Method: PStore#fetch

Defined in:
lib/pstore.rb

#fetch(key, default = PStore::Error) ⇒ Object

Like #[], except that it accepts a default value for the store. If the key does not exist:

  • Raises an exception if default is PStore::Error.

  • Returns the value of default otherwise:

    example_store do |store|
  store.transaction do
    store.fetch(:nope, nil) # => nil
    store.fetch(:nope)      # Raises an exception.
  end
end

Raises an exception if called outside a transaction block.



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# File 'lib/pstore.rb', line 436

def fetch(key, default=PStore::Error)
  in_transaction
  unless @table.key? key
    if default == PStore::Error
      raise PStore::Error, format("undefined key '%s'", key)
    else
      return default
    end
  end
  @table[key]
end