Well.. I cant get it working
Try to explain it again..
db_table:
week_id, project_id, user_id, hour
ex. =>
33, 1, 1, 10
33, 4, 1, 20
33, 1, 2, 0
34, 1, 2, 15
34, 1, 1, 0
So, user with the id 1 worked 10 hours in week 33 and 20 in the week 33,
but other project
I want to show all hours summed up per week per user
row1(user1) => week 33 => 30, week 34 => 0
row2(user2) => week 33 => 0, week 34 => 15
Step one:
I want one row per user, so I group:
@hours = HourUser.all.group_by(&:user_id)
view:
@hours.each do |user, weeks|
gives me each user in one <tr>
within this row, each week one cell
<% weeks.group_by(&:week_id).each do |week, hours| %>
<td><%= hours.map(&:hour).sum %>
Shows the hours but not summed up. Instead I get :
row 1 => ...10.. and does not stop the row but starts again with ... 20...
row 2 => ...0 15
How to? Do I also have to group otherwise..?
Thanks for support.
Am Donnerstag, 24. Januar 2013 16:01:06 UTC+1 schrieb jim:
>
>
>
>
> On Thu, Jan 24, 2013 at 10:38 PM, Werner
> <webagent...@googlemail.com<javascript:>
> > 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
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> --
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>>>>>> .
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>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ------------------------------****------------------------------****-
>>>>> visit my blog at http://jimlabs.heroku.com
>>>>>
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