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As expected, the spec fails to run correctly before it even gets to the specs section To get that far, the user model file and the basic service have to be created
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To create the user model, a migration file and a model file need to be created You create a file named 001_create_usersrb in the /db/migrate directory:
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class CreateUsers < ActiveRecord::Migration def selfup create_table :users do |t| tstring :name tstring :email tstring :password tstring :bio ttimestamps end end def selfdown drop_table :users end end
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The file contains the ActiveRecord migration logic to set up the users table The fields for the name, email address, password, and bio fields are all there as string types When the migration is done, you can add the user model You create a file called userrb in the /models directory:
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class User < ActiveRecord::Base validates_uniqueness_of :name, :email
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1 Implementing and Consuming Your First Service def to_json super(:except => :password) end end
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The model contains only a few lines There is a validation to ensure that the name and email address of the user are unique The to_json method, which will be used in the implementation, has been overridden to exclude the password attribute This user model stores the password as a regular string to keep the example simple Ordinarily, a better solution would be to use Ben Johnson s Authlogic ( ttp://githubcom/binarylogic/authlogic) h The primary benefit of Authlogic in this case is its built-in ability to store a salted hash of the user password It is a big security risk to directly store user passwords, and using a popular tested library reduces the number of potential security holes in an application
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Implementing GET User
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With the model created, the next step is to create the service and start wiring up the public API The interface of a service is created through its HTTP entry points These represent the implementation of the testable public interface In the main user-service directory, you create a file named servicerb that will contain the entire service:
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require require require require 'rubygems' 'activerecord' 'sinatra' 'models/user'
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# setting up the environment env_index = ARGVindex("-e") env_arg = ARGV[env_index + 1] if env_index env = env_arg || ENV["SINATRA_ENV"] || "development" databases = YAMLload_file("config/databaseyml") ActiveRecord::Baseestablish_connection(databases[env]) # HTTP entry points # get a user by name get '/api/v1/users/:name' do user = Userfind_by_name(params[:name]) if user
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The User Service Implementation userto_json else error 404, {:error => "user not found"}to_json end end
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The beginning lines in servicerb load requirements and set up the environment The environment loading pulls an optional environment argument from the command line The implementation for the GET user is simple It opens up with a call to the Sinatra domain-specific language with the line get '/api/v1/users/:name' do, which is a call on the method get that passes in a string and a block The string specifies the path or URL pattern to match against This specifies that it should use this block for paths matching /api/v1/users/, followed by some string of characters This will be checked against only if the incoming request is a GET Inside the block lies the implementation of the get method Sinatra also provides post, put, and delete methods, which you ll use in a bit Note here that params is a hash that is automatically populated It stores the request body, if provided, and maps the symbol arguments in the URL match string In this specific case, the mapping would be {:name => "paul"} if the request URL were /api/v1/users/paul The body of the method uses the params hash to attempt to find the user If the user is found, it is returned as serialized JSON The to_json call is the last statement executed in the block, so it is the return value Sinatra puts this value in the response body with a status code of 200 Finally, the error condition of not matching the user must be gracefully handled Sinatra provides another method, called error, that is used for returning error conditions If the user isn t found, the service returns a 404 error with a JSON error message At this point, the service spec can be rerun, and everything should pass To run the service locally for additional testing, you can run the service regularly as a script, like this:
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