使用ActiveRecord的User.where（：id =＆gt; 1）.where（：id =＆gt; 2）不起作用

Question

简单地说：

pry(main)> User.where(:id =>1).where(:id => 2).first
 User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 2 LIMIT 1
 #user 2 is returned

如何让它运行：

pry(main)> User.where(:id =>1).where(:id => 2).first
 User Load (0.4ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 AND "users"."id" = 2 LIMIT 1
#this way no user is returned, because I'm narrowing it down as much as possible

Answer 1

在arel的帮助下，你可以这样做：

t = User.arel_table
User.where(t[:id].eq("1").and(t[:id].eq("2")))