Getting strange error when searching by date - ruby-on-rails

Question

I'm trying to make report page, on which user will choose start and end date and push buttopn report. Then hidden div became visible.
My search isn't on partial.
I am using jquery_datepicker so here is my code from view:
<%= form_tag(:controller => "financial_reports", :action => "index", :method => "post")%>
<%= datepicker_input "financial_report","start_date", :dateFormat => "dd/mm/yy" %>
<%= datepicker_input "financial_report","end_date", :dateFormat => "dd/mm/yy" %>
<%= submit_tag "Run Report"%>
<% end %>
Here is my code from controller:
def search
#financial_reports = current_user.financial_reports.search(params[:start_date], params[:end_date]
render :index
end
In my Model:
def self.search(from,to)
find(:all, :conditions => [ "BETWEEN ? AND ?", from, to])
end
And it gives me error:
ActiveRecord::StatementInvalid in FinancialReportsController#search
SELECT `financial_reports`.* FROM `financial_reports` WHERE `financial_reports`.`user_id` = 67 AND (BETWEEN NULL AND NULL)
and below this:
Parameters:
{"utf8"=>"✓",
"authenticity_token"=>"AMobLLRV3aAlNn6b4Au+1nRP2AN1TLQcBCytBXhDA/g=",
"type"=>"",
"financial_report"=>{"start_date"=>"05/08/2012",
"end_date"=>"11/08/2012"},
"commit"=>"Run Report",
"method"=>"post"}
Where is my error ?

Answer 1

If both parameters are set at all times, you can use:
#financial_reports = current_user.financial_reports.where(:created_at => ((params[:start_date].to_date)..(params[:end_date].to_date))
If that's not the case, you could (for example) do this:
#financial_reports = current_user.financial_reports
if params[:start_date].present?
#financial_reports = current_user.financial_reports.where("created_at >= ?", params[:start_date])
end
if params[:end_date].present?
#financial_reports = current_user.financial_reports.where("created_at <= ?", params[:end_date])
end
You will probably want to encapsulate this in scopes.