Rails downloading empty csv file - ruby-on-rails

Question

I have a problem with Downloading csv files from my rails app.
First the controller looks like this;
def report
#report = SentMessage.where('user_id = ? AND created_at <= ? AND created_at >= ?', current_user.id, params[:before], params[:after]).order('created_at Desc')
respond_to do |format|
format.html
format.csv do
response.headers["Content-Type"] = "text/csv; charset=UTF-8; header=present"
response.headers["Content-Disposition"] = "attachment; filename=sent_messages.csv"
end
end
end
then my report.csv.erb file looks like this;
<%= provide(:title, "Sent Messages") %>
<div>
<div class="panel radius"> <h2 class="text_center">Sent Messages</h2></div>
<table class="table table-striped table-bordered table-hoverlarge-12 radius columns large-centered" id="sent_table">
<thead>
<tr>
<th>To</th>
<th>From</th>
<th>Message</th>
<th>Delivery Report</th>
<th>cost</th>
<th>Time</th>
</tr>
</thead>
<tbody>
<% #report.each do |message| %>
<tr>
<td><%= message.to %></td>
<td><%= message.from %></td>
<td><%= message.message %></td>
<td><%= message.delivery %></td>
<td><%= message.cost %></td>
<td><%= message.created_at.to_datetime.strftime("%b %d, %Y %I:%M%P") %></td>
</tr>
<% end %>
</tbody>
</table>
</div>
</div>
When i click the download link, the downloaded file is just empty besides the headers as show in the report.csv.erb file.
What could be the problem?

Answer 1

I simply had to change the link to the download from;
to
<%= link_to "Download CSV", params.merge(format: "csv"), class: "button radius" %>
And it worked.

Answer 2

Do like that may be work for you.
def report
#report = SentMessage.where('user_id = ? AND created_at <= ? AND created_at >= ?', current_user.id, params[:before], params[:after]).order('created_at Desc')
respond_to do |format|
format.html
format.csv{
response.headers["Content-Type"] = "text/csv; charset=UTF-8; header=present"
response.headers["Content-Disposition"] = "attachment; filename=sent_messages.csv"}
end
end