method

set_content_type

v7.1.3.4 - Show latest stable - Class: ActionMailer::Base

set_content_type(m, user_content_type, class_default)

private

Used by #mail to set the content type of the message.

It will use the given user_content_type, or multipart if the mail message has any attachments. If the attachments are inline, the content type will be “multipart/related”, otherwise “multipart/mixed”.

If there is no content type passed in via headers, and there are no attachments, or the message is multipart, then the default content type is used.

# File actionmailer/lib/action_mailer/base.rb, line 915
      def set_content_type(m, user_content_type, class_default) # :doc:
        params = m.content_type_parameters || {}
        case
        when user_content_type.present?
          user_content_type
        when m.has_attachments?
          if m.attachments.all?(&:inline?)
            ["multipart", "related", params]
          else
            ["multipart", "mixed", params]
          end
        when m.multipart?
          ["multipart", "alternative", params]
        else
          m.content_type || class_default
        end
      end

set_content_type

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