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require 'active_support/descendants_tracker'
module ActionMailer
module Previews #:nodoc:
extend ActiveSupport::Concern
included do
# Set the location of mailer previews through app configuration:
#
# config.action_mailer.preview_path = "#{Rails.root}/lib/mailer_previews"
#
class_attribute :preview_path, instance_writer: false
end
end
class Preview
extend ActiveSupport::DescendantsTracker
class << self
# Returns all mailer preview classes
def all
load_previews if descendants.empty?
descendants
end
# Returns the mail object for the given email name
def call(email)
preview = self.new
preview.public_send(email)
end
# Returns all of the available email previews
def emails
public_instance_methods(false).map(&:to_s).sort
end
# Returns true if the email exists
def email_exists?(email)
emails.include?(email)
end
# Returns true if the preview exists
def exists?(preview)
all.any?{ |p| p.preview_name == preview }
end
# Find a mailer preview by its underscored class name
def find(preview)
all.find{ |p| p.preview_name == preview }
end
# Returns the underscored name of the mailer preview without the suffix
def preview_name
name.sub(/Preview$/, '').underscore
end
protected
def load_previews #:nodoc:
Dir["#{preview_path}/**/*_preview.rb"].each{ |file| require_dependency file }
end
def preview_path #:nodoc:
Base.preview_path
end
end
end
end
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