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Editorial Team
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Asked: 2026-06-18T06:39:41+00:00

I am building a webapp using Rails 3.2.8. In this app I got three

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I am building a webapp using Rails 3.2.8.
In this app I got three tables. Projects, Tasks and Subtasks.

Projects

id, name

Tasks

id, name, project_id

Subtasks

id, name, desc, task_id, value

I would like to get all subtasks that belongs to a project and sum up the values and group them by created_at.

This is what I try but it does not work (only get a AR relation back).

@tasks = @project.tasks.joins(:subtasks).select('sum(subtasks.value)').group('subtasks.created_at')

What am I doing wrong?

Thankful for all help!

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1 Answer

  1. Editorial Team

    I think you’re closer than you realize.

    Each of the methods in the chain you have provided result in ActiveRecord::Relation. All you need to do is call all or each or some other method to force it to execute the query.

    I think you also meant to group by tasks.created_at?

    Finally, I’d recommend you created a class method in the Task model to simplify this a little.

    I hope that helps.

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