i am making a sorting table in rails and getting an error. This is my index.html.erb
<table>
<tr>
<th><%= sortable "name" %></th>
<th><%= sortable "city" %></th>
<th><%= sortable "country" %></th>
<th><%= sortable "street_address" %></th>
<th><%= sortable "sector" %></th>
<th><%= sortable "telephone" %></th>
<th><%= sortable "fax" %></th>
</tr>
<% for company in @companies %>
<tr>
<td><%= company.name %></td>
<td><%= company.city %></td>
<td><%= company.country %></td>
<td><%= company.street_address %></td>
<td><%= company.sector %></td>
<td><%= company.telephone %></td>
<td><%= company.fax %></td>
</tr>
<% end %>
</table>
This is my companies_controller
def index
@companies = Company.order(params[:sort] + ' ' + params[:direction])
end
This is my application_helper
def sortable(column, title = nil)
title ||= column.titleize
direction = (column == params[:sort] && params[:direction] == "asc") ? "desc" : "asc"
link_to title, :sort => column, :direction => direction
end
And the error is:
NoMethodError in CompaniesController#index
undefined method `+' for nil:NilClass
app/controllers/companies_controller.rb:21:in `index'
What is the problem and how can i fix it?
Your
params[:sort]
returnsnil
.You can fix it for example by checking your params: