Class: Store

Inherits:
Model show all
Defined in:
lib/volt/models/store.rb

Constant Summary collapse

ID_CHARS = 
[('a'..'z'), ('A'..'Z'), ('0'..'9')].map {|v| v.to_a }.flatten
@@identity_map = 
{}

Instance Attribute Summary

Attributes inherited from Model

#attributes, #parent, #path

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Model

#!, #<<, #==, #assign_attribute, #delete, #expand!, #false?, #inspect, #nil?, #read_attribute, #return_undefined_method, #trigger_by_attribute!, #true?

Methods included from ObjectTracking

#__setup_tracking

Methods included from ModelWrapper

#wrap_value, #wrap_values

Methods included from ReactiveTags

included, #reactive_method_tag

Constructor Details

#initialize(tasks = nil, *args) ⇒ Store

Returns a new instance of Store.



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# File 'lib/volt/models/store.rb', line 8

def initialize(tasks=nil, *args)
  @tasks = tasks

  super(*args)
  
  track_in_identity_map if attributes && attributes['_id']
  
  value_updated
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(method_name, *args, &block) ⇒ Object 



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# File 'lib/volt/models/store.rb', line 65

def method_missing(method_name, *args, &block)
  result = super
  
  if method_name[0] == '_' && method_name[-1] == '='
    # Trigger value updated after an assignment
    self.value_updated
  end
  
  return result
end

Class Method Details

.update(model_id, data) ⇒ Object 



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# File 'lib/volt/models/store.rb', line 45

def self.update(model_id, data)
  model = @@identity_map[model_id]
  
  if model
    data.each_pair do |key, value|
      if key != '_id'
        puts "update #{key} with #{value.inspect}"
        model.send(:"#{key}=", value)
      end
    end
  end
end

Instance Method Details

#collection(path = nil) ⇒ Object 



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# File 'lib/volt/models/store.rb', line 107

def collection(path=nil)
  path ||= self.path
  
  collection_name = path.last
  collection_name = path[-2] if collection_name == :[]
  
  return collection_name
end

#ensure_id ⇒ Object

When called, will setup an id if there is not one



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# File 'lib/volt/models/store.rb', line 81

def ensure_id
  # No id yet, lets create one
  if attributes && !attributes['_id']
    self.attributes['_id'] = generate_id
    track_in_identity_map
  end
end

#event_added(event, scope_provider, first) ⇒ Object

def _id

return attributes && attributes['_id']

end



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# File 'lib/volt/models/store.rb', line 22

def event_added(event, scope_provider, first)
  if first && event == :changed
    # Start listening
    ensure_id
    if self.attributes && self.path.size > 1
      channel_name = "#{self.path[-2]}##{self.attributes['_id']}"
      puts "LISTENER ON: #{channel_name.inspect} -- #{self.path.inspect}"
      $page.tasks.call('ChannelTasks', 'add_listener', channel_name)
    end
  end
end

#event_removed(event, no_more_events) ⇒ Object 



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# File 'lib/volt/models/store.rb', line 34

def event_removed(event, no_more_events)
  if no_more_events && event == :changed
    # Stop listening
    if self.attributes && self.path.size > 1
      channel_name = "#{self.path[-2]}##{self.attributes['_id']}"
      puts "REMOVE LISTENER ON: #{channel_name}"
      $page.tasks.call('ChannelTasks', 'remove_listener', channel_name)
    end
  end
end

#generate_id ⇒ Object 



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# File 'lib/volt/models/store.rb', line 58

def generate_id
  id = []
  12.times { id << ID_CHARS.sample }
  
  return id.join
end

#new_array_model(*args) ⇒ Object 



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# File 'lib/volt/models/store.rb', line 161

def new_array_model(*args)
  StoreArray.new(@tasks, *args)
end

#new_model(attributes = {}, parent = nil, path = nil, class_paths = nil) ⇒ Object 



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# File 'lib/volt/models/store.rb', line 129

def new_model(attributes={}, parent=nil, path=nil, class_paths=nil)
  model = Store.new(@tasks, attributes, parent, path, class_paths)

  if @tasks && path.last[-1] == 's'
    # puts "FIND NEW MODEL: #{path.inspect} - #{attributes.inspect}"
    
    # Check to see the parents scope so we can only lookup associated
    # models.
    scope = {}
    
    if parent.attributes && parent.attributes['_id'].true?
      scope[path[-1].singularize + '_id'] = parent._id
    end
    
    puts "FIND: #{collection(path).inspect} at #{scope.inspect}"
    @tasks.call('StoreTasks', 'find', collection(path), scope) do |results|
      # TODO: Globals evil, replace
      $loading_models = true
      results.each do |result|
        # Get model again, we need to fetch it each time so it gets the
        # updated model when it switches from nil.
        # TODO: Strange that this is needed
        model = self.send(path.last)
        model << Store.new(@tasks, result, model, path + [:[]], class_paths)
      end
      $loading_models = false
    end
  end
  
  return model
end

#read_new_model(method_name) ⇒ Object

On stores, we store the model so we don’t have to look it up every time we do a read.



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# File 'lib/volt/models/store.rb', line 118

def read_new_model(method_name)
  model = new_model(nil, self, path + [method_name])
  
  self.attributes ||= {}
  attributes[method_name] = model
  
  return model
end

#track_in_identity_map ⇒ Object 



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# File 'lib/volt/models/store.rb', line 76

def track_in_identity_map
  @@identity_map[attributes['_id']] = self
end

#value_updated ⇒ Object 



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# File 'lib/volt/models/store.rb', line 89

def value_updated
  # puts "VU: #{@tasks.inspect} = #{path.inspect} - #{attributes.inspect}"
  if (!defined?($loading_models) || !$loading_models) && @tasks && path.size > 0 && !self.nil?
    
    ensure_id
    
    if path.size > 2 && parent && source = parent.parent
      self.attributes[path[-2].to_s.singularize+'_id'] = source._id
    end
    
    # Don't store any sub-stores, those will do their own saving.
    attrs = attributes.reject {|k,v| v.is_a?(Model) || v.is_a?(ArrayModel) }
    
    puts "Save: #{collection} - #{attrs.inspect}"
    @tasks.call('StoreTasks', 'save', collection, attrs)
  end
end