How do I display Ruby on Rails form validation error messages one at a time

Question

I m trying to understand how I can achieve this  Can anyone advise me or point me in the right direction   What I currently do  which is shown in the code snippet below  allows me to display 1 error from each field at a time   It   s not not quite exactly what I want to do    I want to display 1 error message at a time  For example     first name can t be blank     then once that error has been resolved  the next error in the array of errors should be displayed  This should keep happening until all errors have been resolved    lt    user errors each do  attr  msg    gt   lt       attr    msg   if  user errors attr  first    msg   gt    lt   end   gt

User · Accepted Answer

After experimenting for a few hours I figured it out.

<% if @user.errors.full_messages.any? %>
  <% @user.errors.full_messages.each do |error_message| %>
    <%= error_message if @user.errors.full_messages.first == error_message %> <br />
  <% end %>
<% end %>

Even better:

<%= @user.errors.full_messages.first if @user.errors.any? %>

User · Answer

I resolved it like this    lt    user errors each do  attr  msg    gt     lt li gt       lt     user errors full messages for attr  first if  user errors attr  first    msg   gt     lt  li gt   lt   end   gt    This way you are using the locales for the error messages

User · Answer

ActiveRecord stores validation errors in an array called errors   If you have a User model then you would access the validation errors in a given instance like so    user   User create params  user     create will automatically call validators  if  user errors any    If there are errors  do something      You can iterate through all messages by attribute type and validation message     This will be something like      attribute    name      message    cannot be left blank     user errors each do  attribute  message        do stuff for each error   end      Or if you prefer  you can get the full message in single string  like so      message    Name cannot be left blank     users errors full messages each do  message        do stuff for each error   end      To get all errors associated with a single attribute  do the following    if  user errors include   name      name errors    user errors  name       if name errors kind of  Array        name errors each do  error            do stuff for each error on the name attribute       end     else       error   name errors         do stuff for the one error on the name attribute      end   end end   Of course you can also do any of this in the views instead of the controller  should you want to just display the first error to the user or something

User · Answer

A better idea   if you want to put the error message just beneath the text field  you can do like this   row spacer20top    col-sm-6 form-group       f label  first name    Your First Name         f text field  first name   required   gt  true  class   form-control        f error message for  first name      What is error message for  --  Well  this is a beautiful hack to do some cool stuff    Author Shiva Bhusal   Aug 2016   in config initializers modify rails form builder rb   This will add a new method in the  f  object available in Rails forms class ActionView  Helpers  FormBuilder   def error message for field name      if self object errors field name  present        model name                self object class name downcase       id of element              error   model name    field name         target elem id               model name    field name         class name                 signup-error alert alert-danger        error declaration class    has-signup-error           lt div id     id of element    for     target elem id    class     class name    gt             self object errors field name  join                  lt  div gt            lt  -- Later JavaScript to add class to the parent element -- gt            lt script gt               document onreadystatechange   function                         id of element    parent                   addClass    error declaration class                              lt  script gt   html safe     end   rescue     nil   end end     Result   Markup Generated after error   lt div id  error user email  for  user email  class  signup-error alert alert-danger  gt has already been taken lt  div gt   lt script gt document onreadystatechange   function       error user email   parent   addClass  has-signup-error     lt  script gt    Corresponding SCSS       has-signup-error       signup-error        background  transparent        color   brand-danger        border  none             input  select        background-color   bg-danger        border-color   brand-danger        color   gray-base        font-weight  500              amp  checkbox        label           amp  before            background-color   bg-danger            border-color   brand-danger                               Note  Bootstrap variables used here

[ruby-on-rails] How do I display Ruby on Rails form validation error messages one at a time?

Examples related to ruby-on-rails

Examples related to ruby

Examples related to rubygems