Question

I have 3 tables: Projects, Tasks, Timeentries
Projects has_many tasks and has_many timeentries, :through => tasks
Tasks has_many timeentries.

In the Projects index, I would like to show a sum of all the timeentries for the project.

I’m trying to use:

<td><%= @project.tasks.timeentries.sum('time_entry') %></td>

But, I get undefined method `tasks’ for nil:NilClass

Any ideas?

Thanks

Answer 1

as Benjamin Udink ten Cate pointed out, most likely your instance variable is named @projects
if you are doing a traversing through projects like <%for project in @projects%> than you should be using project and not @project