Allow users to set/update their display name in LDAP

app/controllers/settings_controller.rb

@@ -12,12 +12,21 @@ class SettingsController < ApplicationController
   end
 
   def update
-    @user.preferences.merge! user_params[:preferences]
-    @user.save!
+    @user.preferences.merge!(user_params[:preferences] || {})
+    @user.display_name = user_params[:display_name]
 
-    redirect_to setting_path(@settings_section), flash: {
-      success: 'Settings saved.'
-    }
+    if @user.save
+      if @user.display_name && (@user.display_name != @user.ldap_entry[:display_name])
+        LdapManager::UpdateDisplayName.call(@user.dn, user_params[:display_name])
+      end
+
+      redirect_to setting_path(@settings_section), flash: {
+        success: 'Settings saved.'
+      }
+    else
+      @validation_errors = @user.errors
+      render :show, status: :unprocessable_entity
+    end
   end
 
   def update_email
@@ -46,30 +55,31 @@ class SettingsController < ApplicationController
 
   private
 
-  def set_main_nav_section
-    @current_section = :settings
-  end
-
-  def set_settings_section
-    @settings_section = params[:section]
-    allowed_sections = [:profile, :account, :lightning, :xmpp]
-
-    unless allowed_sections.include?(@settings_section.to_sym)
-      redirect_to setting_path(:profile)
+    def set_main_nav_section
+      @current_section = :settings
+    end
+
+    def set_settings_section
+      @settings_section = params[:section]
+      allowed_sections = [:profile, :account, :lightning, :xmpp]
+
+      unless allowed_sections.include?(@settings_section.to_sym)
+        redirect_to setting_path(:profile)
+      end
     end
-  end
 
-  def user_params
-    params.require(:user).permit(preferences: [
-      :lightning_notify_sats_received,
-      :xmpp_exchange_contacts_with_invitees
-    ])
-  end
     def set_user
       @user = current_user
     end
 
-  def email_params
-    params.require(:user).permit(:email, :current_password)
-  end
+    def user_params
+      params.require(:user).permit(:display_name, preferences: [
+        :lightning_notify_sats_received,
+        :xmpp_exchange_contacts_with_invitees
+      ])
+    end
+
+    def email_params
+      params.require(:user).permit(:email, :current_password)
+    end
 end