我有这个模特
点 - ＆gt; belongs_to：days
天 - ＆gt; belongs_to：routes
我希望按点:address分组一种路线，我可以得到所有这些：
Point.includes(:day => :route).where(days:{routes:{place: "Dublin"}})
但如果我尝试使用group(:address)，我会发现此错误：
ActiveRecord::StatementInvalid: PG::GroupingError: ERROR: column
"points.id" must appear in the GROUP BY clause or be used in an
aggregate function
LINE 1: SELECT "points"."id" AS t0_r0, "points"."title" AS t0_r1,
"...