method

include?

v8.1.1 - Show latest stable - Class: ActiveRecord::FinderMethods

include?(record)

public

Returns true if the relation contains the given record or false otherwise.

No query is performed if the relation is loaded; the given record is compared to the records in memory. If the relation is unloaded, an efficient existence query is performed, as in #exists?.

# File activerecord/lib/active_record/relation/finder_methods.rb, line 389
    def include?(record)
      # The existing implementation relies on receiving an Active Record instance as the input parameter named record.
      # Any non-Active Record object passed to this implementation is guaranteed to return `false`.
      return false unless record.is_a?(model)

      if loaded? || offset_value || limit_value || having_clause.any?
        records.include?(record)
      else
        id = if record.class.composite_primary_key?
          record.class.primary_key.zip(record.id).to_h
        else
          record.id
        end

        exists?(id)
      end
    end

include?

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