500 Internal Server Error, redmine 2.5.1, MS SQL Server 2012, dmsf 1.4.8-master, dmsf_link.rb #270

app/models/dmsf_file.rb

@@ -44,8 +44,8 @@ class DmsfFile < ActiveRecord::Base
   has_many :referenced_links, :class_name => 'DmsfLink', :foreign_key => 'target_id', 
     :conditions => {:target_type => DmsfFile.model_name}, :dependent => :destroy
   
-  scope :visible, where('NOT deleted')
-  scope :deleted, where('NOT NOT deleted')
+  scope :visible, where(:deleted => false)
+  scope :deleted, where(:deleted => true)
   
   validates :name, :presence => true
   validates_format_of :name, :with => DmsfFolder.invalid_characters,

app/models/dmsf_file_revision.rb

@@ -29,8 +29,8 @@ class DmsfFileRevision < ActiveRecord::Base
   has_many :dmsf_workflow_step_assignment, :dependent => :destroy
 
   # Returns a list of revisions that are not deleted here, or deleted at parent level either  
-  scope :visible, where('NOT deleted')
-  scope :deleted, where('NOT NOT deleted')
+  scope :visible, where(:deleted => false)
+  scope :deleted, where(:deleted => true)
 
   acts_as_customizable
   acts_as_event :title => Proc.new {|o| "#{l(:label_dmsf_updated)}: #{o.file.dmsf_path_str}"},

app/models/dmsf_folder.rb

@@ -45,8 +45,8 @@ class DmsfFolder < ActiveRecord::Base
     :conditions => {:entity_type => 1},
     :dependent => :destroy
   
-  scope :visible, where('NOT deleted')
-  scope :deleted, where('NOT NOT deleted')
+  scope :visible, where(:deleted => false)
+  scope :deleted, where(:deleted => true)
 
   acts_as_customizable
     

app/models/dmsf_link.rb

@@ -27,8 +27,8 @@ class DmsfLink < ActiveRecord::Base
   validates :target_id, :presence => true
   validates_length_of :name, :maximum => 255    
   
-  scope :visible, where('NOT deleted')
-  scope :deleted, where('NOT NOT deleted')
+  scope :visible, where(:deleted => false)
+  scope :deleted, where(:deleted => true)
   
   def target_folder_id
     if self.target_type == DmsfFolder.model_name