Implement update_all

[khiav223577]

update_all (expected_number, updates)

Behaves like ActiveRecord::Relation#update_all but add an additional constrain that the number of affected rows equals to what you specify.

Parameters

• expected_number - The number of rows that you expect to be updated.
• updates - A string, array, or hash representing the SET part of an SQL statement.

Examples

User.where(id: [1, 2]).atomically.update_all(2, name: '')
# => 2

User.where(id: [1, 2, 3]).atomically.update_all(2, name: '')
# => 0