Ruby on Rails 3 howto make 'OR' condition

Question

I need an SQL statement that check if one condition is satisfied:

SELECT * FROM my_table WHERE my_table.x=1 OR my_table.y=1

I want to do th

Answer 1

Alternate syntax using Hash

Account.where("id = :val1 OR id = :val2", val1: 1, val2: 2).

This is particularly useful, when the value is compared with multiple columns. eg:

User.where("first_name = :name OR last_name = :name", name: 'tom')

Answer 2

I'd go with the IN clause, e.g:

Account.where(["id in (?)", [1, 2]])

Answer 3

This will works in Rails 5, see rails master :

Post.where('id = 1').or(Post.where('id = 2'))
# => SELECT * FROM posts WHERE (id = 1) OR (id = 2)

For Rails 3.0.4+:

accounts = Account.arel_table
Account.where(accounts[:id].eq(1).or(accounts[:id].eq(2)))

Answer 4

I've used the Squeel gem (https://github.com/ernie/squeel/) to do OR queries and it works beautifully.

It lets you write your query as Account.where{(id == 1) | (id == 2)}

Answer 5

You can define an Array as value in the :conditions Hash.

So you could do for example:

Account.all(:conditions => { :id => [1, 2] })

Tested with Rails 3.1.0

Answer 6

Account.where(id: [1,2]) no explanation needed.