mime types - Cannot add inline attachment with actionmailer in rails 3 -

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after bundle install no longer able add inline images attachments. error get:

nomethoderror (undefined method `type_for' mime::types:class):   app/mailers/welcome_mailer.rb:14:in `add_inline_attachment!'

so type_for method being called on class instead of object.

here how add inline attachment, follows guidelines actionmailer:

attachments.inline['photo.png'] = file.read('path/to/photo.png')

i have tested file indeed exists , gets read. issue appears gem-related.

upgrade mime-types 3.1, released on 22 may 2016. mime-types 2.x has 6 more planned updates , reaches end of life in november 2017, after point no more support provided @ all.


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