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POvalidations for the model form
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  1. POvalidations for the model form
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    copied!<p>I have got a form which is generated by model object. </p> <pre><code>&lt;%= form_for(@pages) do |f| %&gt; &lt;p&gt; &lt;%= f.label :title %&gt;&lt;br /&gt; &lt;%= f.text_field :title %&gt; &lt;/p&gt; &lt;% end %&gt; </code></pre> <p>Here is the controller method for this:</p> <pre><code>def new @pages = Page.new respond_to do |format| format.html # new.html.erb format.json { render :json =&gt; @post } end end </code></pre> <p>Here is the model code:</p> <pre><code>class Page &lt; ActiveRecord::Base validates :title, :presence =&gt; true end </code></pre> <p>Now, how can I validate the form on submission.(i know that submit button is not there, i will add it later). I have used <code>&lt;%= f.error_messages %&gt;</code> in the form but it is giving me error : </p> <pre><code>NoMethodError in Pages#new Showing C:/rorapp/app/views/pages/_form.html.erb where line #2 raised: undefined method `error_messages' for #&lt;ActionView::Helpers::FormBuilder:0x49b9ca8&gt; Extracted source (around line #2): 1: &lt;%= form_for(@pages) do |f| %&gt; 2: &lt;%= f.error_messages %&gt; 3: &lt;p&gt; 4: &lt;%= f.label :title %&gt;&lt;br /&gt; 5: &lt;%= f.text_field :title %&gt; Trace of template inclusion: app/views/pages/new.html.erb Rails.root: C:/rorapp Application Trace | Framework Trace | Full Trace app/views/pages/_form.html.erb:2:in `block in _app_views_pages__form_html_erb__975660997_39217440' app/views/pages/_form.html.erb:1:in `_app_views_pages__form_html_erb__975660997_39217440' app/views/pages/new.html.erb:2:in `_app_views_pages_new_html_erb___256256638_47476836' app/controllers/pages_controller.rb:11:in `new' Request Parameters: {"title"=&gt;"", "author"=&gt;"", "email"=&gt;"", "body"=&gt;"", "reference"=&gt;"Google"} Show session dump Show env dump Response Headers: None </code></pre> <p>How can I validate it? </p>
 

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