Switch from user defined project fields to project settings

app/controllers/messenger_settings_controller.rb

@@ -0,0 +1,35 @@
+# Redmine Messenger plugin for Redmine
+
+class MessengerSettingsController < ApplicationController
+  layout 'base'
+
+  before_action :find_project, :authorize, :find_user
+
+  def save
+    setting = MessengerSetting.find_or_create @project.id
+    begin
+      setting.transaction do
+        # setting.auto_preview_enabled = auto_preview_enabled
+        setting.assign_attributes(params[:setting])
+        setting.save!
+      end
+      flash[:notice] = l(:notice_successful_update)
+    rescue => e
+      flash[:error] = 'Updating failed.' + e.message
+    end
+
+    redirect_to controller: 'projects', action: 'settings', id: @project, tab: 'messenger'
+  end
+
+  private
+
+  def find_project
+    @project = Project.find(params[:id])
+  rescue ActiveRecord::RecordNotFound
+    render_404
+  end
+
+  def find_user
+    @user = User.current
+  end
+end