ruby on rails - Why is devise not displaying authentication errors on sign in page? -


i'm using rails 4.2

i have helper file called devise_helper.rb 

module devisehelper     def devise_error_messages!         return "" if resource.errors.empty?      messages = resource.errors.full_messages.map { |msg| content_tag(:li, msg) }.join     sentence = i18n.t("errors.messages.not_saved",                   count: resource.errors.count,                   resource: resource.class.model_name.human.downcase)       html = <<-html      <div class="row">      <div class="large-12 columns">         <div data-alert class="alert-box alert radius">           <h4>#{sentence}</h4>           <ul>#{messages}</ul>         </div>      </div>      </div>      html      html.html_safe   end end

to customize error messages , it's working registrations , passwords pages, not sessions pages. why this? know can add this:

  <div class="row">     <% if notice %>       <div data-alert class="alert-box info radius">         <%= notice %><%= link_to "x", '#', :class => 'close' %>       </div>     <% end %>     <% if alert %>       <div data-alert class="alert-box alert radius">         <%= alert %><%= link_to "x", '#', :class => 'close' %>       </div>     <% end %>   </div>

to application.html.erb file , error messages display there, don't understand why have add when have devise helper already. passwords , registrations, had add <%= devise_error_messages! %> sessions pages don't seem work way. i'm not sure if how devise works or if there's i'm missing.

edit: generated sessions controller never changed in since generating it. understand, devise use default controller until change 1 generated. passwords controller well. did make changes registrations controller configure permitted parameters.

class users::sessionscontroller < devise::sessionscontroller  end

a login blank/wrong fields does not trigger (your) validations on model, , therefore won't show validation errors !

if debug byebug (in first line of view example), you'll notice

resource.errors.count # => 0 flash # => ....@flashes={"alert"=>"invalid email or password."}

devise populates "alert flash" specific sign in error messages unique context of sign-in.

why not see model validation error messages ? because wouldn't make sense : suppose model has mandatory :gender attribute validates_presence_of :gender. if normal model errors added, see "gender cannot blank" in list of errors when user tries sign in wrong login :oops:.

devise_error_messages! specific devise method meant show specific errors. can think of partial validation on fields used sign in (and defined in devise config file)

workaround :

if want show error messages, explicitely run validations :

at beginning of devise_error_messages!

resource.validate # generate errors , populate `resource.errors`

i believe shouldn't mess other actions work (register, etc.)


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