At second, this method is a "lazy" method, oriented to return _just_one_ instance, corresponding to condition. Is that your app-logic? I don't think so..

So, your way is:

games_relation = case params[:console].present? when true then Game.where(:console => params[:console]) else Game end @games = games_relation.paginate(:per_page => 4, :page => params[:page]).search(params[:search])

3

Valery Kvon wrote in post #1048505:

website I receive the following error message which I assume is to say activerecord is not connecting:

undefined method `find_by_console' for #<WillPaginate::Collection:0x52cb9d8>

At first, .find_by_<attr_name> is a ActiveRecord::Relation's method. That is why it doesn't responded. At second, this method is a "lazy" method, oriented to return _just_one_ instance, corresponding to condition. Is that your app-logic? I don't think so..

So, your way is:

games_relation = case params[:console].present? when true then Game.where(:console => params[:console]) else Game end @games = games_relation.paginate(:per_page => 4, :page => params[:page]).search(params[:search])

Ok thanks for your feedback, so of what I have understood in my gamescontroller.rb I will have the following:

def index @games = games_relation.paginate(:per_page => 4, :page => params[:page]).search(params[:search]) end

in my game.rb file I will have the following:

games_relation = case params[:console].present?   when true then Game.where(:console => params[:console])   else Game end

and in my index.html.erb I will have the following:

<%= link_to 'DREAMCAST', games_path(:console => 'Dreamcast')%>

please correct me if I am wrong. Thanks for your help.

4

No no no, that was all for index action:

def index

games_relation = case params[:console].present?

when true then Game.where(:console => params[:console])

else Game

end

@games = games_relation.paginate(:per_page => 4, :page => params[:page]).search(params[:search])

end

5

def index   games_relation = case params[:console].present?   when true then Game.where(:console => params[:console])   else Game   end   @games = games_relation.paginate(:per_page => 4, :page => params[:page]).search(params[:search]) end

Thank you very much, that has solved my problem :slight_smile:

Thanks for all your help you have saved me many of hours pondering.