Rails 3: Join results in a view - sql

Question

Again I'm faced with something that should not on the face of it be this difficult but has been driving me mad for an hour or so. I have multiple models which I want to pull into one 'index' view. I assume it's a join but I can't seem to find a way to do it.
What I have in my index view:
<% #tips.each do |tip| %>
<tr>
<td><%= tip.user_id %></td>
<td><%= tip.city_id # here I want to draw on the cities table to show city.name
%></td>
<td><%= tip.type_id # here I want to draw on the type table to show type.name
%></td>
<td><%= tip.place_id # here I want to draw on the place table to show place.name
%></td>
<td><%= tip.tip_desc %></td>
<td><%= link_to 'Show', tip %></td>
<td><%= link_to 'Edit', edit_tip_path(tip) %></td>
<td><%= link_to 'Destroy', tip, confirm: 'Are you sure?', method: :delete %></td>
</tr>
<% end %>
Here are the models:
class Tip < ActiveRecord::Base
belongs_to :user
belongs_to :city
belongs_to :place
end
class Place < ActiveRecord::Base
belongs_to :city
has_and_belongs_to_many :collections
has_many :tips
end
class City < ActiveRecord::Base
has_many :places
has_many :tips
end
Any help will be really appreciated!
Thanks in advance,
James

Answer 1

Suggestions from other guys should work. I'm not sure, but it seems like you don't have objects within specified IDs in your database. That's all :)
Example:
#tips.each do |tip|
tip.city_id # 1
City.find( tip.city_id ) # nil
end