Mirror rails default_sender logic

[jmschneider]

Update default_sender logic to mirror the Rails compute_default method.

The existing code uses instance_eval which always passes self in as the first argument. The examples in the Rails guides and API docs use lambdas with no arguments. With the existing Devise code this raises an ArgumentError exception since lambda expects no arguments and one is passed.

[jmschneider]

Are there any roadblocks for merging this? It would be nice if devise were compatible with the current rails docs.

[jmschneider]

Are there any roadblocks for merging this? It would be nice if devise were compatible with the current rails docs.

[dilshod]

we need this fix, experiencing the same issue. I'll have to create another mailer class as a workaround

[jmschneider]

@dilshod you may be able to use a proc instead of a lambda. I think that worked for us.

[dilshod]

@jmschneider yes, that works, thanks