Auto-assign logged time to budgets

Now that users have a "budget category" assigned to them, we can show
time logged against the correct budget.

Refs #2165

app/helpers/jobs_helper.rb

@@ -7,6 +7,9 @@ module JobsHelper
   end
 
   def progress_bar_for(budget)
-    l_hours_short(budget.hours)
+    progress_bar(budget.done_ratio,
+                 legend: "#{budget.done_ratio}%
+                          (#{l_hours_short(budget.total_time_logged)}/#{l_hours_short(budget.hours)})",
+                 class: "progress")
   end
 end

app/models/job.rb

@@ -35,12 +35,6 @@ class Job < ActiveRecord::Base
     time_budgets.sum(&:hours)
   end
 
-  def time_budget_for(category)
-    return 0 if category.nil? || time_budgets.find_by(category_id: category.id).nil?
-
-    time_budgets.find_by(category_id: category.id).hours
-  end
-
   def total_time_logged
     TimeEntry.where(job_id: id)
              .sum(:hours)

app/models/time_budget.rb

@@ -10,4 +10,18 @@ class TimeBudget < ActiveRecord::Base
 
   belongs_to :job
   belongs_to :category, class_name: "TimeBudgetCategory"
+
+  def done_ratio
+    return 0 if hours.zero?
+
+    (total_time_logged / hours * 100).to_i
+  end
+
+  def total_time_logged
+    TimeEntry.joins(:user)
+             .where(
+               job_id: job_id,
+               users: { time_budget_category_id: category_id }
+             ).sum(:hours)
+  end
 end