Question

My system has the following associations set up:

class Book < ActiveRecord::Base
has_many : suggestions
has_many : comments
has_many : references

On the Show view of my Book model, I want to give user an option to choose (from a drop box) the view they would like to see. So for example if a user selects suggestions from this drop box then the partial reloads with the suggestions. Similarly for the other 3 options.
In order to achieve this, I wrote the following method in my Model, book.rb:

def self.select_content_type(content_type)
case content_type

when "suggestions"
  # get the suggestions
  @book_suggestions = Book.suggestions.paginate(:per_page => 6, :page => params[:page])
  # return this
  return @book_suggestions

when "comments"
  # get the comments
  @book_comments = Book.comments.paginate(:per_page => 6, :page => params[:page])
  # return this
  return @book_comments

when "references"
  # get the references
  @book_references = Book.references.paginate(:per_page => 6, :page => params[:page])
  # return this
  return @book_references

end

end

I am trying to access this method in the “Show” action of my book_controller.rb as follows:

@book_content = Book.select_content_type(params[:content_type])

In the Show view, I have the following form to make a get request to this method:

   - form_tag  book_path(@book), :id=>"select_rel_form", :remote => true, :method => 'get' do               
      = text_field_tag :content_type, params[:content_type], :id=>"select_rel_type"
      = submit_tag "submit", :name => nil, :class=>"select_rel_submit"  

And in a partial named *_content* I am accessing the value returned as follows:

- if !@book_content.nil?
  - @issue_relations.each do |relation|
    ...

I get the following error:

NoMethodError (undefined method `suggestions' for #<Class:0x1177f4b8>):
app/models/book.rb:93:in `select_content_type'
app/controllers/books_controller.rb:21:in `show'

Kindly help me understand how I can fix this. If there’s a correct and better way to achieve this, please guide me. Thanks.

Answer 1

Your form tag has select_content_type and as it says it’s undefined, but there you should have something like book_path(@book)