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require 'erb'
require 'yaml'
module ActiveRecord
class Fixtures
class File # :nodoc:
include Enumerable
##
# Open a fixture file named +file+. When called with a block, the block
# is called with the filehandle and the filehandle is automatically closed
# when the block finishes.
def self.open(file)
x = new file
block_given? ? yield(x) : x
end
def initialize(file)
@file = file
@rows = nil
end
def each(&block)
rows.each(&block)
end
RESCUE_ERRORS = [ ArgumentError, Psych::SyntaxError ] # :nodoc:
private
def rows
return @rows if @rows
begin
data = YAML.load(render(IO.read(@file)))
rescue *RESCUE_ERRORS => error
raise Fixture::FormatError, "a YAML error occurred parsing #{@file}. Please note that YAML must be consistently indented using spaces. Tabs are not allowed. Please have a look at http://www.yaml.org/faq.html\nThe exact error was:\n #{error.class}: #{error}", error.backtrace
end
@rows = data ? validate(data).to_a : []
end
def render(content)
ERB.new(content).result
end
# Validate our unmarshalled data.
def validate(data)
unless Hash === data || YAML::Omap === data
raise Fixture::FormatError, 'fixture is not a hash'
end
raise Fixture::FormatError unless data.all? { |name, row| Hash === row }
data
end
end
end
end
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