Class: AuditedModelsObserver

Inherits:
ActiveRecord::Observer
  • Object
show all
Defined in:
lib/audit_log/observer.rb

Defined Under Namespace

Classes: WhatBuilder

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#controller ⇒ Object

Returns the value of attribute controller.



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# File 'lib/audit_log/observer.rb', line 3

def controller
  @controller
end

Class Method Details

.observed_classes ⇒ Object 



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# File 'lib/audit_log/observer.rb', line 5

def self.observed_classes
  AuditLog::Mapping.instance.audit_mappings.keys.collect{|model_as_symbol| model_as_symbol.to_s.camelize.constantize}
end

Instance Method Details

#after_create(model) ⇒ Object 



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# File 'lib/audit_log/observer.rb', line 14

def after_create(model)
  if self.controller && self.controller.audited_model == model
    logged_model = LoggedModel.new(
      who: self.controller.current_user_for_audit_log ? self.controller.current_user_for_audit_log.id : nil,
      what: YAML.dump({id: model.id, event: :create}),
      model_class_name: model.class.name,
      model_id: model.id
    )    
    logged_model.save
  end
end

#after_update(model) ⇒ Object 



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# File 'lib/audit_log/observer.rb', line 46

def after_update(model)
  if self.controller && self.controller.audited_model == model
    changes = Thread.current[:audited_model_changes]
    
    if changes
      what = WhatBuilder.new(changes).build
      
      logged_model = LoggedModel.new(
        who: self.controller.current_user_for_audit_log ? self.controller.current_user_for_audit_log.id : nil,
        what: YAML.dump(what),
        model_class_name: model.class.name,
        model_id: model.id
      )    
      logged_model.save
    end
    
    self.controller.audited_model = nil
  end
end

#before_destroy(model) ⇒ Object 



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# File 'lib/audit_log/observer.rb', line 27

def before_destroy(model)
  set_model_to_audit(model)
  
  if self.controller && self.controller.audited_model == model
    what = {id: model.id, event: :destroy}
    what = what.merge(ActiveSupport::JSON.decode(model.to_json(root: false, include: association_audit_loggers(model))))
    
    logged_model = LoggedModel.new(
      who: self.controller.current_user_for_audit_log ? self.controller.current_user_for_audit_log.id : nil,
      what: YAML.dump(what),
      model_class_name: model.class.name,
      model_id: model.id
    )    
    logged_model.save
    
    self.controller.audited_model = nil
  end
end

#before_update(model) ⇒ Object 



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# File 'lib/audit_log/observer.rb', line 66

def before_update(model)
  if self.controller && self.controller.audited_model == model
    if (model.changed? && !(model.changed_attributes.keys.collect{|attr| attr.to_sym}.uniq.sort - ignored_fields(model).uniq.sort).empty?) || 
        has_some_association_changed?(model)
      changes = {model: model, fields_updates: {}, has_many: {}, has_one: {}}
      
      # build main model changes
      model.changed_attributes.
        select{|attribute| attribute != "updated_at" && !ignored_fields(model).include?(attribute.to_sym)}.
        each{|attribute, old_value|
        changes[:fields_updates][attribute.to_sym] = {from: old_value, to: model.send(attribute.to_sym)}
      }  
      
      # build has_many model creations
      association_audit_loggers(model).select{|association| model.send(association).kind_of?(ActiveRecord::Associations::CollectionProxy)}.each{|method_name| 
        changes[:has_many][method_name.to_sym] ||= []
        
        model.send(method_name).select{|a| a.new_record?}.each{|nested|
          changes[:has_many][method_name.to_sym] << {model: nested, event: :create}
        }
      }
      
      # build has_many model updates
      association_audit_loggers(model).select{|association| model.send(association).kind_of?(ActiveRecord::Associations::CollectionProxy)}.each{|method_name| 
        changes[:has_many][method_name.to_sym] ||= []
        
        model.send(method_name).select{|a| a.changed? && !a.new_record?}.each{|nested|
          nested_changes = {model: nested, fields_updates: {}, event: :update}
          changes[:has_many][method_name.to_sym] << nested_changes
          
          nested.changed_attributes.
            select{|attribute| attribute != "updated_at"}.
            each{|attribute, old_value|
            nested_changes[:fields_updates][attribute.to_sym] = {from: old_value, to: nested.send(attribute.to_sym)}
          }  
        }
      }
      
      # build has_many model deletions
      association_audit_loggers(model).select{|association| model.send(association).kind_of?(ActiveRecord::Associations::CollectionProxy)}.each{|method_name| 
        changes[:has_many][method_name.to_sym] ||= []
        
        model.send(method_name).select{|a| a.marked_for_destruction?}.each{|nested|
          changes[:has_many][method_name.to_sym] << {model: nested, event: :destroy}
        }
      }

      
      # build has_one model creations
      association_audit_loggers(model).select{|association| !model.send(association).kind_of?(ActiveRecord::Associations::CollectionProxy) && !model.send(association).nil?}.each{|method_name| 
        has_one_model = model.send(method_name)
        
        if has_one_model.new_record?
          changes[:has_one][method_name.to_sym] = {model: has_one_model, event: :create}
        elsif has_one_model.changed?
          has_one_changes = {model: has_one_model, event: :update, fields_updates: {}}
          has_one_model.changed_attributes.
            select{|attribute| attribute != "updated_at"}.
            each{|attribute, old_value|
            has_one_changes[:fields_updates][attribute.to_sym] = {from: old_value, to: has_one_model.send(attribute.to_sym)}
          }  
          
          changes[:has_one][method_name.to_sym] = has_one_changes
        elsif has_one_model.marked_for_destruction?
          changes[:has_one][method_name.to_sym] = {model: has_one_model, event: :destroy}
        end
      }
      
      Thread.current[:audited_model_changes] = changes
    end
  end
end

#before_validation(model) ⇒ Object 



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# File 'lib/audit_log/observer.rb', line 10

def before_validation(model)
  set_model_to_audit(model)
end