只是出于好奇,有没有人知道使用命名范围(而不是 find_by_sql)构建以下集合的更好方法?
@available = Workflow.find_by_sql(["
SELECT workflows.id FROM workflows
WHERE workflows.project_id = ? AND workflows.status < 5 AND
( workflows.created_by = ? OR workflows.id IN
(
SELECT workflow_id FROM workflow_histories
INNER JOIN workflow_recipients on workflow_histories.id = workflow_recipients.workflow_history_id
WHERE workflow_recipients.recipient_id = ? AND workflow_recipients.recipient_type = ?
)
)", project.id, @current_user.id, @current_user.id , 'USER'])