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requires_one, allows you to require at least one of the specified attributes.

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This commit is contained in:
Dylan Egan 2011-06-28 15:26:27 -07:00
parent 442a507d43
commit dda35a0f99
2 changed files with 21 additions and 10 deletions
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3
lib/fog/compute/models/aws/volume.rb
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@ -38,7 +38,8 @@ module Fog
def save
raise Fog::Errors::Error.new('Resaving an existing object may create a duplicate') if identity
requires :availability_zone, :size
requires :availability_zone
requires_one :size, :snapshot_id
data = connection.create_volume(availability_zone, size, snapshot_id).body
new_attributes = data.reject {|key,value| key == 'requestId'}

28
lib/fog/core/attributes.rb
View file

@ -156,23 +156,33 @@ module Fog
# check that the attributes specified in args exist and is not nil
def requires(*args)
missing = missing_attributes(args)
if missing.length == 1
raise(ArgumentError, "#{missing.first} is required for this operation")
elsif missing.any?
raise(ArgumentError, "#{missing[0...-1].join(", ")} and #{missing[-1]} are required for this operation")
end
end
def requires_one(*args)
missing = missing_attributes(args)
if missing.length == args.length
raise(ArgumentError, "#{missing[0...-1].join(", ")} or #{missing[-1]} are required for this operation")
end
end
protected
def missing_attributes(args)
missing = []
for arg in [:connection] | args
unless send("#{arg}") || attributes.has_key?(arg)
missing << arg
end
end
unless missing.empty?
if missing.length == 1
raise(ArgumentError, "#{missing.first} is required for this operation")
else
raise(ArgumentError, "#{missing[0...-1].join(", ")} and #{missing[-1]} are required for this operation")
end
end
missing
end
protected
def dup_attributes!
@attributes = @attributes.dup
end