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6: Modeling and Viewing Users, Part I
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is equivalent to
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no_name_uservalid should_not == true
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Since it sounds more like natural language, writing should_not be_valid is definitely more idiomatically correct RSpec With that, our new test should fail, which we can verify with Autotest or by running the user_specrb file using the spec script:
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$ rspec spec/models/user_specrb F 1) 'User should require a name' FAILED expected valid to return false, got true /spec/models/user_specrb:14: 2 examples, 1 failure
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Now uncomment the validation (ie, revert Listing 68 back to Listing 67) to get the test to pass:
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$ rspec spec/models/user_specrb 2 examples, 0 failures
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Of course, we also want to validate the presence of email addresses The test (Listing 612) is analogous to the one for the name attribute
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Listing 612 A test for presence of the email attribute
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spec/models/user_specrb
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describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom" } end
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User Validations
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it "should require an email address" do no_email_user = Usernew(@attrmerge(:email => "")) no_email_usershould_not be_valid end end
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The implementation is also virtually the same, as seen in Listing 613
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Listing 613 Validating the presence of the name and email attributes
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app/models/userrb
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class User < ActiveRecord::Base attr_accessible :name, :email validates :name, :presence => true validates :email, :presence => true end
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Now all the tests should pass, and the presence validations are complete
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622 Length Validation
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We ve constrained our User model to require a name for each user, but we should go further: the user s names will be displayed on the sample site, so we should enforce some limit on their length With all the work we did in Section 621, this step is easy We start with a test There s no science to picking a maximum length; we ll just pull 50 out of thin air as a reasonable upper bound, which means verifying that names of 51 characters are too long (Listing 614)
Listing 614 A test for name length validation
spec/models/user_specrb
describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom" } end it "should reject names that are too long" do
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long_name = "a" * 51 long_name_user = Usernew(@attrmerge(:name => long_name)) long_name_usershould_not be_valid end end
For convenience, we ve used string multiplication in Listing 614 to make a string 51 characters long We can see how this works using the console:
>> => >> => s = "a" * 51 "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" slength 51
The test in Listing 614 should fail To get it to pass, we need to know about the validation argument to constrain length, :length, along with the :maximum parameter to enforce the upper bound (Listing 615)
Listing 615 Adding a length validation for the name attribute
app/models/userrb
class User < ActiveRecord::Base attr_accessible :name, :email :presence => true, :length => { :maximum => 50 } validates :email, :presence => true end validates :name,
With our test suite passing again, we can move on to a more challenging validation: email format
623 Format Validation
Our validations for the name attribute enforce only minimal constraints any non-blank name under 51 characters will do but of course the email attribute must satisfy more stringent requirements So far we ve only rejected blank email addresses; in this section, we ll require email addresses to conform to the familiar pattern user@examplecom Neither the tests nor the validation will be exhaustive, just good enough to accept most valid email addresses and reject most invalid ones We ll start with a couple tests involving collections of valid and invalid addresses To make these collections, it s worth
User Validations
knowing about a useful method for making arrays of strings, as seen in this console session:
>> %w[foo bar baz] => ["foo", "bar", "baz"] >> addresses = %w[user@foocom THE_USER@foobarorg firstlast@foojp] => ["user@foocom", "THE_USER@foobarorg", "firstlast@foojp"] >> addresseseach do |address| > puts address >> end user@foocom THE_USER@foobarorg firstlast@foojp
Here we ve iterated over the elements of the addresses array using the each method (Section 432) With this technique in hand, we re ready to write some basic email format validation tests (Listing 616)
Listing 616 Tests for email format validation
spec/models/user_specrb
describe User do before(:each) do @attr = { :name => "Example User", :email => "user@examplecom" } end it "should accept valid email addresses" do addresses = %w[user@foocom THE_USER@foobarorg firstlast@foojp] addresseseach do |address| valid_email_user = Usernew(@attrmerge(:email => address)) valid_email_usershould be_valid end end it "should reject invalid email addresses" do addresses = %w[user@foo,com user_at_fooorg exampleuser@foo] addresseseach do |address| invalid_email_user = Usernew(@attrmerge(:email => address)) invalid_email_usershould_not be_valid end end end