Raise InvalidLocale exception when getting locale that is not available

lib/mobility.rb

@@ -208,6 +208,15 @@ def normalize_locale_accessor(attribute, locale = Mobility.locale)
       "#{attribute}_#{normalize_locale(locale)}".freeze
     end
 
+    # Raises InvalidLocale exception if the locale passed in is present but not available.
+    # @param [String,Symbol] locale
+    # @raise [InvalidLocale] if locale is present but not available
+    def enforce_available_locales!(locale)
+      if I18n.enforce_available_locales
+        raise Mobility::InvalidLocale.new(locale) unless (I18n.locale_available?(locale) || locale.nil?)
+      end
+    end
+
     protected
 
     def read_locale
@@ -216,9 +225,7 @@ def read_locale
 
     def set_locale(locale)
       locale = locale.to_sym if locale
-      if I18n.enforce_available_locales
-        raise Mobility::InvalidLocale.new(locale) unless (I18n.available_locales.include?(locale) || locale.nil?)
-      end
+      enforce_available_locales!(locale)
       storage[:mobility_locale] = locale
     end
   end

lib/mobility/instance_methods.rb

@@ -24,11 +24,13 @@ def mobility_present?(*args)
     end
 
     def mobility_set(attribute, value, locale: Mobility.locale)
+      Mobility.enforce_available_locales!(locale)
       mobility_backend_for(attribute).write(locale.to_sym, value == false ? value : value.presence)
     end
 
     def mobility_read(attribute, **options)
       locale = options.delete(:locale) || Mobility.locale
+      Mobility.enforce_available_locales!(locale)
       mobility_backend_for(attribute).read(locale.to_sym, options)
     end
   end

spec/mobility/attributes_spec.rb

@@ -153,6 +153,10 @@
           expect(article.title(locale: "fr")).to eq("foo")
         end
 
+        it "raises InvalidLocale exception if locale is not in I18n.available_locales" do
+          expect { article.title(locale: :it) }.to raise_error(Mobility::InvalidLocale)
+        end
+
         it "correctly maps other options to getter" do
           expect(backend).to receive(:read).with(:de, fallbacks: false).and_return("foo")
           expect(article.title(fallbacks: false)).to eq("foo")
@@ -197,8 +201,8 @@
       # to consider storing blank values.
       it "converts blanks to nil when receiving from backend getter" do
         Article.include described_class.new(:reader, "title", { backend: backend_klass })
-        allow(Mobility).to receive(:locale).and_return(:ru)
-        expect(backend).to receive(:read).with(:ru, {}).and_return("")
+        allow(Mobility).to receive(:locale).and_return(:cz)
+        expect(backend).to receive(:read).with(:cz, {}).and_return("")
         expect(article.title).to eq(nil)
       end
 
@@ -211,8 +215,8 @@
 
       it "does not convert false values to nil when receiving from backend getter" do
         Article.include described_class.new(:reader, "title", { backend: backend_klass })
-        allow(Mobility).to receive(:locale).and_return(:ru)
-        expect(backend).to receive(:read).with(:ru, {}).and_return(false)
+        allow(Mobility).to receive(:locale).and_return(:cz)
+        expect(backend).to receive(:read).with(:cz, {}).and_return(false)
         expect(article.title).to eq(false)
       end
 
@@ -264,15 +268,15 @@
       end
 
       context "with locale_accessors a hash" do
-        let(:options) { { locale_accessors: [:en, :pt] } }
+        let(:options) { { locale_accessors: [:en, :'pt-BR'] } }
 
         it "defines accessors for locales in locale_accessors hash" do
           expect(backend).to receive(:read).twice.with(:en, {}).and_return("enfoo")
           expect(article.title_en).to eq("enfoo")
           expect(article.title_en?).to eq(true)
-          expect(backend).to receive(:read).twice.with(:pt, {}).and_return("ptfoo")
-          expect(article.title_pt).to eq("ptfoo")
-          expect(article.title_pt?).to eq(true)
+          expect(backend).to receive(:read).twice.with(:'pt-BR', {}).and_return("ptfoo")
+          expect(article.title_pt_br).to eq("ptfoo")
+          expect(article.title_pt_br?).to eq(true)
         end
 
         it "does not define accessors for locales not in locale_accessors hash" do