How to use pg_search_scope with Mobility for translated attributes? - internationalization

Question

how can i use pg_search_scope in combination with Mobility for translated attributes? Available languages are :de and :en. Searching for category names return empty results. There mus be a way to search for locale_accessors, in my case it should be name_de || name_en depending on current i18n.locale settings.
Here's my controller method:
def index
#categories = params[:query].present? ? Category.search(params[:query]) : Category.all.includes(%i[string_translations])
end
Here's my model:
class Category < ApplicationRecord
extend Mobility
translates :name, type: :string
include PgSearch::Model
pg_search_scope :search,
against: [:name],
using: {
trigram: { threshold: 0.3, word_similarity: true }
}
end
Here's my mobility config:
Mobility.configure do
# PLUGINS
plugins do
# Backend
#
# Sets the default backend to use in models. This can be overridden in models
# by passing +backend: ...+ to +translates+.
#
# To default to a different backend globally, replace +:key_value+ by another
# backend name.
#
backend :key_value
# ActiveRecord
#
# Defines ActiveRecord as ORM, and enables ActiveRecord-specific plugins.
active_record
# Accessors
#
# Define reader and writer methods for translated attributes. Remove either
# to disable globally, or pass +reader: false+ or +writer: false+ to
# +translates+ in any translated model.
#
reader
writer
# Backend Reader
#
# Defines reader to access the backend for any attribute, of the form
# +<attribute>_backend+.
#
backend_reader
#
# Or pass an interpolation string to define a different pattern:
# backend_reader "%s_translations"
# Query
#
# Defines a scope on the model class which allows querying on
# translated attributes. The default scope is named +i18n+, pass a different
# name as default to change the global default, or to +translates+ in any
# model to change it for that model alone.
#
query
# Cache
#
# Comment out to disable caching reads and writes.
#
cache
# Dirty
#
# Uncomment this line to include and enable globally:
# dirty
#
# Or uncomment this line to include but disable by default, and only enable
# per model by passing +dirty: true+ to +translates+.
# dirty false
# Fallbacks
#
# Uncomment line below to enable fallbacks, using +I18n.fallbacks+.
# fallbacks
#
# Or uncomment this line to enable fallbacks with a global default.
# fallbacks { :pt => :en }
# Presence
#
# Converts blank strings to nil on reads and writes. Comment out to
# disable.
#
presence
# Default
#
# Set a default translation per attributes. When enabled, passing +default:
# 'foo'+ sets a default translation string to show in case no translation is
# present. Can also be passed a proc.
#
# default 'foo'
# Fallthrough Accessors
#
# Uses method_missing to define locale-specific accessor methods like
# +title_en+, +title_en=+, +title_fr+, +title_fr=+ for each translated
# attribute. If you know what set of locales you want to support, it's
# generally better to use Locale Accessors (or both together) since
# +method_missing+ is very slow. (You can use both fallthrough and locale
# accessor plugins together without conflict.)
#
# fallthrough_accessors
# Locale Accessors
#
# Uses +def+ to define accessor methods for a set of locales. By default uses
# +I18n.available_locales+, but you can pass the set of locales with
# +translates+ and/or set a global default here.
#
locale_accessors
#
# Or define specific defaults by uncommenting line below
# locale_accessors [:en, :ja]
# Attribute Methods
#
# Adds translated attributes to +attributes+ hash, and defines methods
# +translated_attributes+ and +untranslated_attributes+ which return hashes
# with translated and untranslated attributes, respectively. Be aware that
# this plugin can create conflicts with other gems.
#
# attribute_methods
end
end
Is it possible and how it works?
Thank you very much for help me out in this case!

Answer 1

You can use dynamic scope with lambda and return the config hash with the query:
pg_search_scope :search, lambda { |query|
{
against: ["name_#{I18n.locale}".to_sym],
trigram: { threshold: 0.3, word_similarity: true },
ignoring: :accents,
query: query
}
}