feat: added support for lastLocaleField

README.md

@@ -91,7 +91,7 @@ Redirects user with permanent `302` redirect to their detected locale if a valid
 
 It also sets the cookie `locale` for future requests to their detected locale.
 
-This also stores the `last_locale` for a user via `ctx.state.user.save()`.
+This also stores the `last_locale` (or whatever you configure the property name to be in the config option `lastLocaleField`) for a user via `ctx.state.user.save()`.
 
 
 ## Options
@@ -122,7 +122,8 @@ const i18n = new I18N({
     __h: 'th',
     __mf: 'tmf'
   },
-  register: i18n.api
+  register: i18n.api,
+  lastLocaleField: 'last_locale'
 });
 ```
 

src/index.js

@@ -36,7 +36,8 @@ class I18N {
           __h: 'th',
           __mf: 'tmf'
         },
-        register: i18n.api
+        register: i18n.api,
+        lastLocaleField: 'last_locale'
       },
       config
     );
@@ -204,9 +205,9 @@ class I18N {
     debug('set cookies for locale "%s"', locale);
 
     // if the user is logged in and ctx.isAuthenticated() exists,
-    // then save it as `last_locale`
+    // then save it as `last_locale` (variable based off lastLocaleField)
     if (isFunction(ctx.isAuthenticated) && ctx.isAuthenticated()) {
-      ctx.state.user.last_locale = locale;
+      ctx.state.user[this.config.lastLocaleField] = locale;
       try {
         await ctx.state.user.save();
       } catch (err) {