Rails Iteration by month given range of dates - ruby-on-rails

Question

I'm trying to follow this Railscast and create a morris.js line chart for my Enquiry model.
I've grouped the counts using date_trunc into months, but now I'm not quite sure at how to get the X-axis to iterate over months (e.g Jun 2012, Jul 2013) as opposed to by date as in the railscasts notes.
I've tried the range#step method here, but now the graph displays only one date (2012-07-01) without a count and nothing else. Commenting out the .step(1.month) method from the range variable and the graph works fine but the x-axis iterates by date.
class Enquiry < ActiveRecord::Base
def self.chart_data(start = 1.year.ago)
total_count = total_count_by_month(start)
start = start.to_date.beginning_of_month
today = Date.today.beginning_of_month
range = (start..today).step(1.month)
range.map do |month|
{
created_at: month,
total_enquiries: total_count[] || 0
}
end
end
def self.total_count_by_month(start)
enquiries = unscoped.where(created_at: start.beginning_of_month..Time.now)
enquiries = enquiries.group("date_trunc('month', created_at)")
enquiries = enquiries.select("date_trunc('month', created_at) as created_at, count(*) as count")
enquiries.each_with_object({}) do |enquiry, counts|
counts[enquiry.created_at.to_date] = enquiry.count
end
end
end
How do I get the chart's x-axis to iterate by months (Jun 2013, Jul 2013 ....) instead of by dates?

Answer 1

For anyone else facing the same problem, the solution is outlined below:
def self.chart_data(start = 1.year.ago)
total_count = total_count_by_month(start)
##############################################
start = start.to_date.beginning_of_month
today = Date.today.beginning_of_month
range = (start..today).select {|d| d.day == 1}
##############################################
range.map do |month|
{
created_at: month,
total_enquiries: total_count[] || 0
}
end
end
The chart's x-axis now iterates by month.
The solution is found here.
I'm still looking for solutions on how the chart dates might display (%b %Y) as opposed to the current format of (yyyy-mm-dd).