has_many through rails

Question

Hi,

Country Model

set_table_name "countries"

has_many :states, :primary_key => 'col1', :foreign_key => 'col1'

has_many :cities, :through => :states, :primary_key => 'col1', :foreign_key => 'col1'

State Model

set_table_name "strain_appendices"  

belongs_to :country

has_many :states, :primary_key => 'col2', :foreign_key => 'col2'

City Model

set_table_name "ssu_accessions"

belongs_to :country

belongs_to :state

View

<% @countries.each do |country| %>

<%= country.high %>

<% country.states.each do |state| %>

<%= state.high %>

<% country.cities.each do |city| %>

<%= city.high %>

<%= country.high %> and <%= state.high %> give nice output. But, <%= city.high %> shows error as "uninitialized constant Country::City". Where may be the problem? Anybody help me.

Answer 1

Unless you define a method named high in City model or there's a high attribute, you'll get this error.

Maybe you're looking for city.country.high or city.state.high.

Edit

I'm sorry, I misread! As Shadwell said, you'd get another error in the situation described above.

Answer 2

In the State model, you are missing this:

has_many :cities