Index: app/controllers/issue_relations_controller.rb
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- app/controllers/issue_relations_controller.rb	(revision ad37098676177d2e30dae0dcc7575b0c93769274)
+++ app/controllers/issue_relations_controller.rb	(revision 27923fae6ba1509f770a95a3609c01f73288732b)
@@ -44,16 +44,24 @@
   end
 
   def create
-    @relation = IssueRelation.new
-    @relation.issue_from = @issue
-    @relation.safe_attributes = params[:relation]
-    @relation.init_journals(User.current)
+    saved = nil
+    bulk_relations ||= []
+
+    relation_issues_to_id.each do |issue_to_id|
+      @relation = IssueRelation.new
+      @relation.issue_from = @issue
+      @relation.safe_attributes = params[:relation]
+      @relation.issue_to = Issue.visible(User.current).find_by_id(issue_to_id.delete('^0-9'))
+      @relation.init_journals(User.current)
 
-    begin
-      saved = @relation.save
-    rescue ActiveRecord::RecordNotUnique
-      saved = false
-      @relation.errors.add :base, :taken
+      begin
+        saved = @relation.save
+      rescue ActiveRecord::RecordNotUnique
+        saved = false
+        @relation.errors.add :base, :taken
+      end
+      bulk_relations << @relation
+      @relation_errors = bulk_relations.map {|o| o.errors.full_messages}.flatten
     end
 
     respond_to do |format|
@@ -97,4 +105,15 @@
   rescue ActiveRecord::RecordNotFound
     render_404
   end
+
+  def relation_issues_to_id
+    issue_to_id = params[:relation].require(:issue_to_id)
+    issue_to_id = issue_to_id.scan(/#?[0-9]+,?/)
+    raise Unauthorized if issue_to_id.size.zero?
+
+    issue_to_id
+  rescue ActionController::ParameterMissing => e
+    render_error(:message => e.message, :status => 400)
+    []
+  end
 end
Index: app/models/issue_relation.rb
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- app/models/issue_relation.rb	(revision ad37098676177d2e30dae0dcc7575b0c93769274)
+++ app/models/issue_relation.rb	(revision 27923fae6ba1509f770a95a3609c01f73288732b)
@@ -89,15 +89,8 @@
     end
 
     return unless attrs.is_a?(Hash)
+
     attrs = attrs.deep_dup
-
-    if issue_id = attrs.delete('issue_to_id')
-      if issue_id.to_s.strip.match(/\A#?(\d+)\z/)
-        issue_id = $1.to_i
-        self.issue_to = Issue.visible(user).find_by_id(issue_id)
-      end
-    end
-
     super(attrs)
   end
 
Index: app/views/issue_relations/_form.html.erb
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- app/views/issue_relations/_form.html.erb	(revision ad37098676177d2e30dae0dcc7575b0c93769274)
+++ app/views/issue_relations/_form.html.erb	(revision 27923fae6ba1509f770a95a3609c01f73288732b)
@@ -1,4 +1,4 @@
-<%= error_messages_for 'relation' %>
+<%= render_error_messages(@relation_errors) if @relation_errors %>
 
 <p><%= f.select :relation_type, collection_for_relation_type_select, {}, :onchange => "setPredecessorFieldsVisibility();" %>
 <%= l(:label_issue) %> #<%= f.text_field :issue_to_id, :size => 10 %>
Index: test/functional/issue_relations_controller_test.rb
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- test/functional/issue_relations_controller_test.rb	(revision ad37098676177d2e30dae0dcc7575b0c93769274)
+++ test/functional/issue_relations_controller_test.rb	(revision 27923fae6ba1509f770a95a3609c01f73288732b)
@@ -55,6 +55,43 @@
     assert_equal 'relates', relation.relation_type
   end
 
+  def test_bulk_create
+    assert_difference 'IssueRelation.count', +3 do
+      post :create, :params => {
+          :issue_id => 1,
+          :relation => {
+              :issue_to_id => '2,3,7',
+              :relation_type => 'relates',
+              :delay => ''
+          }
+      }
+    end
+    relations = IssueRelation.where(:issue_from_id => 1, :issue_to_id => [2,3,7])
+    assert_equal 3, relations.count
+    # all relations types should be 'relates'
+    relations.map { |r| assert_equal 'relates', r.relation_type }
+  end
+
+  def test_bulk_create_should_show_errors
+      assert_difference 'IssueRelation.count', +3 do
+        post :create, :params => {
+            :issue_id => 1,
+            :relation => {
+                :issue_to_id => '2,3,4,5,7',
+                :relation_type => 'relates',
+                :delay => ''
+            }
+        },
+        :xhr => true
+      end
+      assert_response :success
+      assert_equal 'text/javascript', response.media_type
+
+      # issues #4 and #5 can't be related by default
+      assert_include 'Related issue cannot be blank', response.body
+      assert_include 'Related issue doesn&#39;t belong to the same project', response.body
+  end
+
   def test_create_on_invalid_issue
     assert_no_difference 'IssueRelation.count' do
       post :create, :params => {