fixes #2480: Report for contributors

app/logical/reports/contributors.rb

@@ -0,0 +1,9 @@
+require 'statistics2'
+
+module Reports
+  class Contributors < User
+    def users
+      ::User.where("users.level >= ? and users.post_upload_count >= 250", ::User::Levels::CONTRIBUTOR).order("created_at desc").limit(50).map {|x| Reports::UserPromotions::User.new(x)}
+    end
+  end
+end

app/logical/reports/user_promotions.rb

@@ -30,16 +30,17 @@ module Reports
     def self.confidence_interval_for(user, n)
       up_votes = Post.where("created_at >= ?", min_time).where(:is_deleted => false, :uploader_id => user.id).where("score >= ?", n).count
       total_votes = Post.where("created_at >= ?", min_time).where(:uploader_id => user.id).count
-      ci_lower_bound(up_votes, total_votes, 0.95)
+      ci_lower_bound(up_votes, total_votes)
     end
 
-    def self.deletion_confidence_interval_for(user)
-      deletions = Post.where(:uploader_id => user.id, :is_deleted => true).count
-      total = Post.where(:uploader_id => user.id).count
-      ci_lower_bound(deletions, total, 0.95)
+    def self.deletion_confidence_interval_for(user, days = nil)
+      date = (days || 30).days.ago
+      deletions = Post.where("created_at >= ?", date).where(:uploader_id => user.id, :is_deleted => true).count
+      total = Post.where("created_at >= ?", date).where(:uploader_id => user.id).count
+      ci_lower_bound(deletions, total)
     end
 
-    def self.ci_lower_bound(pos, n, confidence)
+    def self.ci_lower_bound(pos, n, confidence = 0.95)
       if n == 0
         return 0
       end