加入 2 个不同的表，其中 user_id 等于 2 个日期之间 created_at

Question

在我的应用程序中，我有 3 个模型 User、Visit、Post。我想要实现的是选择属于 user 的 visits & posts，其中 created_at 在 2 个日期和 group 之间 day （我在 group_by_day 上使用 groupdate） 和 return count 在 visits & posts 那一天。

我试过几次都没有成功：

User.joins(:visits,:posts).where("visits.user_id = ?, posts.user_id = ?", current_user.id, current_user.id)
    .where("visits.created_at >= ? AND visits.created_at <= ?", 15.days.ago.midnight.in_time_zone("Berlin"), 2.days.ago.midnight.in_time_zone("Berlin"))
    .where("posts.created_at >= ? AND posts.created_at <= ?", 15.days.ago.midnight.in_time_zone("Berlin"), 2.days.ago.midnight.in_time_zone("Berlin"))
    .group_by_day(:created_at, range: 15.days.ago.midnight.in_time_zone("Berlin")..Time.now.in_time_zone("Berlin"), format: "%d %b")
    .count

这给了我：ActiveRecord::StatementInvalid

SQLite3::SQLException: row value misused: SELECT COUNT(*) AS count_all, strftime('%Y-%m-%d 00:00:00 UTC', "users"."created_at") AS strftime_y_m_d_00_00_00_utc_users_created_at FROM "users" INNER JOIN "visits" ON "visits"."user_id" = "users"."id" INNER JOIN "posts" ON "posts"."user_id" = "users"."id" WHERE (visits.user_id = 1, posts.user_id = 1) AND (visits.created_at >= '2020-01-20 00:00:00' AND visits.created_at <= '2020-02-02 00:00:00') AND (posts.created_at >= '2020-01-20 00:00:00' AND posts.created_at <= '2020-02-02 00:00:00') AND ("users"."created_at" >= '2020-01-20 00:00:00' AND "users"."created_at" <= '2020-02-04 19:03:28.383850') GROUP BY strftime('%Y-%m-%d 00:00:00 UTC', "users"."created_at")

我的模特：

class Visit < ApplicationRecord
  belongs_to :user
end

class Post < ApplicationRecord
    belongs_to :user
end

class User < ApplicationRecord
  has_many :visits
  has_many :posts
end

我一直在四处寻找并尝试了几种不同的方法，但都没有成功。非常感谢任何 rails 帮助 plain sql 或提示，并提前致谢！

Answer 1

试试这个：

_start_time = 15.days.ago.midnight.in_time_zone("Berlin") ## get start time
_end_time = 2.days.ago.midnight.in_time_zone("Berlin") ## get end time

 #### query ###
User.joins(:visits, :posts).where(visits: { created_at: (_start_time.._end_time) }).where(posts: { created_at: (_start_time.._end_time) }).group_by_day(:created_at, range: _start_time..Time.now.in_time_zone("Berlin"), format: "%d %b").count

加入 2 个不同的表，其中 user_id 等于 2 个日期之间 created_at

Joining 2 different tables where user_id equals to and created_at between 2 dates

sql

activerecord

ruby-on-rails-5.2