Class: Syncro::Scriber::Observer

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/syncro/scriber/observer.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.from(client, &block) ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 18

def from(client, &block)
  @from_client = client
  result = yield
  @from_client = nil
  result
end

.from_client ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 14

def from_client
  @from_client
end

.method_added(method) ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 9

def method_added(method)
  return unless defined?(ActiveRecord)
  self.observed_methods += [method] if ActiveRecord::Callbacks::CALLBACKS.include?(method.to_sym)
end

Instance Method Details

#add_observer!(klass) ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 71

def add_observer!(klass)
  klass.add_observer(self)
  
  # For ActiveRecord
  self.class.observed_methods.each do |method|
    callback = :"_notify_observers_for_#{method}"
    if (klass.instance_methods & [callback, callback.to_s]).empty?
      klass.class_eval "def #{callback}; notify_observers(:#{method}); end"
      klass.send(method, callback)
    end
  end
end

#after_create(rec) ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 26

def after_create(rec)
  rec.class.record(
    :create, 
    :data        => rec.attributes, 
    :clients     => active_clients(rec),
    :from_client => from_client
  )
end

#after_destroy(rec) ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 48

def after_destroy(rec)
  rec.class.record(
    :destroy, 
    :data        => [rec.id], 
    :clients     => active_clients(rec),
    :from_client => from_client
  )
end

#after_update(rec) ⇒ Object 



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# File 'lib/syncro/scriber/observer.rb', line 35

def after_update(rec)
  changed_to = rec.changes.inject({}) {|hash, (key, (from, to))| 
    hash[key] = to
    hash 
  }
  rec.class.record(
    :update, 
    :data        => [rec.id, changed_to], 
    :clients     => active_clients(rec),
    :from_client => from_client
  )
end

#observed_class_inherited(subclass) ⇒ Object

:nodoc:



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# File 'lib/syncro/scriber/observer.rb', line 67

def observed_class_inherited(subclass) #:nodoc:
  subclass.add_observer(self)
end

#update(observed_method, object) ⇒ Object

:nodoc:



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# File 'lib/syncro/scriber/observer.rb', line 57

def update(observed_method, object) #:nodoc:
  return unless respond_to?(observed_method)
  return unless allowed?(object, observed_method)
  # Is sending to clients disabled, or no clients specified?
  return unless scribe_clients(object)
  # Clients specified, but no non-disabled clients to send too
  return if scribe_clients(object).any? && active_clients(object).empty?
  send(observed_method, object) 
end