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module StripAttributes
# Strips whitespace from model fields and leaves nil values as nil.
# TODO: this differs from official StripAttributes, as it doesn't make blank cells null.
def strip_attributes!(options = nil)
before_validation do |record|
attribute_names = StripAttributes.narrow(record.attribute_names, options)
attribute_names.each do |attribute_name|
value = record[attribute_name]
if value.respond_to?(:strip)
stripped = value.strip
if stripped != value
record[attribute_name] = (value.nil?) ? nil : stripped
end
end
end
end
end
# Necessary because Rails has removed the narrowing of attributes using :only
# and :except on Base#attributes
def self.narrow(attribute_names, options)
if options.nil?
attribute_names
else
if except = options[:except]
except = Array(except).collect { |attribute| attribute.to_s }
attribute_names - except
elsif only = options[:only]
only = Array(only).collect { |attribute| attribute.to_s }
attribute_names & only
else
raise ArgumentError, "Options does not specify :except or :only (#{options.keys.inspect})"
end
end
end
end
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