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digest_email_builder.rb
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digest_email_builder.rb
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class DigestEmailBuilder
include Callable
def initialize(content:, subscription:)
@content = content
@subscription = subscription
@subscriber = subscription.subscriber
@subscriber_list = subscription.subscriber_list
end
def call
Email.create!(
address: subscriber.address,
subject: I18n.t!(
"emails.digests.#{subscription.frequency}.subject",
title: subscriber_list.title,
),
body: body,
subscriber_id: subscriber.id,
)
end
private
attr_reader :content, :subscription, :subscriber_list, :subscriber
def body
<<~BODY
#{I18n.t("emails.digests.#{subscription.frequency}.opening_line")}
#{title_and_optional_url}
---
#{presented_results}
---
#{FooterPresenter.call(subscriber, subscription)}
BODY
end
def presented_results
changes = content.map do |item|
presenter = "#{item.class.name}Presenter".constantize
presenter.call(item, subscription)
end
changes.join("\n\n---\n\n").strip
end
def title_and_optional_url
result = "# #{subscriber_list.title}"
source_url = SourceUrlPresenter.call(
subscriber_list.url,
utm_source: subscriber_list.slug,
utm_content: subscription.frequency,
)
result += "\n\n#{source_url}" if source_url
result
end
end