ActiveRecord OR查询

Question

你如何在Rails 3 ActiveRecord中进行OR查询.我找到的所有示例都只有AND查询.

编辑:自Rails 5以来可以使用OR方法.请参阅ActiveRecord :: QueryMethods

Answer 1

如果要对一列的值使用OR运算符,可以将数组传递给.where,ActiveRecord将使用IN(value,other_value):

OR

输出:

Model.where(:column => ["value", "other_value"]

这应该相当于.where单个列

Answer 2

在Rails 3中,它应该是

Model.where("column = ? or other_column = ?", value, other_value)

这还包括原始sql但我不认为在ActiveRecord中有一种方法可以进行OR操作.你的问题不是一个菜鸟问题.

Answer 3

使用ARel

t = Post.arel_table

results = Post.where(
  t[:author].eq("Someone").
  or(t[:title].matches("%something%"))
)

结果SQL:

ree-1.8.7-2010.02 > puts Post.where(t[:author].eq("Someone").or(t[:title].matches("%something%"))).to_sql
SELECT     "posts".* FROM       "posts"  WHERE     (("posts"."author" = 'Someone' OR "posts"."title" LIKE '%something%'))

Answer 4

Rails/ActiveRecord的更新版本可以本机支持此语法.它看起来类似于:

Foo.where(foo: 'bar').or.where(bar: 'bar')

如此拉动请求中所述https://github.com/rails/rails/pull/9052

现在,只需坚持下面的工作:

Foo.where('foo= ? OR bar= ?', 'bar', 'bar')

更新:根据https://github.com/rails/rails/pull/16052,该or功能将在Rails 5中提供

更新:功能已合并到Rails 5分支

Answer 5

Rails最近将其添加到ActiveRecord中.它似乎在Rails 5中发布.已经致力于掌握:

https://github.com/rails/rails/commit/9e42cf019f2417473e7dcbfcb885709fa2709f89

Post.where(column: 'something').or(Post.where(other: 'else'))

# => SELECT * FROM posts WHERE (column = 'something') OR (other = 'else)

Answer 6

Rails 5附带了一种or方法.(墨迹到文档)

此方法接受一个ActiveRecord::Relation对象.例如:

User.where(first_name: 'James').or(User.where(last_name: 'Scott'))

Answer 7

如果要将数组用作参数,则以下代码适用于Rails 4:

query = Order.where(uuid: uuids, id: ids)
Order.where(query.where_values.map(&:to_sql).join(" OR "))
#=> Order Load (0.7ms)  SELECT "orders".* FROM "orders" WHERE ("orders"."uuid" IN ('5459eed8350e1b472bfee48375034103', '21313213jkads', '43ujrefdk2384us') OR "orders"."id" IN (2, 3, 4))

更多信息:在Rails 4中使用数组作为参数进行OR查询.

Answer 8

该MetaWhere插件完全是惊人的.

轻松混合OR和AND,在任何关联上加入条件,甚至指定OUTER JOIN!

Post.where({sharing_level: Post::Sharing[:everyone]} | ({sharing_level: Post::Sharing[:friends]} & {user: {followers: current_user} }).joins(:user.outer => :followers.outer}

Answer 9

只需在条件中添加OR即可

Model.find(:all, :conditions => ["column = ? OR other_column = ?",value, other_value])