6: Modeling and Viewing Users, Part I in Java

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6: Modeling and Viewing Users, Part I
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--- !map:ActiveSupport::HashWithIndifferentAccess action: show id: "1" controller: users
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This is a YAML27 representation of params, which (as hinted at by the name HashWithIndifferentAccess) is basically a hash We see that its controller is users, its action is show, and its id attribute is "1" Although you will rarely have occasion to use params[:controller] or params[:action], using params[:id] to pull out the id from the URL is a common Rails idiom In particular, we used the code
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Userfind(params[:id])
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in Listing 625 to find the user with id 1 (The find method knows how to convert the string "1" into the integer 1) The debug information often provides useful feedback when developing Rails application, and I suggest getting in the habit of checking it whenever your application doesn t behave as expected
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64 Conclusion
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This chapter is the first half of the two-step process of creating a working User model Our users now have name and email attributes, together with validations enforcing several important constraints on their values We ve also taken a first small step toward a working user show page and a Users resource based on the principles of representational state transfer (REST) In 7, we ll complete the process by adding user passwords and a more useful user view If you re using Git, now would be a good time to commit if you haven t done so in a while:
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$ git add $ git commit -am "Finished first cut of the User model"
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27 The Rails debug information is shown as YAML (a recursive acronym standing for YAML Ain t Markup Language ), which is a friendly data format designed to be both machine- and human-readable
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Exercises
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65 Exercises
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1 Read through the Rails API entry for ActiveRecord::Base to get a sense of its capabilities 2 Study the entry in the Rails API for the validates method to learn more about its capabilities and options 3 Spend a couple hours playing with Rubular
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C HAPTER 7
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Modeling and Viewing Users, Part II
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In 6, we created the first iteration of a User model to represent users of our application, but the job is only half-done Virtually any website with users, including ours, needs authentication as well, but currently any user signing up for the site would only have a name and email address, with no way to verify their identity In this chapter, we ll add the password attribute needed for an initial user signup ( 8) and for signing in with an email/password combination ( 9) In the process, we ll reuse several of the ideas from 6, including migrations and validations, and also introduce some new ideas such as virtual attributes, private methods, and Active Record callbacks Once we have a working password attribute, we ll make a working action and view for showing user profiles (Section 73) By the end of the chapter, our user profiles will display names and profile photos (as indicated by the mockup in Figure 71), and they will be nicely tested with user factories
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71 Insecure Passwords
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Making industrial-strength passwords requires a lot of machinery, so we ll break the process into two main steps In this section, we ll make a password attribute and add validations The resulting User model will be functionally complete but badly insecure, with the passwords stored as plain text in the database In Section 72, we ll fix this problem by encrypting the passwords before saving them, thereby protecting our site against potential attackers
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7: Modeling and Viewing Users, Part II
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A mockup of the user profile made in Section 73
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711 Password Validations
Even though we have yet even to add a column for passwords to our database, we re already going to start writing tests for them Our initial plan is to have tests to validate the presence, length, and confirmation of passwords This is our biggest single block of tests so far, so see if you can read it all in one go If you get stuck, it might help to review the analogous validations from Section 62 or skip ahead to the application code in Listing 72 In order to minimize typos in passwords, when making a user signup page in 8 we ll adopt the common convention of requiring that users confirm their passwords To get started, let s review the user attributes hash last seen in Listing 620: