gistfile1.txt

############ Models ############

class Fund < ActiveRecord::Base
  attr_accessible :name
  
  has_many :portfolios
end


class Investment < ActiveRecord::Base
  attr_accessible :portfolio_id, :stock_id
  
  belongs_to :portfolio
  belongs_to :stock
end


class Portfolio < ActiveRecord::Base
  attr_accessible :fund_id, :period
  
  belongs_to :fund
  has_many :investments
  has_many :stocks, :through => :investments
end


class Stock < ActiveRecord::Base
  attr_accessible :issuer
  
  has_many :investments
  has_many :portfolios, :through => :investments
end

############ controllers/funds_controller.rb ############

  def show
    @fund = Fund.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render :json => @fund }
    end
  end

############ views/funds/show.html.erb ############

<%= form_for(@fund) do |f| %>
  <%= f.collection_select :period, @fund.portfolios(:all), :id, :period %>
  <%= f.submit %>
<% end %>

############ Error I receive ############

NoMethodError in Funds#show

Showing /Users/tory/dev/gator/app/views/funds/show.html.erb where line #17 raised:

undefined method `period' for #<Fund:0x103d9d128>