Models else Votecreate(attributes) end end in Java

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Models else Votecreate(attributes) end end
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def selfvoted_down_for_user_id(user_id, page, per_page = 25) entry_ids_for_user(user_id, "down", page, per_page) end def selfvoted_up_for_user_id(user_id, page, per_page = 25) entry_ids_for_user(user_id, "up", page, per_page) end def selfentry_ids_for_user(user_id, value, page, per_page) votes = paginate_by_user_id_and_value( user_id, value, :page => page, :per_page => per_page) votesmap {|vote| voteentry_id} end end
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The first four lines of this model provide the necessary validations The vote value may only be an up or a down, each user may have only one vote per entry ID, and an entry ID and user ID are required If a validation error occurs, the service responds with a 400 error and the JSON representation of the ActiveRecord errors The named scopes provide the finders that will be used in the various service API calls They provide calls to to find up votes, down votes, votes by user ID, and votes by entry ID The remaining methods wrap up the logic that the service will provide The API needs to create a vote or update its vote value through the create_or_update method The remaining methods return only the data needed for service responses Note that the entry_ids_for_user method uses the Will Paginate gem (http://wikigithubcom/mislav/will_paginate) to provide pagination This model is a very simple representation for the functionality needed by the vote service For example, it s not storing any aggregate stats Instead, everything is calculated on the fly In order to get the service up quickly, this is fine, but over time it will most likely migrate to a more denormalized design This could include additional tables or indexes for looking up votes by either user or entry or counter caches to store totals
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5 Implementing Services
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Remember that one of the big advantages of using services is encapsulation These kinds of changes can be made to the underlying models over time, with the service consumers remaining blissfully ignorant In a standard Rails application, this is much more difficult because there may be many more points of entry directly to the vote model With the vote service, the only thing that touches the model is the service layer itself
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A full Rails application can be created to serve up the vote service To start it off, you have to go through the regular steps to create the Rails application, the vote model, and the vote controller:
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rails votes-service /script/generate model vote entry_id:string \ user_id:string value:string /script/generate controller votes
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The three commands shown here create the basic structures for the Rails service The following sections show examples for both Rails 23 and Rails 3 Many readers may still be running Rails 23, but feel free to skip to the next section if you ve already upgraded to Rails 3
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You need to define the service entry points in the routes The following section covers how to use routes in Rails 23 to specify the HTTP entry points You edit the routes to create the public entry points for the service These declarations in routesrb represent the entire public interface for the vote service:
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mapconnect 'api/v1/votes/entries/:entry_id/users/:user_id', :controller => "votes", :action => "create", :method => :put mapuser_up_votes 'api/v1/votes/users/:user_id/up', :controller => "votes", :action => "entry_ids_voted_up_for_user" mapuser_down_votes 'api/v1/votes/users/:user_id/down', :controller => "votes", :action => "entry_ids_voted_down_for_user"
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mapentry_totals 'api/v1/votes/entries/totals', :controller => "votes", :action => "totals_for_entries" mapuser_votes 'api/v1/votes/users/:user_id/votes', :controller => "votes", :action => "votes_for_users" mapuser_totals 'api/v1/votes/users/:user_id/totals', :controller => "votes", :action => "totals_for_user"
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As you can see, this interface doesn t use routes in the standard RESTful resources style The first route specifies the controller and action for creating a vote The following named routes show how votes and the aggregate totals can be retrieved Now the actions must be created in the vote controller to handle each public API call
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