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    copied!<p><strong>[Update]</strong> Jan/2013 to Rails 3.2.x - update syntax; add spec</p> <p>Inspired by new <a href="http://lindsaar.net/2010/1/31/validates_rails_3_awesome_is_true" rel="noreferrer">validation</a> methods in Rails 3.0 I'm adding this tiny Validator. I call it <code>ReduceValidator</code>.</p> <p><em><code>lib/reduce_validator.rb</code></em>:</p> <pre><code># show only one error message per field # class ReduceValidator &lt; ActiveModel::EachValidator def validate_each(record, attribute, value) return until record.errors.messages.has_key?(attribute) record.errors[attribute].slice!(-1) until record.errors[attribute].size &lt;= 1 end end </code></pre> <p>My Model looking like - notice the <strong><code>:reduce =&gt; true</code></strong>:</p> <pre><code>validates :title, :presence =&gt; true, :inclusion =&gt; { :in =&gt; %w[ Mr Mrs ] }, :reduce =&gt; true validates :firstname, :presence =&gt; true, :length =&gt; { :within =&gt; 2..50 }, :format =&gt; { :without =&gt; /^\D{1}[.]/i }, :reduce =&gt; true validates :lastname, :presence =&gt; true, :length =&gt; { :within =&gt; 2..50 }, :format =&gt; { :without =&gt; /^\D{1}[.]/i }, :reduce =&gt; true </code></pre> <p>Works like a charm in my current Rails Project. The advantageous is, i've put the validator only on a few fields not all.</p> <p><em><code>spec/lib/reduce_validator_spec.rb</code></em>:</p> <pre><code>require 'spec_helper' describe ReduceValidator do let(:reduce_validator) { ReduceValidator.new({ :attributes =&gt; {} }) } let(:item) { mock_model("Item") } subject { item } before(:each) do item.errors.add(:name, "message one") item.errors.add(:name, "message two") end it { should have(2).error_on(:name) } it "should reduce error messages" do reduce_validator.validate_each(item, :name, '') should have(1).error_on(:name) end end </code></pre>
 

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