On Thu, Jan 24, 2013 at 10:38 PM, Werner <webagentur.la...@googlemail.com>wrote:
> Jim..sorry.. not my day...
> have to contemplate about your solution.
>
> I wonder..
>
> HourUser.includes(:user).where.....group_by { |h| h.week_id }
>
> <% @hours.keys.sort.each do |h| %>
> <%= @hours[h].collect(&:hour).sum %></td>
> <% end %>
>
> is giving me what I want, just needs to be grouped by user_id
>
> Thanks so far.
>
So given the current solution you have, you also want to group by user_id
right?
so here's how it should go.
@hour_users = HourUser.all.group_by(&:week_id)
gives you a hash with week_ids as keys
@hour_users.each do |week_id, by_week|
by_week.group_by(&:user_id).each do |user_id, hour_users|
hour_users.map(&:hour).sum
end
end
using my first suggestion
@hour_users = HourUser.sum(:hour, group: [:week_id, :user_id])
@hour_users.each do |(week_id, user_id), total_hours|
# do something with week_id, user_id and total_hours
end
Good luck!
>
>
>
> Am Donnerstag, 24. Januar 2013 14:16:16 UTC+1 schrieb jim:
>>
>>
>>
>>
>> On Thu, Jan 24, 2013 at 7:55 PM, Werner <webagent...@googlemail.**com>wrote:
>>
>>> Hi Jim.. thanks so far..
>>>
>>> in the moment this is a bit too far for me.
>>>
>>>
>>> Just remember that to get a certain value, you'll have to pass an array
>>> as the index
>>> ie sums[[33,2]] to get 70
>>> => this is unclear
>>> Pls. be so kind to explain the view part.
>>>
>>
>> since the keys of the hash is an array, you need to use an array as the
>> index to get a value
>>
>> >> sums = { [33, 2] => 70, [34, 2] => 15, [35, 3] => 20 }
>> >> sums[34,2]
>> ArgumentError: wrong number of arguments (2 for 1)
>> from (irb):3:in `[]'
>> from (irb):3
>> >> sums[[34,2]] # 15
>>
>> the keys are defined by the group option you passed to #sum, so if you
>> pass as sql statement to
>> the group option, you'll get that as key. ie (postgre)
>>
>> >> HourUser.sum(:hours, group: "week_id || ' --- ' || user_id", order:
>> :user_id)
>> >> { '33 --- 2' => 70, '34 --- 2' => 15, '35 --- 3' => 20 }
>>
>> hope this helps
>>
>>
>>
>>>
>>> Werner
>>>
>>>
>>>
>>>
>>>
>>>
>>> Am Donnerstag, 24. Januar 2013 11:36:44 UTC+1 schrieb jim:
>>>>
>>>>
>>>>
>>>> On Thu, Jan 24, 2013 at 4:35 PM, Werner
>>>> <webagent...@googlemail.**com>wrote:
>>>>
>>>>> Hi.. I need some support...
>>>>>
>>>>> table:
>>>>> week_id, user_id, project_id, hours
>>>>> ex. =>
>>>>> 33, 2, 1, 10
>>>>> 34, 2,1,15
>>>>> 33, 2, 2, 20
>>>>> 35, 3, 1,20
>>>>> etc.
>>>>
>>>>
>>>>> Want to display a sum of hours per week_id per user_id
>>>>> I have:
>>>>>
>>>>> @hours = HourUser.includes(:user).**group**_by { |h| h.week_id }
>>>>>
>>>>> @hours.keys.sort.each do |hour|
>>>>> @hours[hour].collect(&:**stunden**).sum
>>>>>
>>>>
>>>> Look at http://api.rubyonrails.org/****classes/ActiveRecord/**Calculati
>>>> **ons.html#method-i-sum<http://api.rubyonrails.org/classes/ActiveRecord/Calculations.html#method-i-sum>
>>>>
>>>> sums = HourUser.sum(:hours, group: [:week_id, :user_id], order:
>>>> :user_id)
>>>>
>>>> You'll end up with something like [33, 2] => 70, [34, 2] => 15, [35, 3]
>>>> => 20
>>>> Just remember that to get a certain value, you'll have to pass an array
>>>> as the index
>>>> ie sums[[33,2]] to get 70
>>>>
>>>>
>>>>
>>>>>
>>>>> Hours are summed up, but not sorted by user_id..
>>>>> How to get that?
>>>>>
>>>>> Thanks
>>>>> Werner
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> You received this message because you are subscribed to the Google
>>>>> Groups "Ruby on Rails: Talk" group.
>>>>> To post to this group, send email to rubyonra...@googlegroups.**com.
>>>>> To unsubscribe from this group, send email to rubyonrails-ta...@**
>>>>> googlegroups**.com.
>>>>>
>>>>> To view this discussion on the web visit https://groups.google.com/d/*
>>>>> *ms**g/rubyonrails-talk/-/**nIwEcQd5R**UMJ<https://groups.google.com/d/msg/rubyonrails-talk/-/nIwEcQd5RUMJ>
>>>>> .
>>>>> For more options, visit
>>>>> https://groups.google.com/**grou**ps/opt_out<https://groups.google.com/groups/opt_out>
>>>>> .
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> ------------------------------****------------------------------****-
>>>> visit my blog at http://jimlabs.heroku.com
>>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "Ruby on Rails: Talk" group.
>>> To post to this group, send email to rubyonra...@googlegroups.**com.
>>> To unsubscribe from this group, send email to rubyonrails-ta...@**
>>> googlegroups.com.
>>> To view this discussion on the web visit https://groups.google.com/d/**
>>> msg/rubyonrails-talk/-/**CDisLJSEMNEJ<https://groups.google.com/d/msg/rubyonrails-talk/-/CDisLJSEMNEJ>
>>> .
>>>
>>> For more options, visit
>>> https://groups.google.com/**groups/opt_out<https://groups.google.com/groups/opt_out>
>>> .
>>>
>>>
>>>
>>
>>
>>
>> --
>> ------------------------------**------------------------------**-
>> visit my blog at http://jimlabs.heroku.com
>>
> --
> You received this message because you are subscribed to the Google Groups
> "Ruby on Rails: Talk" group.
> To post to this group, send email to rubyonrails-talk@googlegroups.com.
> To unsubscribe from this group, send email to
> rubyonrails-talk+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msg/rubyonrails-talk/-/rs-cau_8-hcJ.
>
> For more options, visit https://groups.google.com/groups/opt_out.
>
>
>
--
-------------------------------------------------------------
visit my blog at http://jimlabs.heroku.com
--
You received this message because you are subscribed to the Google Groups "Ruby
on Rails: Talk" group.
To post to this group, send email to rubyonrails-talk@googlegroups.com.
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
