set custom message when using proc to validate value

[blainejohnson17]

How can I use a proc to validate and use a custom message?

This way is deprecated:

params do
  requires :e, values: { proc: -> (v) { v.even? }, message: 'must be even' }
end

The new way doesn't support a custom message:

params do
  requires :e, values: -> (v) { v.even? }
end

[dblock]

I don't believe it's possible. Would be a good feature to add.

[blainejohnson17]

@dblock , what do you think about enhancing the values[:value] to allow proc with arity 1 to support this use case?

params do
  requires :e, values: { value: -> (v) { v.even? }, message: 'must be even' }
end

[dblock]

I like it. Give the code a try?

[blainejohnson17]

sure, I'll give it a go.

[TheDevJoao]

Turns out my PR description didn't close this automatically after the merge, @dblock could you close this for us?