Class: PPT::Presenters::Attribute

Inherits:
Object
  • Object
show all
Defined in:
lib/simple-orm/presenters.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name) ⇒ Attribute

Returns a new instance of Attribute.



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# File 'lib/simple-orm/presenters.rb', line 24

def initialize(name)
  @name = name
  @validators, @hooks = Array.new, Hash.new
end

Instance Attribute Details

#instance ⇒ Object

Returns the value of attribute instance.



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# File 'lib/simple-orm/presenters.rb', line 22

def instance
  @instance
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/simple-orm/presenters.rb', line 23

def name
  @name
end

Instance Method Details

#default(value = nil, &block) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 53

def default(value = nil, &block)
  @hooks[:default] = value ? Proc.new { value } : block
  self
end

#get(stage = nil) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 85

def get(stage = nil)
  if stage.nil?
    @value ||= self.run_hook(:default)
  elsif stage == :create
    @value ||= self.run_hook(:on_create)
  elsif stage == :update
    @value ||= self.run_hook(:on_update)
  else
    raise ArgumentError.new("Attribute#get takes an optional argument which can be either :create or :update.")
  end
end

#on_create(value = nil, &block) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 58

def on_create(value = nil, &block)
  @hooks[:on_create] = value ? Proc.new { value } : block
  self
end

#on_update(value = nil, &block) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 63

def on_update(value = nil, &block)
  @hooks[:on_update] = value ? Proc.new { value } : block
  self
end

#private ⇒ Object

DSL



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# File 'lib/simple-orm/presenters.rb', line 30

def private
  @private = true
  self
end

#private? ⇒ Boolean

API

Returns:

  • (Boolean) 


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# File 'lib/simple-orm/presenters.rb', line 69

def private?
  @private
end

#required ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 35

def required
  @validators << Validator.new('is required') do |value|
    value != nil && ! value.empty?
  end

  self
end

#run_hook(name) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 73

def run_hook(name)
  @hooks[name] && @instance.instance_eval(&@hooks[name])
end

#set(value) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 77

def set(value)
  if self.private?
    raise "Attribute #{@name} is private!"
  end

  @value = value
end

#type(type) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 48

def type(type)
  @type = type
  self
end

#validate(message, &block) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 43

def validate(message, &block)
  self.validators << Validator.new(message, &block)
  self
end

#validate!(stage = nil) ⇒ Object 



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# File 'lib/simple-orm/presenters.rb', line 97

def validate!(stage = nil)
  @validators.each do |validator|
    validator.validate!(self.name, self.get(stage))
  end
end