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# File 'lib/alchemy/upgrader/eight_one.rb', line 6
def migrate_page_metadata
desc "Migrating page metadata to page versions"
connection = ActiveRecord::Base.connection
pages_table = Alchemy::Page.table_name
versions_table = Alchemy::PageVersion.table_name
unmigrated_count = connection.select_value(<<-SQL.strip_heredoc).to_i
SELECT COUNT(*) FROM #{versions_table}
WHERE title IS NULL
AND meta_description IS NULL
AND meta_keywords IS NULL
SQL
if unmigrated_count == 0
log "All page versions have meta data.", :skip
return
end
sql = if connection.adapter_name.downcase.match?(/mysql|trilogy/)
<<-SQL.strip_heredoc
UPDATE #{versions_table} pv
INNER JOIN #{pages_table} p ON pv.page_id = p.id
SET pv.title = p.title,
pv.meta_description = p.meta_description,
pv.meta_keywords = p.meta_keywords
WHERE pv.title IS NULL
AND pv.meta_description IS NULL
AND pv.meta_keywords IS NULL
SQL
else
<<-SQL.strip_heredoc
UPDATE #{versions_table}
SET title = p.title,
meta_description = p.meta_description,
meta_keywords = p.meta_keywords
FROM #{pages_table} p
WHERE #{versions_table}.page_id = p.id
AND #{versions_table}.title IS NULL
AND #{versions_table}.meta_description IS NULL
AND #{versions_table}.meta_keywords IS NULL
SQL
end
migrated_count = connection.update(sql)
log "Migrated metadata for #{migrated_count} page versions."
end
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