add generic builder

app/builders/attribute_builder.rb

 class AttributeBuilder < Builder
-  extend RepositoriesProxy
-
   ##
   # receive a list of ids and return a list of attributes
   #

app/builders/builder.rb

 class Builder
+  extend RepositoriesProxy
 
   protected
 

app/builders/collection_builder.rb

 class CollectionBuilder < Builder
-  extend RepositoriesProxy
-
   ##
   # Receive a list of ids and return a list of collections
   # Each element, must be a Hash with rid and last_modified

app/builders/complaint_builder.rb

 class ComplaintBuilder < Builder
-  extend RepositoriesProxy
-
   ##
   # receive a list of ids and return a list of complaints
   #

app/builders/generic_builder.rb

+class GenericBuilder < Builder
+  ##
+  # receive a list of ids and return a list of learning objects
+  # useful for search pagination
+  #
+  def self.build(objects = [])
+    build_array(objects, true, 'rid')
+  end
+
+  private
+
+  def self.build_array(objects = [], cache = true, id = '@rid', last_modified = 'last_modified')
+    array = []
+    objects = [objects] if objects.class == String || objects.class == Hash
+    objects.each do |object|
+      next if object[id].blank?
+
+      if cache && !object[last_modified].blank?
+        o = Rails.cache.fetch(cache_key(object[id], object[last_modified]))
+      end
+
+      o = repository(object['@class']).find object[id] if o.nil?
+      array << o
+    end
+    array
+  end
+
+  def repository(klass)
+    case klass
+    when 'Attribute' then attribute_repository
+    when 'Collection' then collection_repository
+    when 'Complaint' then complaint_repository
+    when 'Institution' then institution_repository
+    when 'LearningObject' then learning_object_repository
+    when 'Subject' then subject_repository
+    else nil
+    end
+  end
+
+end

app/builders/institution_builder.rb

 class InstitutionBuilder < Builder
-  extend RepositoriesProxy
-
   ##
   # receive a list of ids and return a list of institutions
   #

app/builders/learning_object_builder.rb

 class LearningObjectBuilder < Builder
-  extend RepositoriesProxy
-
   ##
   # receive a list of ids and return a list of learning objects
   # useful for search pagination

app/builders/subject_builder.rb

 class SubjectBuilder < Builder
-  extend RepositoriesProxy
-
   ##
   # receive a list of ids and return a list of subjects
   #