Class: Architect4r::Model::Node

Inherits:
Object
  • Object
show all
Extended by:
Adapters::CarrierWave
Includes:
Callbacks, Connection, Persistency, Queries, Relationships
Defined in:
lib/architect4r/model/node.rb,
lib/architect4r/adapters/carrier_wave.rb

Direct Known Subclasses

GenericNode

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Adapters::CarrierWave

mount_uploader

Methods included from Relationships

#links

Methods included from Persistency

#create!, #destroyed?, #id, #new?, #persisted?, #save, #save!, #update_attributes

Methods included from Connection

#connection

Constructor Details

#initialize(properties = {}) ⇒ Node

Returns a new instance of Node.



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# File 'lib/architect4r/model/node.rb', line 48

def initialize(properties={})
  run_callbacks :initialize do
    parse_properties(properties)
  end
end

Instance Attribute Details

#raw_data ⇒ Object

Returns the value of attribute raw_data.



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# File 'lib/architect4r/model/node.rb', line 46

def raw_data
  @raw_data
end

Class Method Details

.inherited(subklass) ⇒ Object 



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# File 'lib/architect4r/model/node.rb', line 16

def self.inherited(subklass)
  super
  subklass.send(:include, ActiveModel::Conversion)
  subklass.extend ActiveModel::Naming
  subklass.send(:include, Architect4r::Model::Properties)
  subklass.send(:include, Architect4r::Model::Validations)
  
  subklass.class_exec do
    
    def self.model_root
      @model_root ||= begin
        # Check if there is already a model root,
        query = "start root = node(0) match root-[r:#{model_root_relation_type}]->x where r.architect4r_type and r.architect4r_type = '#{name}' return x"
        the_root = connection.cypher_query(query).to_a.first
        the_root &&= the_root['x']
        
        # otherwise create one
        the_root ||= begin 
          m_root = connection.create_node(:name => "#{name} Root", :root_for => name)
          connection.create_relationship(0, m_root, model_root_relation_type, { 'architect4r_type' => name })
          
          # Return model root node
          GenericNode.send(:build_from_database, m_root)
        end
      end
    end
    
  end
end

.model_root_relation_type ⇒ Object 



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# File 'lib/architect4r/model/node.rb', line 128

def self.model_root_relation_type
  'model_root'
end

Instance Method Details

#==(other) ⇒ Object Also known as: eql?

Override comparison of instances



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# File 'lib/architect4r/model/node.rb', line 69

def ==(other)
  other.is_a?(self.class) && id.present? && other.id == id
end

#create(options = {}) ⇒ Object

Create the document. Validation is enabled by default and will return false if the document is not valid. If all goes well, the document will be returned.



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# File 'lib/architect4r/model/node.rb', line 77

def create(options = {})
  run_callbacks :create do
    run_callbacks :save do
      # only create valid records
      return false unless perform_validations(options)
  
      # perform creation
      if result = connection.create_node(self._to_database_hash)
        self.raw_data = result
    
        # Link the node with a model root node
        connection.create_relationship(self.id, self.class.model_root.id, 'model_type')
      end
  
      # if something goes wrong we receive a nil value and return false
      !result.nil?
    end
  end
end

#destroy ⇒ Object 



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# File 'lib/architect4r/model/node.rb', line 118

def destroy
  run_callbacks :destroy do
    if result = connection.delete_node(self.id)
      @_destroyed = true
      self.freeze
    end
    result
  end
end

#hash ⇒ Object

Calculate hash manually in order to only include unique properties for comparison



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# File 'lib/architect4r/model/node.rb', line 63

def hash
  [self.class, self.id].hash
end

#to_s ⇒ Object

Override to_s to make debugging easier. It now includes the id and properties



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# File 'lib/architect4r/model/node.rb', line 56

def to_s
  prop_data = @properties_data.collect { |key, value| "#{key}='#{value}'" }.join(' ')
  "#<#{self.class.name}:#{object_id} id=#{id} #{prop_data} neo4j_uri='#{@raw_data['self']}'>"
end

#update(options = {}) ⇒ Object

Trigger the callbacks (before, after, around) only if the document isn’t new



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# File 'lib/architect4r/model/node.rb', line 99

def update(options = {})
  run_callbacks :update do
    run_callbacks :save do
      # Check if record can be updated
      raise "Cannot save a destroyed document!" if destroyed?
      raise "Calling #{self.class.name}#update on document that has not been created!" if new?
  
      # Check if we can continue
      return false unless perform_validations(options)
  
      # perform update
      result = connection.update_node(self.id, self._to_database_hash)
  
      # if something goes wrong we receive a nil value and return false
      !result.nil?
    end
  end
end