Question

I’m performing AJAX search in my Rails application. Here is code from controller:

def show
@website = Website.find(params[:id])
if (current_user.id != @website.user_id)
  redirect_to root_path
  flash[:notice] = 'You are not owner!'
end
if params[:report] && params[:report][:start_date] && params[:report][:end_date]
  @performance_reports = @website.performance_reports.where("created_at between ? and ?", params[:report][:start_date].to_date, params[:report][:end_date].to_date)    
else
  @performance_reports = @website.performance_reports
end

but when I’m trying to generate Excel document it alway goes to branch without params, because there are no params in URL.

One man reccomend me to use this post. I tried to implement it, but couldn’t.

I don’t understand this post enough, I just can’t get where data is passing(spreadsheet gem)

Here is code:

 def export

  @website = Website.last

  @data = @website.performance_reports

  report = Spreadsheet::Workbook.new

  spreadsheet = StringIO.new

  contruct_body(spreadsheet, @data)

  report.write spreadsheet 

  send_data spreadsheet.string, :filename => "yourfile.xls", :type =>  "application/vnd.ms-excel"


 end

and it gives me error:

 undefined method `contruct_body'

Code from view:

    <%= form_tag( url_for, :method => :get, :id => "report") do%>
      ...show action posted above...
     <% end %>

    <%= link_to export_path do%>
     <b>Export</b>
    <% end %>
   ...working code without AJAX...
       <%= link_to url_for(request.parameters.merge({:format => :xls}))  do%>
    <b>Export</b>
    <% end %>

Please tell me where is my mistake or suggest ano

Answer 1

For the first problem, you need to show the view code and the path ajax is taking. Give us more information how the excel is being called.

For the second issue, you need to define that method. Specify how you will populate the spreadsheet with the data. Here is the guide. https://github.com/zdavatz/spreadsheet/blob/master/GUIDE.txt

== Writing is easy
As before, make sure you have Spreadsheet required and the client_encoding
set. Then make a new Workbook:

  book = Spreadsheet::Workbook.new

Add a Worksheet and you’re good to go:

  sheet1 = book.create_worksheet

This will create a Worksheet with the Name “Worksheet1”. If you prefer another
name, you may do either of the following:

  sheet2 = book.create_worksheet :name => 'My Second Worksheet'
  sheet1.name = 'My First Worksheet'

Now, add data to the Worksheet, using either Worksheet#[]=,
Worksheet#update_row, or work directly on Row using any of the Array-Methods
that modify an Array in place:

  sheet1.row(0).concat %w{Name Country Acknowlegement}
  sheet1[1,0] = 'Japan'
  row = sheet1.row(1)
  row.push 'Creator of Ruby'
  row.unshift 'Yukihiro Matsumoto'
  sheet1.row(2).replace [ 'Daniel J. Berger', 'U.S.A.',
                          'Author of original code for Spreadsheet::Excel' ]
  sheet1.row(3).push 'Charles Lowe', 'Author of the ruby-ole Library'
  sheet1.row(3).insert 1, 'Unknown'
  sheet1.update_row 4, 'Hannes Wyss', 'Switzerland', 'Author'

Add some Formatting for flavour:

  sheet1.row(0).height = 18

  format = Spreadsheet::Format.new :color => :blue,
                                   :weight => :bold,
                                   :size => 18
  sheet1.row(0).default_format = format

  bold = Spreadsheet::Format.new :weight => :bold
  4.times do |x| sheet1.row(x + 1).set_format(0, bold) end

And finally, write the Excel File:

  book.write '/path/to/output/excel-file.xls'