52 lines
1.4 KiB
Ruby
52 lines
1.4 KiB
Ruby
module ActiveModel
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# == Active Model Conversions
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#
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# Handles default conversions: to_model, to_key and to_param.
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#
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# == Example
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#
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# Let's take for example this non persisted object.
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#
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# class ContactMessage
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# include ActiveModel::Conversion
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#
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# # ContactMessage are never persisted in the DB
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# def persisted?
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# false
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# end
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# end
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#
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# cm = ContactMessage.new
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# cm.to_model == self # => true
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# cm.to_key # => nil
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# cm.to_param # => nil
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#
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module Conversion
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# If your object is already designed to implement all of the Active Model
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# you can use the default to_model implementation, which simply returns
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# self.
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#
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# If your model does not act like an Active Model object, then you should
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# define <tt>:to_model</tt> yourself returning a proxy object that wraps
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# your object with Active Model compliant methods.
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def to_model
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self
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end
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# Returns an Enumerable of all key attributes if any is set, regardless
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# if the object is persisted or not.
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#
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# Note the default implementation uses persisted? just because all objects
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# in Ruby 1.8.x responds to :id.
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def to_key
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persisted? ? [id] : nil
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end
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# Returns a string representing the object's key suitable for use in URLs,
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# or nil if persisted? is false
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def to_param
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persisted? ? to_key.join('-') : nil
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end
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end
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end
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