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# frozen_string_literal: true
class PolymorphicMentions < ActiveRecord::Migration[4.2]
def change
remove_index :mentions, column: %i(post_id)
remove_index :mentions, column: %i(person_id post_id), unique: true
rename_column :mentions, :post_id, :mentions_container_id
add_column :mentions, :mentions_container_type, :string
add_index :mentions,
%i(mentions_container_id mentions_container_type),
name: "index_mentions_on_mc_id_and_mc_type",
length: {mentions_container_type: 191}
add_index :mentions,
%i(person_id mentions_container_id mentions_container_type),
name: "index_mentions_on_person_and_mc_id_and_mc_type",
length: {mentions_container_type: 191},
unique: true
reversible(&method(:up_down))
end
class Mention < ApplicationRecord
end
class Notification < ApplicationRecord
end
def up_down(change)
change.up do
Mention.update_all(mentions_container_type: "Post")
change_column :mentions, :mentions_container_type, :string, null: false
Notification.where(type: "Notifications::Mentioned").update_all(type: "Notifications::MentionedInPost")
end
change.down do
Notification.where(type: "Notifications::MentionedInPost").update_all(type: "Notifications::Mentioned")
Mention.where(mentions_container_type: "Comment").destroy_all
Notification.where(type: "Notifications::MentionedInComment").destroy_all
end
end
end
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