link_to text - using ruby code for html text - ruby-on-rails

Question

I want the Link text on my view to display as Hospital, Country. Country is a guidelines attribute so I need to be able to access guidelines.country from 'hospital' and display it
e.g. Get Well Hospital, Sickland
I'm not sure how to code this correctly. At the moment in my view file I have
<% #list.each do |hospital| %>
<tr class="tablerow">
<td><%= link_to (hospital, country), :action => :topichospital, :hospital => hospital, :country=>country %></td>
</tr>
It worked when I just had, but I'm not sure how to add the country too
<% #list.each do |hospital| %>
<tr class="tablerow">
<td><%= link_to hospital, :action => :topichospital, :hospital => hospital %></td>
</tr>
my listhospital action in guidelines_controller.rb is
def listhospital
#list = Guideline.order(:hospital).uniq.pluck(:hospital)
respond_to do |format|
format.html # index.html.erb
format.json { render json: #guidelines }
end
end

Answer 1

change your link_to to
<%= link_to "#{hospital}, #{country}", { :action => :topichospital, :hospital => hospital, :country=>country } %>
This will convert the first parameter passed to string. I'm not sure how rails interprets (hospital, country) in a link_to when passed as the first parameter but this will make sure to call the to_s methods for each.
UPDATE: IIRC, you can use pluck to combine attributes
# postgre
#list = Guideline.order(:hospital).uniq.pluck("hospital || ', ' || country")
# mysql
#list = Guideline.order(:hospital).uniq.pluck("CONCAT(hospital, ', ', country)")
then you can just use link_to hospital in the view.
UPDATE: This is becoming a bit of a hack. I suggest you change the controller to
#list = Guideline.select('hospital, country').order(:hospital).uniq
Then in your view
<% #list.each do |guideline| %>
<tr class="tablerow">
<td><%= link_to "#{guideline.hospital}, #{guideline.country}", { :action => :topichospital, :hospital => guideline.hospital, :country => guideline.country }%></td>
</tr>
<% end %>

Answer 2

I think you're looking for:
<%= link_to "#{hospital}, #{country}", :action => :topichospital, :hospital => hospital, :country=>country %>
You could also pass a block to link_to:
<%= link_to :action => :topichospital, :hospital => hospital, :country=>country do %>
<%= hospital %>, <%= country %>
<% end %>
http://api.rubyonrails.org/classes/ActionView/Helpers/UrlHelper.html#method-i-link_to