How to send context specific values like name, prices and other invoice details about sendgrid-ruby

[mklemme]

Those are passed in the sendgrid smtp headers defined in X_mailer.rb as an array of strings. The format you define the placeholders in your email content should match the substitution tag's key. So ":name" wouldn't work if your headers had "%name%"

headers "X-SMTPAPI" => {
    "sub": {
      ":name" => [user.name],
      ":number" => [amount]
    }.to_json

# the 'to' email can be overridden per action
mail(
  from: '[email protected]',
  to: '[email protected]',
  subject: "Hello World"
)

source: http://stackoverflow.com/questions/32790963/rails-mailer-using-sendgrid-template/34169292#34169292

documentation: https://sendgrid.com/docs/API_Reference/SMTP_API/substitution_tags.html