ruby on rails - Using select_month in form_for -

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i working in ruby on rails , cant figure out how use select_month in form_for. trying is

<%= form_for(@farm) |f| %> <div class="field"> <%= f.label :harvest_start %><br /> <%= select_month(date.today, :field_name => 'harvest_start') %> </div> <div class="actions"> <%= f.submit %> </div> <% end %>

wich outputting 

["harvest_start", nil]

thank help. sorry if formatting incorrect.

(this answered in comments t. weston kendall making proper answer)

the following code got work.

_form.html.erb

<div class="field">   <%= f.label :harvest_start %><br />   <%= f.collection_select :harvest_start, farm::months, :to_s, :to_s, :include_blank => true %> </div>

farms_controller.rb

@farm.harvest_start = params[:harvest_start]

i got select_month work needed :include_blank , didn't want spend time figuring out nil in array.


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