scope: add _targetClass to scope property

Store the class of the results returned by a scope find method.
This class is different from the "targetClass" when the relations
is using a third "through" model (e.g. hasAndBelongsToMany).

lib/scope.js

@@ -1,3 +1,4 @@
+var i8n = require('inflection');
 var utils = require('./utils');
 var defineCachedRelations = utils.defineCachedRelations;
 /**
@@ -83,6 +84,10 @@ function defineScope(cls, targetClass, name, params, methods) {
         }
       };
       f._scope = typeof params === 'function' ? params.call(this) : params;
+      f._targetClass = targetClass.modelName;
+      if (f._scope.collect) {
+        f._targetClass = i8n.capitalize(f._scope.collect);
+      }
 
       f.build = build;
       f.create = create;

test/relations.test.js

@@ -117,6 +117,10 @@ describe('relations', function () {
         });
       }
     });
+
+    it('should set targetClass on scope property', function() {
+      should.equal(Book.prototype.chapters._targetClass, 'Chapter');
+    });
   });
 
   describe('belongsTo', function () {
@@ -248,6 +252,9 @@ describe('relations', function () {
       });
     });
 
+    it('should set targetClass on scope property', function() {
+      should.equal(Article.prototype.tags._targetClass, 'Tag');
+    });
   });
 
 });