Question

I am fetching some rows from the database in my controller with this query :

@main = connection.execute("select code_ver, result from mastertest;")

Now in my html.erb, I am displaying the results in a table like this:

<% @level1.each do |row1| %>
<table id="tbl_main1" name="tbl_main1">
    <tr bgcolor="#D1D1D1">
        <td width="60%" <%= row1[0] %>></td>
        <td width="20%"><%= row1[2] %></td>
        <td width="20%"><%= row1[1] %></td> 
    </tr>
</table>

I am fetching a lot of rows here. But I want to show only say 15 results at once, and have some kind of buttons ‘next’ and ‘previous’ which would cycle through the results. How would I do that ?

Answer 1

I’d suggest creating an Active Record model to represent your mastertest database table. Then, with the help of the will_paginate gem, you could do the following in your controller:

@mastertests = MasterTest.all.paginate(:page => params[:page], :per_page => 15)

And then in your view:

<% @mastertests.each do |mastertest| %>
  <td><%= mastertest.code_ver %></td>
  <td><%= mastertest.result %></td>
<% end %>
<%= will_paginate @mastertests %>

The will_paginate view helper will generate pagination links like [prev] [1] [2] [3] [next]. Take a look at the will_paginate gem on github for more options.