diff --git a/lib/rolify/adapters/active_record/role_adapter.rb b/lib/rolify/adapters/active_record/role_adapter.rb
index a1f01fb3..f3ab4b3a 100644
--- a/lib/rolify/adapters/active_record/role_adapter.rb
+++ b/lib/rolify/adapters/active_record/role_adapter.rb
@@ -104,15 +104,16 @@ def build_conditions(relation, args)
       end
 
       def build_query(role, resource = nil)
-        return [ "#{role_table}.name = ?", [ role ] ] if resource == :any
-        query = "((#{role_table}.name = ?) AND (#{role_table}.resource_type IS NULL) AND (#{role_table}.resource_id IS NULL))"
+        role = [role].flatten
+        return [ "#{role_table}.name IN (?)", [ role ] ] if resource == :any
+        query = "((#{role_table}.name IN (?)) AND (#{role_table}.resource_type IS NULL) AND (#{role_table}.resource_id IS NULL))"
         values = [ role ]
         if resource
           query.insert(0, "(")
-          query += " OR ((#{role_table}.name = ?) AND (#{role_table}.resource_type = ?) AND (#{role_table}.resource_id IS NULL))"
+          query += " OR ((#{role_table}.name IN (?)) AND (#{role_table}.resource_type = ?) AND (#{role_table}.resource_id IS NULL))"
           values << role << (resource.is_a?(Class) ? resource.to_s : resource.class.name)
           if !resource.is_a? Class
-            query += " OR ((#{role_table}.name = ?) AND (#{role_table}.resource_type = ?) AND (#{role_table}.resource_id = ?))"
+            query += " OR ((#{role_table}.name IN (?)) AND (#{role_table}.resource_type = ?) AND (#{role_table}.resource_id = ?))"
             values << role << resource.class.name << resource.id
           end
           query += ")"
diff --git a/lib/rolify/finders.rb b/lib/rolify/finders.rb
index c7306ac4..b9c1e802 100644
--- a/lib/rolify/finders.rb
+++ b/lib/rolify/finders.rb
@@ -14,36 +14,53 @@ def without_role(role_name, resource = nil)
     end
 
     def with_all_roles(*args)
-      users = []
-      parse_args(args, users) do |users_to_add|
-        users = users_to_add if users.empty?
-        users &= users_to_add
-        return [] if users.empty?
-      end
-      users
+      intersect_ars(parse_args(args, :split)).uniq
     end
 
     def with_any_role(*args)
-      users = []
-      parse_args(args, users) do |users_to_add|
-        users += users_to_add
-      end
-      users.uniq
+      union_ars(parse_args(args, :join)).uniq
     end
   end
-  
+
   private
-  
-  def parse_args(args, users, &block)
-    args.each do |arg|
-      if arg.is_a? Hash
-        users_to_add = self.with_role(arg[:name], arg[:resource])
-      elsif arg.is_a?(String) || arg.is_a?(Symbol)
-        users_to_add = self.with_role(arg)
-      else
-        raise ArgumentError, "Invalid argument type: only hash or string or symbol allowed"
+
+  def parse_args(args, mode, &block)
+    normalize_args(args, mode).map do |arg|
+      self.with_role(arg[:name], arg[:resource]).tap do |users_to_add|
+        block.call(users_to_add) if block
       end
-      block.call(users_to_add)
     end
   end
-end
\ No newline at end of file
+
+  # In: [:a, "b", { name: :c, resource: :d }]
+  # Out: [{ name: [:a, "b"] }, { name: :c, resource: :d }]
+  def normalize_args(args, mode)
+    groups = args.group_by(&:class)
+    unless groups.keys.all? { |type| [Hash, Symbol, String].include?(type) }
+      raise ArgumentError, "Invalid argument type: only hash or string or symbol allowed"
+    end
+
+    normalized = [groups[Hash]]
+    sym_str_args = [groups[Symbol], groups[String]].flatten.compact
+    case mode
+    when :join
+      normalized += [{ name: sym_str_args }] unless sym_str_args.empty?
+    when :split
+      normalized += sym_str_args.map { |arg| { name: arg } }
+    end
+
+    normalized.flatten.compact
+  end
+
+
+  def intersect_ars(ars)
+    query = ars.map(&:to_sql).join(" INTERSECT ")
+    from("(#{query}) AS #{table_name}")
+  end
+
+  # http://stackoverflow.com/a/16868735/1202488
+  def union_ars(ars)
+    query = ars.map(&:to_sql).join(" UNION ")
+    from("(#{query}) AS #{table_name}")
+  end
+end
diff --git a/spec/rolify/shared_examples/shared_examples_for_finders.rb b/spec/rolify/shared_examples/shared_examples_for_finders.rb
index 216d12eb..2b39b113 100644
--- a/spec/rolify/shared_examples/shared_examples_for_finders.rb
+++ b/spec/rolify/shared_examples/shared_examples_for_finders.rb
@@ -115,7 +115,7 @@
         end
       end
     end
-    
+
 
     describe ".with_all_roles" do
       it { should respond_to(:with_all_roles) }
@@ -129,6 +129,11 @@
       it { subject.with_all_roles({ :name => "visitor".send(param_method), :resource => Forum.last }, { :name => "moderator".send(param_method), :resource => Group }).should eq([ root ]) }
       it { subject.with_all_roles({ :name => "visitor".send(param_method), :resource => Group.first }, { :name => "moderator".send(param_method), :resource => Forum }).should eq([ modo ]) }
       it { subject.with_all_roles({ :name => "visitor".send(param_method), :resource => :any }, { :name => "moderator".send(param_method), :resource => :any }).should =~ [ root, modo ] }
+
+      it 'should return an AR relation' do
+        subject.with_all_roles("admin".send(param_method), :staff).should be_a(ActiveRecord::Relation)
+        subject.with_all_roles({ :name => "visitor".send(param_method), :resource => :any }, { :name => "moderator".send(param_method), :resource => :any }).should be_a(ActiveRecord::Relation)
+      end
     end
 
     describe ".with_any_role" do
@@ -144,6 +149,11 @@
       it { subject.with_any_role({ :name => "visitor".send(param_method), :resource => Forum.last }, { :name => "moderator".send(param_method), :resource => Group }).should =~ [ root, visitor ] }
       it { subject.with_any_role({ :name => "visitor".send(param_method), :resource => Group.first }, { :name => "moderator".send(param_method), :resource => Forum }).should eq([ modo ]) }
       it { subject.with_any_role({ :name => "visitor".send(param_method), :resource => :any }, { :name => "moderator".send(param_method), :resource => :any }).should =~ [ root, modo, visitor ] }
+
+      it 'should return an AR relation' do
+        subject.with_any_role("admin".send(param_method), :staff, { :name => "moderator".send(param_method), :resource => Group }).should be_a(ActiveRecord::Relation)
+        subject.with_any_role({ :name => "visitor".send(param_method), :resource => :any }, { :name => "moderator".send(param_method), :resource => :any }).should be_a(ActiveRecord::Relation)
+      end
     end
   end
-end
\ No newline at end of file
+end