class Ransack::Adapters::ActiveRecord::Context

def remove_association(association)
  return if @lock_associations.include?(association)
  @join_dependency.instance_variable_get(:@join_root).children.delete_if { |stashed|
    stashed.eql?(association)
  }
  @object.joins_values.delete_if { |jd|
    jd.instance_variables.include?(:@join_root) &&
    jd.instance_variable_get(:@join_root).children.map(&:object_id) == [association.object_id]
  }
end