engine/app/models/asset_field.rb

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class AssetField
include Mongoid::Document
include Mongoid::Timestamps
## fields ##
field :label, :type => String
field :_alias, :type => String # need it for instance in: > asset.description (description being a custom field)
field :_name, :type => String
field :kind, :type => String
field :position, :type => Integer, :default => 0
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## validations ##
validates_presence_of :label, :kind
embedded_in :asset_collection, :inverse_of => :asset_fields
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## methods ##
def field_type
case self.kind
when 'String', 'Text', 'Email' then String
else
self.kind.constantize
end
end
def apply(object, association_name)
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# puts "applying...#{self._name} / #{self._alias}"
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object.class.send(:set_field, self._name, { :type => self.field_type })
object.class_eval <<-EOF
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alias :#{self.safe_alias} :#{self._name}
alias :#{self.safe_alias}= :#{self._name}=
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EOF
end
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def safe_alias
self.set_alias
self._alias
end
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protected
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def set_unique_name!
self._name = "custom_field_#{self.increment_counter!}"
end
def set_alias
return if self.label.blank? && self._alias.blank?
self._alias ||= self.label.clone
self._alias.slugify!(:downcase => true, :underscore => true)
end
def increment_counter!
next_value = (self._parent.send(:"#{self.association_name}_counter") || 0) + 1
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self._parent.send(:"#{self.association_name}_counter=", next_value)
next_value
end
def siblings
self._parent.associations[self.association_name]
end
end