method

one?

rails latest stable - Class: ActiveRecord::Relation

one?(*args)

public

Returns true if there is exactly one record.

When a pattern argument is given, this method checks whether elements in the Enumerable match the pattern via the case-equality operator (===).

posts.one?(Post) # => true or false

# File activerecord/lib/active_record/relation.rb, line 325
    def one?(*args)
      return false if @none

      return super if args.present? || block_given?
      return records.one? if loaded?
      limited_count == 1
    end

one?

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