Question

您好我希望将此sql转换为rails active record

select a.*
from public.users a
inner join public.user_by_groups gp2 on gp2.user_id = a.id and gp2.active = 'true'
and gp2.group_id in 
(SELECT gp.group_id                     
  FROM public.users u
  inner join public.user_by_groups gp on gp.user_id = u.id and gp.active = 'true'
  where u.id = '4')

我的模型（与多对多关系）

class User < ActiveRecord::Base
  has_many :user_by_groups
  has_many :groups, through: :user_by_groups
end

class UserByGroup < ApplicationRecord
  # Relations
  belongs_to :user
  belongs_to :group
end

class Group < ApplicationRecord
  has_many :user_by_groups
  has_many :users, through: :user_by_groups
end

单身就有了第一个问题：

    @class_mates = User.joins(:user_by_groups)
.where(user_by_groups: { user_id: 4 })
.where(user_by_groups: { active: true })

Answer 1

试试这个：

textView.setText(R.string.html); // this will properly format the text
textView.setText(getText(R.string.html)); // this will properly format the text
textView.setText(getString(R.string.html)); // this will ignore the formatting tags

如何在Rails 5

1 个答案: