CODEWITHSUNDEEP
ruby-on-railsherokuactionmailer
tks
tks

Reputation: 753

NoMethodError: undefined method 'index' when calling deliver on rails 3.1 mailer

I have set up a staging instance of a rails 3.1 application on Heroku and everything seems to work fine except I'm getting a strange error when I try to send emails. I am using the sendgrid starter addon for email delivery. The full error is below:

NoMethodError: undefined method `index' for #<Mail::Message:0x000000048daf28>
    /app/.bundle/gems/ruby/1.9.1/gems/mail-2.3.0/lib/mail/message.rb:1289:in `method_missing'
    /app/.bundle/gems/ruby/1.9.1/gems/mail-2.3.0/lib/mail/encodings.rb:117:in `value_decode'
    /app/.bundle/gems/ruby/1.9.1/gems/mail-2.3.0/lib/mail/encodings.rb:101:in `decode_encode'
    /app/.bundle/gems/ruby/1.9.1/gems/mail-2.3.0/lib/mail/fields/unstructured_field.rb:74:in `do_decode'

if I just generate the message object without calling deliver on it and inspect it everything seems fine. I am not seeing this error on my production app. Can you tell me what this error means and how to resolve it? Thanks.

Upvotes: 4

Views: 2623

Answers (5)

nfriend21
nfriend21

Reputation: 2200

I had a similar problem. However, the error I received was:

NoMethodError (undefined method `ascii_only?' for nil:NilClass)

My problem was I had:

mail(to: emails,....)

And my variable "emails" was actually an array, instead of being one single string of emails.

Upvotes: 0

HannesBenson
HannesBenson

Reputation: 842

This error happened because I was setting custom headers to an integer value. Using to_s on these values resolved the issue for me.

Upvotes: 0

tks
tks

Reputation: 753

This error was the result of using Class instead of Module when defining a mail helper I'd created.

Upvotes: 1

Mario Uher
Mario Uher

Reputation: 12397

Got the same error on my local machine using Rails 3.0.11. It happened after I passed some object instead of a string to the mail :to attribute. So be sure that the :to attribute is a string!

mail(to: object.to_s)

Upvotes: 11

Ryan Bigg
Ryan Bigg

Reputation: 107728

A new version of Mail, Mail 2.4.0, was released this weekend. I would recommend upgrading to this latest version and seeing if that has fixed your issue.

Upvotes: 1

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