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    <p>You could <a href="https://stackoverflow.com/questions/457239/is-there-a-way-to-validate-a-specific-attribute-on-an-activerecord-without-instan/457313#457313">validate the attribute by hand</a> and use <a href="http://api.rubyonrails.org/classes/ActiveRecord/Persistence.html#method-i-update_attribute" rel="nofollow noreferrer"><code>update_attribute</code></a>, that <a href="http://guides.rubyonrails.org/active_record_validations_callbacks.html#skipping-validations" rel="nofollow noreferrer">skips validation</a>. If you add <a href="https://stackoverflow.com/questions/457239/is-there-a-way-to-validate-a-specific-attribute-on-an-activerecord-without-instan/457313#457313">this to your <code>User</code></a>:</p> <pre><code>def self.valid_attribute?(attr, value) mock = self.new(attr =&gt; value) if mock.valid? true else !mock.errors.has_key?(attr) end end </code></pre> <p>And then update the attribute thusly:</p> <pre><code>if(!User.valid_attribute?('avatar', params[:user][:avatar]) # Complain or whatever. end @user.update_attribute('avatar', params[:user][:avatar]) </code></pre> <p>You should get your single attribute updated while only (manually) validating that attribute.</p> <p>If you look at how Milan Novota's <code>valid_attribute?</code> works, you'll see that it performs the validations and then checks to see if the specific <code>attr</code> had issues; it doesn't matter if any of the other validations failed as <code>valid_attribute?</code> only looks at the validation failures for the attribute that you're interested in.</p> <p>If you're going to be doing a lot of this stuff then you could add a method to User:</p> <pre><code>def update_just_this_one(attr, value) raise "Bad #{attr}" if(!User.valid_attribute?(attr, value)) self.update_attribute(attr, value) end </code></pre> <p>and use that to update your single attribute.</p>
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    1. USmu is too short
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    1. COthis would check for email validations too, just not avatar.
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    2. CO@Madhusudhan: You can set up the validation by hand and use `update_attribute`. Please see my update.
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    3. COyup that helped! thanks!
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