Class: YAML_Model

Inherits:
Object
  • Object
show all
Defined in:
lib/yaml-model.rb,
lib/yaml-model/version.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
"1.3.2"
@@volatile = 
[ :@volatile ]

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ YAML_Model

Returns a new instance of YAML_Model.



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# File 'lib/yaml-model.rb', line 65

def initialize
  self.class.attributes.keys.each do |attribute|
    instance_eval( "@#{attribute} ||= self.class.__#{attribute}__default" )
    instance_eval( "__#{attribute}__assert_type" )
  end
end

Instance Attribute Details

#id ⇒ Object (readonly)

Returns the value of attribute id.



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# File 'lib/yaml-model.rb', line 31

def id
  @id
end

Class Method Details

.[](id) ⇒ Object 



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# File 'lib/yaml-model.rb', line 89

def self.[]( id )
  all.select{|n|n.id==id}.first
end

.all ⇒ Object 



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# File 'lib/yaml-model.rb', line 35

def self.all
  @@database[ :data ][ self.name ] ||= []
end

.assert(assertion, info) ⇒ Object

Raises:



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# File 'lib/yaml-model.rb', line 39

def self.assert( assertion, info )
  raise Error.new( info.inspect ) unless assertion
end

.assert_type(variable, types) ⇒ Object 



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# File 'lib/yaml-model.rb', line 43

def self.assert_type( variable, types )
  assert( [types].flatten.inject(false){|result,type|result||=(type===variable)}, "Invalid type: `#{variable.class.name}` for `#{self.name}::#{variable}` should be of: #{types.inspect}" )
end

.create(*args) ⇒ Object 



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# File 'lib/yaml-model.rb', line 138

def self.create( *args )
  this = self.new( *args )
  this.instance_eval do
    @id = @@database[ :next_oid ]
    @id.freeze
  end
  @@database[ :next_oid ] += 1
  @@database[ :data ][ this.class.name ] ||= []
  @@database[ :data ][ this.class.name ] << this
  this
end

.each(&block) ⇒ Object 



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# File 'lib/yaml-model.rb', line 114

def self.each &block
  all.each &block
end

.filename=(filename) ⇒ Object 



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# File 'lib/yaml-model.rb', line 97

def self.filename=( filename )
  @@database_filename = filename
  self.load!
end

.filter(hash) ⇒ Object 



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# File 'lib/yaml-model.rb', line 122

def self.filter hash
  select do |this|
    hash.keys.inject( true ) do |result,variable|
      this.instance_eval( "@#{variable}" ) == hash[ variable ]
    end
  end
end

.has(that_attribute_plural, that_class, opts = {}) ⇒ Object 



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# File 'lib/yaml-model.rb', line 166

def self.has( that_attribute_plural, that_class, opts = {} )
  options = {
    :many_to_many => false
  }.merge( opts )
  if options[ :many_to_many ]
    this_class = self
    this_class_name, that_class_name = [this_class,that_class].map{|n|n.name.split(':')[-1]}
    this_attribute_singular = this_class_name.downcase.to_sym
    that_attribute_singular = that_class_name.downcase.to_sym
    via_class_name = [ this_class_name, that_class_name ].sort.map{|n|n.capitalize}.join('')
    via_class = eval( "#{via_class_name}||=Class.new(YAML_Model) do
type :#{this_attribute_singular}, #{this_class}
type :#{that_attribute_singular}, #{that_class}
init #{[this_attribute_singular,that_attribute_singular].sort.map{|n|":#{n}"}.join(',')}
end" )
    via_attribute_plural = ( via_class_name.downcase + "s" ).to_sym

    this_class.has via_attribute_plural, via_class

    define_method that_attribute_plural do
      send( via_attribute_plural ).map do |via_instance|
        via_instance.send( that_attribute_singular )
      end
    end

    define_method "add_#{that_attribute_singular}".to_sym do |that_instance|
      via_instance = ( ( this_attribute_singular < that_attribute_singular ) ? via_class.create( self, that_instance ) : via_class.create( that_instance, self ) )
      via_instance.send( "#{this_attribute_singular}=".to_sym, self )
      via_instance.send( "#{that_attribute_singular}=".to_sym, that_instance )
    end

