Trying to render value of input field - ruby-on-rails

Question

Trying to work with a input value present in the source code only when the user has tried to login once (and entered a wrong password).
The scenario is as follows:
First attempt before login, part of the code looks like this:
<div class="form-group">
<label class="control-label col-md-4" for="user_email">Email</label>
<div class="col-md-8">
<input class="text-field form-control" html="{:spellcheck=>"false"}" id="user_email" name="user[email]" type="email" value="" />
</div>
</div>
After a second attempt happens, the email address that was used it's rendered in value:
<div class="form-group">
<label class="control-label col-md-4" for="user_email">Email</label>
<div class="col-md-8">
<input class="text-field form-control" html="{:spellcheck=>"false"}" id="user_email" name="user[email]" type="email" value="heregoestheemail#gmail.com" />
</div>
</div>
How can I render that email address if the user is not logged in yet? I know that once logged I'd do something like <%= current_user.email %> but there is way to get that value attribute?

Answer 1

you should work with form_for
<%= form_for #user do |f| %>
<% f.text_field :email (not sure f.email_field works)
<%= end %>
be sure #user is define in controller (#user = User.new or #user is come back from controller with errors => show #user.errors and contain precedent values)
http://guides.rubyonrails.org/form_helpers.html