Rails查询，基于不相关模型的范围

Question

我想找到一个用户的所有的convos那里是不是connect

我有一个convos表，带有sender_id和recipient_id，这两个都是对用户ID的引用

# app/models/user.rb

has_many :convos, ->(user) {
  unscope(:where).where("sender_id = :id OR recipient_id = :id", id: user.id)
}

请注意，convo可以属于sender_id或receive_id的用户。

# app/models/convo.rb

class Convo < ApplicationRecord
  belongs_to :sender, :foreign_key => :sender_id, class_name: 'User'
  belongs_to :recipient, :foreign_key => :recipient_id, class_name: 'User'

  has_many :msgs, dependent: :destroy

  validates_uniqueness_of :sender_id, :scope => :recipient_id

  scope :involving, -> (user) do
    where("convos.sender_id =? OR convos.recipient_id =?",user.id,user.id)
  end

  scope :between, -> (sender_id,recipient_id) do
    where("(convos.sender_id = ? AND convos.recipient_id =?) OR (convos.sender_id = ? AND convos.recipient_id =?)", sender_id,recipient_id, recipient_id, sender_id)
  end
end

Connect表中有requestor_id和requestee_id都是对用户ID的引用。连接模型

class Connect < ApplicationRecord
  belongs_to :requestor, :foreign_key => :requestor_id, class_name: 'User'
  belongs_to :requestee, :foreign_key => :requestee_id, class_name: 'User'


  scope :between, -> (requestor_id,requestee_id) do
    where("(connects.requestor_id = ? AND connects.requestee_id =?) OR (connects.requestor_id = ? AND connects.requestee_id =?)", requestor_id,requestee_id, requestee_id, requestor_id)
  end
end

我想找到一个用户的所有的convos那里是不是connect

我已经尝试过类似的东西：

user = User.first
user.convos.where.not(Connect.between(self.requestor_id, self.requestee_id).length > 0 )

# NoMethodError (undefined method `requestor_id' for main:Object)

---

user.convos.where.not(Connect.between(convo.requestor_id, convo.requestee_id).length > 0 )

# undefined local variable or method `convo' for main:Object

---

然后，我尝试完全不引用用户，而只是尝试在没有连接的情况下获得所有convo。

Convo.where("Connect.between(? ,?) < ?)", :sender_id, :recipient_id, 1)

# ActiveRecord::StatementInvalid (SQLite3::SQLException: near "between": syntax error: SELECT "convos".* FROM "convos" WHERE (Connect.between('sender_id' ,'recipient_id') < 1)))

---

Convo.where("Connect.between(? ,?) < ?)", self.sender_id, self.recipient_id, 1)

# NoMethodError (undefined method `sender_id' for main:Object)

---

在不存在连接的情况下获取所有用户需求的最佳方法是什么？

更新

这是可行的，而且是我要寻找的东西，但是显然这很浪费，我想了解如何在一次通话中获得此功能。

@og_connections = []
current_user.convos.each do |convo|
   if Connect.between(convo.sender_id, convo.recipient_id).length === 0
     @og_connections.push(current_user.id === convo.sender_id ? convo.recipient_id : convo.sender_id)
   end
end
@connections = User.select(:id, :first_name, :slug).where(id: @og_connections, status: 'Active')