discourse/db/migrate/20180710172959_disallow_mul...

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# frozen_string_literal: true
class DisallowMultiLevelsThemeComponents < ActiveRecord::Migration[5.2]
def up
@handled = []
top_parents = DB.query("
SELECT parent_theme_id, child_theme_id
FROM child_themes
WHERE parent_theme_id NOT IN (SELECT child_theme_id FROM child_themes)
")
top_parents.each do |top_parent|
migrate_child(top_parent, top_parent)
end
if @handled.size > 0
execute("
DELETE FROM child_themes
WHERE parent_theme_id NOT IN (#{top_parents.map(&:parent_theme_id).join(", ")})
")
end
execute("
UPDATE themes
SET user_selectable = false
FROM child_themes
WHERE themes.id = child_themes.child_theme_id
AND themes.user_selectable = true
")
default = DB.query_single("SELECT value FROM site_settings WHERE name = 'default_theme_id'").first
if default
default_child = DB.query("SELECT 1 AS one FROM child_themes WHERE child_theme_id = ?", default.to_i).present?
execute("DELETE FROM site_settings WHERE name = 'default_theme_id'") if default_child
end
end
def down
raise ActiveRecord::IrreversibleMigration
end
private
def migrate_child(parent, top_parent)
unless already_exists?(top_parent.parent_theme_id, parent.child_theme_id)
execute("
INSERT INTO child_themes (parent_theme_id, child_theme_id, created_at, updated_at)
VALUES (#{top_parent.parent_theme_id}, #{parent.child_theme_id}, now(), now())
")
end
@handled << [top_parent.parent_theme_id, parent.parent_theme_id, parent.child_theme_id]
children = DB.query("
SELECT parent_theme_id, child_theme_id
FROM child_themes
WHERE parent_theme_id = :child", child: parent.child_theme_id
)
children.each do |child|
unless @handled.include?([top_parent.parent_theme_id, child.parent_theme_id, child.child_theme_id])
migrate_child(child, top_parent)
end
end
end
def already_exists?(parent, child)
DB.query("SELECT 1 AS one FROM child_themes WHERE child_theme_id = :child AND parent_theme_id = :parent", child: child, parent: parent).present?
end
end