adding joins clause to accessible_by when conditions are across associations

spec/cancan/active_record_additions_spec.rb

@@ -10,19 +10,19 @@ describe CanCan::ActiveRecordAdditions do
   end
   
   it "should call where(:id => nil) when no ability is defined so no records are found" do
-    stub(@model_class).where(:id => nil) { :no_where }
+    stub(@model_class).where(:id => nil).stub!.joins(nil) { :no_where }
     @model_class.accessible_by(@ability, :read).should == :no_where
   end
   
   it "should call where with matching ability conditions" do
-    @ability.can :read, @model_class, :foo => 1
-    stub(@model_class).where(:foo => 1) { :found_records }
+    @ability.can :read, @model_class, :foo => {:bar => 1}
+    stub(@model_class).where(:foo => { :bar => 1 }).stub!.joins([:foo]) { :found_records }
     @model_class.accessible_by(@ability, :read).should == :found_records
   end
   
   it "should default to :read ability and use scoped when where isn't available" do
-    @ability.can :read, @model_class, :foo => 1
-    stub(@model_class).scoped(:conditions => {:foo => 1}) { :found_records }
+    @ability.can :read, @model_class, :foo => {:bar => 1}
+    stub(@model_class).scoped(:conditions => {:foo => {:bar => 1}}, :joins => [:foo]) { :found_records }
     @model_class.accessible_by(@ability).should == :found_records
   end
 end

spec/cancan/can_definition_spec.rb

@@ -0,0 +1,33 @@
+require "spec_helper"
+
+describe CanCan::CanDefinition do
+  before(:each) do
+    @conditions = {}
+    @can = CanCan::CanDefinition.new(true, :read, Integer, @conditions, nil)
+  end
+  
+  it "should return no association joins if none exist" do
+    @can.association_joins.should be_nil
+  end
+
+  it "should return no association for joins if just attributes" do
+    @conditions[:foo] = :bar
+    @can.association_joins.should be_nil
+  end
+
+  it "should return single association for joins" do
+    @conditions[:foo] = {:bar => 1}
+    @can.association_joins.should == [:foo]
+  end
+
+  it "should return multiple associations for joins" do
+    @conditions[:foo] = {:bar => 1}
+    @conditions[:test] = {1 => 2}
+    @can.association_joins.map(&:to_s).sort.should == [:foo, :test].map(&:to_s).sort
+  end
+
+  it "should return nested associations for joins" do
+    @conditions[:foo] = {:bar => {1 => 2}}
+    @can.association_joins.should == [{:foo => [:bar]}]
+  end
+end