ruby on rails - Return list based on has_many relationship -

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a state can have many units. unit can have 1 state.

on home page want return list of states have units. right listed name.

so if arizona , colorado ones units...they show on home page.

i'm new rails , i've searched , searched. but, i'm missing something. seems sort of query or filter on controller? returning states have units? appreciated. 

static page controller    def home    @units = unit.all    @states = state.order('long_name')   end    home view  <% @states.each |state| %> <%= link_to state.long_name, state %> <% end %>

join should enough:

@states = state.joins(:units).order('states.long_name asc')

or, can move model scopes:

scope :with_units, joins(:units).order('states.long_name asc')

and call in controller with:

@states = state.with_units

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