-
-
Save claptimes5/5d764f04097140afaa9e to your computer and use it in GitHub Desktop.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| #http://stackoverflow.com/a/15413611/270511 | |
| module Unionable | |
| extend ActiveSupport::Concern | |
| module ClassMethods | |
| def union_scope(*scopes) | |
| id_column = "#{table_name}.id" | |
| if (sub_query = scopes.reject { |sc| sc.count == 0 }.map { |s| s.select(id_column).to_sql }.join(" UNION ")).present? | |
| where "#{id_column} IN (#{sub_query})" | |
| else | |
| none | |
| end | |
| end | |
| end | |
| end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Updated to use
ActiveSupport::Concern