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POHow to only change one attribute in a model using form_for in Rails
 

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  1. POHow to only change one attribute in a model using form_for in Rails
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    <p>I want to change my User model's profile attribute which is just a string in a form_for. I am running into a problem where my password is getting set to blank when I update my profile attribute.</p> <p>That is, my user account has a password, but when I change my profile, my password becomes blank. The next time I try to log in, I just leave the password field blank.</p> <p><strong>How do I change my profile field without changing my password?</strong></p> <p>Thanks.</p> <p>Here is my form below and update action. I'm passing a hidden field called updating_password which is a boolean for whether or not password validation and confirmation is required.</p> <p>edit_profile.html.erb</p> <pre><code>&lt;%= form_for @user, :html =&gt; { :multipart =&gt; true } do |f| %&gt; &lt;%= f.label :profile %&gt; &lt;%= f.text_area :profile%&gt; &lt;%= f.hidden_field :updating_password, :value =&gt; "false" %&gt; &lt;%= submit_tag "update" %&gt; &lt;% end %&gt; </code></pre> <p>users_controller.rb</p> <pre><code>def update @user = User.find(params[:id]) @user.updating_password = params[:user][:updating_password] #for updating profile only if(@user.updating_password == 'false') if @user.update_attribute('profile', params[:user][:profile]) redirect_to @user else @title = "Edit user" render 'edit' end end #for updating everything else including password if(@user.updating_password == 'true') if @user.update_attributes(params[:user]) redirect_to @user else @title = "Edit user" render 'edit' end end end </code></pre> <p>I'll add the relevant updating_password snippet from my user.rb file:</p> <pre><code>validates_presence_of :password, :if =&gt; :should_validate_password? validates_confirmation_of :password, :if =&gt; :should_validate_password? def should_validate_password? updating_password || new_record? end </code></pre>
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    1. COWhat authentication framework are you using? Devise, for example, saves the password encrypted as `encrypted_password`, and the normal, unencrypted `password` field remains blank except during the process of it being set or changed.
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      1. POHow to only change one attribute in a model using form_for in Rails
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    2. CO@Russell I didn't use any framework. You are correct though, I found my solution at this post http://stackoverflow.com/a/8790881/1154722 My model now has `before_save :encrypt_password, :unless => Proc.new { |u| u.password.blank? }` and it works.
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    3. COGlad to hear you sorted it!
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