rails how to save date_select field value in date field in db -


i have date_select in form:

<%= f.date_select :birthdate, {:start_year => time.now.year - 100} %>

i have field

t.date "birthdate"

how can save value selected in date_select database (@user.birthdate)? (without using gems datepicker)

try saving 

@user.brithdate = date.new(params[:user]["birthdate(1i)"].to_i,params[:user]["birthdate(2i)"].to_i,params[:user]["birthdate(3i)"].to_i) @user.save

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