Makes related issues available for display and filtering on the issue list (#3239, #3265).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@10513 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/models/issue.rb

@@ -752,7 +752,7 @@ class Issue < ActiveRecord::Base
   end
 
   def relations
-    @relations ||= (relations_from + relations_to).sort
+    @relations ||= IssueRelations.new(self, (relations_from + relations_to).sort)
   end
 
   # Preloads relations for a collection of issues
@@ -775,6 +775,25 @@ class Issue < ActiveRecord::Base
     end
   end
 
+  # Preloads visible relations for a collection of issues
+  def self.load_visible_relations(issues, user=User.current)
+    if issues.any?
+      issue_ids = issues.map(&:id)
+      # Relations with issue_from in given issues and visible issue_to
+      relations_from = IssueRelation.includes(:issue_to => [:status, :project]).where(visible_condition(user)).where(:issue_from_id => issue_ids).all
+      # Relations with issue_to in given issues and visible issue_from
+      relations_to = IssueRelation.includes(:issue_from => [:status, :project]).where(visible_condition(user)).where(:issue_to_id => issue_ids).all
+
+      issues.each do |issue|
+        relations =
+          relations_from.select {|relation| relation.issue_from_id == issue.id} +
+          relations_to.select {|relation| relation.issue_to_id == issue.id}
+
+        issue.instance_variable_set "@relations", IssueRelations.new(issue, relations.sort)
+      end
+    end
+  end
+
   # Finds an issue relation given its id.
   def find_relation(relation_id)
     IssueRelation.find(relation_id, :conditions => ["issue_to_id = ? OR issue_from_id = ?", id, id])