你可以这样做:

Person.where("name = ? OR age = ?", 'Pearl', 24)

或者更优雅一点，安装rails_or gem并像这样做:

Person.where(:name => 'Pearl').or(:age => 24)

使用activerecord_any_of gem，您可以编写

Book.where.any_of(Book.where(:author => 'Poe'), Book.where(:author => 'Hemingway')

只要在条件中添加一个OR

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

我想添加这是一个解决方案搜索一个ActiveRecord的多个属性。自

.where(A: param[:A], B: param[:B])

会搜索A和B。

用服装

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%'))

MetaWhere插件非常棒。

轻松混合OR's和and 's，任何关联的连接条件，甚至指定OUTER join 's!

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