Flowdock
Ruby on Rails latest stable (v4.2.7) - 0 notes - Superclass: ActiveRecord::ActiveRecordError

Raised when a relation cannot be mutated because it’s already loaded.

class Task < ActiveRecord::Base
end

relation = Task.all
relation.loaded? # => true

# Methods which try to mutate a loaded relation fail.
relation.where!(title: 'TODO')  # => ActiveRecord::ImmutableRelation
relation.limit!(5)              # => ActiveRecord::ImmutableRelation
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