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POOnly validate an Rails3 Model when an value entered
 

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    <p>I need to validate a filed called phone_number in my rails3 app. This filed is optional but when a user enter a phone_number i will check the format. The RSpec2 test runs fine but when i go to the sign_up view and don't touch the phone_number field i become an "Phone number is too short (minimum is 6 characters)" and "Phone number is invalid" error.</p> <p>What is the problem in my model? My target is to validate the phone_number if a user enter this if the number blank i will save an nil in my database.</p> <p>This is my User model:</p> <pre><code>class User &lt; ActiveRecord::Base belongs_to :address accepts_nested_attributes_for :address # Include default devise modules. Others available are: # :token_authenticatable, :confirmable, :lockable and :timeoutable devise :database_authenticatable, :registerable, :recoverable, :rememberable, :trackable, :confirmable, :lockable, :validatable # Setup accessible (or protected) attributes for your model attr_readonly :username attr_accessible :email, :password, :password_confirmation, :remember_me, :phone_number, :username, :newsletter, :address_attributes validates :username, :presence =&gt; true, :uniqueness =&gt; true, :length =&gt; {:minimum =&gt; 4, :maximum =&gt; 16 }, :format =&gt; { :with =&gt; /\A[a-z0-9][a-z0-9._-]*\z/i } validates :phone_number, :length =&gt; {:minimum =&gt; 6, :maximum =&gt; 25}, :format =&gt; { :with =&gt; /\A\S[0-9\+\/\(\)\s\-]*\z/i }, :allow_nil =&gt; true validates :address, :presence =&gt; true end </code></pre> <p>My Rspec Method to test the phone_number:</p> <pre><code>it "should be valid without an phonenumber" do Factory.build(:user, :phone_number =&gt; nil).should be_valid end it "should be invalid with an invalid phonenumber" do invalid_phonenumbers.each do |invalid| Factory.build(:user, :phone_number =&gt; invalid).should_not be_valid end end it "should be valid with an valid phonenumber" do valid_phonenumbers.each do |valid| Factory.build(:user, :phone_number =&gt; valid).should be_valid end end def invalid_phonenumbers ["Hans Wurst","+49 221 Hans","Gebe ich nicht ein"," ","110",""] end def valid_phonenumbers ["+492203969534","0221/549534","0800-2222 800","+49-0221-2222-390","+49 (221) / 549534 - 23","+49 (0) 221 / 549534 - 23","0221269534"] end </code></pre>
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