I found the way to do that as follows:
either by defining a scope in the Timesheet model:
scope :all_by_start_date,
joins(:time_entries).select("timesheets.start_date,
sum(time_entries.worktime) as total_days").group('timesheets.start_date')
or the same and full console syntax to check it console:
Timesheet.joins(:time_entries).select("timesheets.start_date,
sum(time_entries.worktime) as total_days").group('timesheets.start_date')
Hope this helps.
On Saturday, March 30, 2013 6:08:32 PM UTC+1, Serguei Cambour wrote:
>
> The below query fails:
>
> Timesheet.joins(:time_entries).select("timesheets.*,
> sum(time_entries.worktime) as total").group("timesheets.start_date")
>
> The models have the following relations:
>
> Timesheet < AR
> has_many :activities, dependent: :destroy, inverse_of: :timesheet
> has_many :time_entries, through: :activities
> accepts_nested_attributes_for :activities, allow_destroy: true
> end
>
> class Activity < AR
> belongs_to :timesheet, inverse_of: :activities
> belongs_to :task
> has_many :time_entries, order: :workdate, dependent: :destroy,
> inverse_of: :activity
> accepts_nested_attributes_for :time_entries, allow_destroy: true,
> reject_if: proc { |a| a[:worktime].blank? }
> end
>
> class TimeEntry < AR
> belongs_to :activity, :inverse_of => :time_entries
> end
>
> How is it possible to group all the time sheets by their start_date and
> sum the work time ?
>
> Thank you.
>
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