Sort out storage and use of user preferred languages.

app/controllers/application.rb

@@ -102,6 +102,15 @@ class ApplicationController < ActionController::Base
   end
   
   def set_locale
+    if @user
+      if !@user.languages.empty?
+        request.user_preferred_languages = @user.languages
+      elsif !request.user_preferred_languages.empty?
+        @user.languages = request.user_preferred_languages
+        @user.save
+      end
+    end
+
     I18n.locale = request.compatible_language_from(I18n.available_locales)
   end
 

app/controllers/browse_controller.rb

@@ -1,8 +1,8 @@
 class BrowseController < ApplicationController
   layout 'site'
 
-  before_filter :set_locale
   before_filter :authorize_web  
+  before_filter :set_locale 
   before_filter { |c| c.check_database_readable(true) }
 
   def start 

app/controllers/changeset_controller.rb

@@ -5,8 +5,8 @@ class ChangesetController < ApplicationController
   require 'xml/libxml'
 
   session :off, :except => [:list, :list_user, :list_bbox]
-  before_filter :set_locale, :only => [:list, :list_user, :list_bbox]
   before_filter :authorize_web, :only => [:list, :list_user, :list_bbox]
+  before_filter :set_locale, :only => [:list, :list_user, :list_bbox]
   before_filter :authorize, :only => [:create, :update, :delete, :upload, :include, :close]
   before_filter :require_public_data, :only => [:create, :update, :delete, :upload, :include, :close]
   before_filter :check_api_writable, :only => [:create, :update, :delete, :upload, :include]

app/controllers/changeset_tag_controller.rb

@@ -1,11 +1,8 @@
 class ChangesetTagController < ApplicationController
   layout 'site'
 
-  before_filter :set_locale
-
   def search
     @tags = ChangesetTag.find(:all, :limit => 11, :conditions => ["match(v) against (?)", params[:query][:query].to_s] )
   end
 
-
 end

app/controllers/diary_entry_controller.rb

@@ -1,8 +1,8 @@
 class DiaryEntryController < ApplicationController
   layout 'site', :except => :rss
 
-  before_filter :set_locale
   before_filter :authorize_web
+  before_filter :set_locale
   before_filter :require_user, :only => [:new, :edit]
   before_filter :check_database_readable
   before_filter :check_database_writable, :only => [:new, :edit]
@@ -20,7 +20,7 @@ class DiaryEntryController < ApplicationController
         render :action => 'edit'
       end
     else
-      @diary_entry = DiaryEntry.new(:language => @user.language)
+      @diary_entry = DiaryEntry.new(:language_code => @user.preferred_language)
       render :action => 'edit'
     end
   end

app/controllers/export_controller.rb

@@ -1,5 +1,6 @@
 class ExportController < ApplicationController
 
+  before_filter :authorize_web
   before_filter :set_locale
 
   def start

app/controllers/message_controller.rb

@@ -1,8 +1,8 @@
 class MessageController < ApplicationController
   layout 'site'
 
-  before_filter :set_locale
   before_filter :authorize_web
+  before_filter :set_locale
   before_filter :require_user
   before_filter :check_database_readable
   before_filter :check_database_writable, :only => [:new, :reply, :mark]

app/controllers/site_controller.rb

@@ -1,6 +1,6 @@
 class SiteController < ApplicationController
-  before_filter :set_locale
   before_filter :authorize_web
+  before_filter :set_locale
   before_filter :require_user, :only => [:edit]
 
   def export

app/controllers/trace_controller.rb

@@ -1,8 +1,8 @@
 class TraceController < ApplicationController
   layout 'site'
 
-  before_filter :set_locale
   before_filter :authorize_web
+  before_filter :set_locale
   before_filter :require_user, :only => [:mine, :create, :edit, :delete, :make_public]
   before_filter :authorize, :only => [:api_details, :api_data, :api_create]
   before_filter :check_database_readable, :except => [:api_details, :api_data, :api_create]

app/controllers/user_controller.rb

@@ -2,8 +2,8 @@ class UserController < ApplicationController
   layout 'site'
 
   before_filter :authorize, :only => [:api_details, :api_gpx_files]
-  before_filter :set_locale, :except => [:api_details, :api_gpx_files]
   before_filter :authorize_web, :except => [:api_details, :api_gpx_files]
+  before_filter :set_locale, :except => [:api_details, :api_gpx_files]
   before_filter :require_user, :only => [:set_home, :account, :go_public, :make_friend, :remove_friend, :upload_image, :delete_image]
   before_filter :check_database_readable, :except => [:api_details, :api_gpx_files]
   before_filter :check_database_writable, :only => [:login, :new, :set_home, :account, :go_public, :make_friend, :remove_friend, :upload_image, :delete_image]
@@ -23,8 +23,7 @@ class UserController < ApplicationController
       @user.data_public = true
       @user.description = "" if @user.description.nil?
       @user.creation_ip = request.remote_ip
-      @user.locale = Language.find_by_code(I18n.locale.to_s)
+      @user.languages = request.user_preferred_languages
-      @user.locale = Language.find_by_code("en") if @user.locale.nil?
 
       if @user.save
         flash[:notice] = I18n.t('user.new.flash create success message')

app/models/language.rb

@@ -1,7 +1,6 @@
 class Language < ActiveRecord::Base
   set_primary_key :code
 
-  has_many :users, :foreign_key => 'locale'
   has_many :diary_entries, :foreign_key => 'language'
 
   def name

app/models/user.rb

@@ -1,8 +1,6 @@
 class User < ActiveRecord::Base
   require 'xml/libxml'
 
-  belongs_to :language, :foreign_key => 'locale'
-  
   has_many :traces
   has_many :diary_entries, :order => 'created_at DESC'
   has_many :messages, :foreign_key => :to_user_id, :order => 'sent_on DESC'
@@ -80,6 +78,18 @@ class User < ActiveRecord::Base
     return el1
   end
 
+  def languages
+    attribute_present?(:languages) ? read_attribute(:languages).split(",") : []
+  end
+
+  def languages=(languages)
+    write_attribute(:languages, languages.join(","))
+  end
+
+  def preferred_language
+    languages.find { |l| Language.find(:first, :conditions => { :code => l }) }
+  end
+
   def nearby(radius = 50, num = 10)
     if self.home_lon and self.home_lat 
       gc = OSM::GreatCircle.new(self.home_lat, self.home_lon)

db/migrate/035_change_user_locale.rb

@@ -0,0 +1,15 @@
+require 'lib/migrate'
+
+class ChangeUserLocale < ActiveRecord::Migration
+  def self.up
+    remove_foreign_key :users, [:locale], :languages, [:code]
+
+    rename_column :users, :locale, :languages
+  end
+
+  def self.down
+    rename_column :users, :languages, :locale
+
+    add_foreign_key :users, [:locale], :languages, [:code]
+  end
+end

vendor/plugins/http_accept_language/lib/http_accept_language.rb

@@ -22,6 +22,12 @@ module HttpAcceptLanguage
     []
   end
 
+  # Sets the user languages preference, overiding the browser
+  #
+  def user_preferred_languages=(languages)
+    @user_preferred_languages = languages.join(",")
+  end
+
   # Finds the locale specifically requested by the browser.
   #
   # Example: