Question

I want to have a where clause with an equal and does not equal condition:

@user = User.where(:user_id => current_user.id, :author_id != current_user.id).nil? ? (render :something) : (render :somethingelse)

The above does not work:

syntax error, unexpected ‘)’,
expecting tASSOC …d, :user_id !=
current_user.id).nil? ? (render
:index) : (re…

If I change the second condition from != to => it will work, however.

How do I have both conditions in one where clase? Thank you

Answer 1

Here’s how you would use Arel to generate the query “select * from users where user_id = ? and author_id != ?“:

users = User.arel_table
User.where(users[:user_id].      eq(current_user.id).and(
           users[:author_id].not_eq(current_user.id)))

Using Arel isn’t as concise as using Hash conditions for simple conditions, but it’s a lot more powerful!

Here’s a link to the full list of predications (eq, not_eq, gt, lt, etc.) available with Arel.