    define_method "remove_#{that_attribute_singular}".to_sym do |that_instance|
      via_instance = via_class.select{|n| n.send(this_attribute_singular).id == self.id && n.send(that_attribute_singular).id == that_instance.id }.first
      via_instance.send( :delete )
    end

  else

    define_method that_attribute_plural do
      that_class.select do |that_instance|
        if options[ that_class ]
          that_instance.instance_eval( options[ that_class ].to_s ).id == self.id
        else
          that_instance.instance_variables.inject( false ) do |result,variable|
            result ||= that_instance.instance_eval(variable.to_s).class == self.class && that_instance.instance_eval(variable.to_s).id == self.id
          end
        end
      end
    end

  end
end

.inherited(child) ⇒ Object 



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# File 'lib/yaml-model.rb', line 6

def self.inherited( child )
  child.instance_eval('@__attributes = {}')
  child.define_singleton_method( :attributes ) do
    @__attributes
  end
end

.init(*attributes, &block) ⇒ Object 



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# File 'lib/yaml-model.rb', line 72

def self.init *attributes, &block
  define_method :initialize do |*args|
    raise ArgumentError.new( "wrong number of arguments (#{args.size} for #{attributes.size}" ) unless args.size == attributes.size

    attributes.each do |attribute|
      value = args.shift
      self.send( "#{attribute}=".to_sym, value )
    end

    # FIXME For some reason commands within this block to set attribute values
    # require the `self.` prefix or they just don't work
    self.instance_eval( &block ) if block_given?

    super()
  end
end

.load! ⇒ Object 



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# File 'lib/yaml-model.rb', line 93

def self.load!
  @@database = YAML.load( File.read( @@database_filename.to_s ) ) if File.exists?( @@database_filename.to_s )
end

.next_oid ⇒ Object 



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# File 'lib/yaml-model.rb', line 25

def self.next_oid
  @@database[ :next_oid ]
end

.reset! ⇒ Object 



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# File 'lib/yaml-model.rb', line 16

def self.reset!
  @@database_filename = nil

  @@database = {
    :next_oid => 1,
    :data => {}
  }
end

.save! ⇒ Object 



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# File 'lib/yaml-model.rb', line 106

def self.save!
  if @@database_filename
    File.open( @@database_filename, 'w' ) do |file|
      file.write( self.to_yaml )
    end
  end
end

.select(&block) ⇒ Object 



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# File 'lib/yaml-model.rb', line 118

def self.select &block
  all.select &block
end

.sort_by(*attributes) ⇒ Object 



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# File 'lib/yaml-model.rb', line 158

def self.sort_by( *attributes )
  define_method '<=>'.to_sym do |other|
    attributes.map{|a|self.send(a)} <=> attributes.map{|a|other.send(a)}
  end
end

.to_yaml ⇒ Object 



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# File 'lib/yaml-model.rb', line 102

def self.to_yaml
  @@database.to_yaml
end

.type(attr, types, options = {}, &block) ⇒ Object 



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# File 'lib/yaml-model.rb', line 47

def self.type attr, types, options = {}, &block
  @__attributes[ attr ] = [ types, options ]
  define_method attr do
    instance_eval "@#{attr}"
  end
  define_method "#{attr}=".to_sym do |value|
    YAML_Model.assert_type value, types
    instance_exec( value, &block ) if block_given?
    instance_eval "@#{attr} = value"
  end
  define_singleton_method "__#{attr}__default".to_sym do
    options[ :default ]
  end
  define_method "__#{attr}__assert_type" do
    YAML_Model.assert_type( instance_eval( "@#{attr}" ), types )
  end
end

.volatile(variable) ⇒ Object 



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# File 'lib/yaml-model.rb', line 130

def self.volatile variable
  @@volatile << "@#{variable}".to_sym
end

Instance Method Details

#delete ⇒ Object 



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# File 'lib/yaml-model.rb', line 150

def delete
  @@database[ :data ][ self.class.name ].delete( self )
end

#to_s ⇒ Object 



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# File 'lib/yaml-model.rb', line 154

def to_s
  "#{self.class.name}[#{id}]"
end

#to_yaml_properties ⇒ Object 



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# File 'lib/yaml-model.rb', line 134

def to_yaml_properties
  instance_variables - @@volatile
end