module GraphQL::BackwardsCompatibility
Helpers for migrating in a backwards-compatibile way @api private
Public Instance Methods
get_arity(callable)
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# File lib/graphql/backwards_compatibility.rb, line 32 def get_arity(callable) case callable when Method, Proc callable.arity else callable.method(:call).arity end end
wrap_arity(callable, from:, to:, name:, last: false)
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Given a callable whose API used to take `from` arguments, check its arity, and if needed, apply a wrapper so that it can be called with `to` arguments. If a wrapper is applied, warn the application with `name`.
If `last`, then use the last arguments to call the function.
# File lib/graphql/backwards_compatibility.rb, line 13 def wrap_arity(callable, from:, to:, name:, last: false) arity = get_arity(callable) if arity == to || arity < 0 # It already matches, return it as is callable elsif arity == from # It has the old arity, so wrap it with an arity converter message ="#{name} with #{from} arguments is deprecated, it now accepts #{to} arguments, see:" backtrace = caller(0, 20) # Find the first line in the trace that isn't library internals: user_line = backtrace.find {|l| l !~ /lib\/graphql/ } warn(message + "\n" + user_line + "\n") wrapper = last ? LastArgumentsWrapper : FirstArgumentsWrapper wrapper.new(callable, from) else raise "Can't wrap #{callable} (arity: #{arity}) to have arity #{to}" end end