undefined method `map' for "translation missing: en-US.i18n.plural.keys":String

[JeremiahChurch]

fairly standard rails 6 app.

stock standard i18n_active_record.rb initializer with the only addition being Missing

require 'i18n/backend/active_record'

Translation = I18n::Backend::ActiveRecord::Translation

if Translation.table_exists?
  I18n.backend = I18n::Backend::ActiveRecord.new

  I18n::Backend::ActiveRecord.include I18n::Backend::Memoize
  I18n::Backend::Simple.include I18n::Backend::Memoize
  I18n::Backend::Simple.include I18n::Backend::Pluralization

  I18n::Backend::Chain.send(:include, I18n::Backend::ActiveRecord::Missing)

  I18n.backend = I18n::Backend::Chain.new(I18n::Backend::Simple.new, I18n.backend)
end

I get the exception on line 45 of active_record/missing.rb

keys = count ? I18n.t('i18n.plural.keys', :locale => locale).map { |k| [key, k].join(FLATTEN_SEPARATOR) } : [key]

count is 1

a one line change to the failing line of count && count > 1 fixes my issue. I'm happy to do a PR for that but wanted to see if others are having a similar issue or if I have a config problem somewhere.

[timfjord]

@JeremiahChurch in order to use this extension you need to add something like this

en:
  i18n:
    plural:
      keys: [:zero, :one, :other]

see https://github.com/svenfuchs/i18n-active_record/blob/master/lib/i18n/backend/active_record/missing.rb#L16-L28
this way t calls with count parameter will be correctly persisted.

It doesn't really matter what is the value of count we only care about its presence.

[JeremiahChurch]

@timfjord Thank you so much for setting me straight!

I received psych errors trying to use the array of keys the example way but reformatting it to the other format has everything working.

en:
  i18n:
    plural:
      keys:
        - :zero
        - :one
        - :other

Might I suggest a small doc tweak to that file to make it clear that keys is required for the Missing module to work correctly?

[timfjord]

Sure, feel free to open a PR with the tweak.

[timfjord]

This is now mentioned in the README