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gem install pauldix-entries-000gem
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Because the gem installation is completely contained in the single gem file, deployment to a server is as simple as copying the file to the server If you re using Capistrano for deployment, it is a good idea to include a task that builds the gem and copies it up to the target servers It s also possible to use a shared file service such as S3 as the source Or you may just want to check the gem files into the repository and install from there Whatever your choice, it should come down to running a single command to get the new client library gem deployed to your servers
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The first chapter of this book briefly introduces JSON in an example that creates a user service In that example, the user objects are serialized as JSON and parsed in the client Because of JSON s simple format, the example presents much of what you need to know The form that JSON takes can be summarized in a few sentences First, you start with an array or an object An array consists of ordered values, while an object is an unordered set of name/value pairs (like a Ruby hash) The mapping of JSON s object
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to Ruby hashes is part of what makes JSON so easy to work with The names in an object are strings, while the values in an array or an object can be either a number, a string, an array, or an object So arrays and objects can contain more arrays and objects This small and simple grammar makes it easy to write a JSON parser and even easier to use one There are more than a few options for parsing JSON in Ruby, but this section focuses on only two: the JSON gem and yajl-ruby The following examples use this as input to the JSON parser:
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{ "results" : [{"name" : "geoffrey"}, {"name" : "gail"}], "total" : 2, "uri" : "http://pauldixnet" }
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This sample JSON is used in this chapter to show how to access objects, arrays, and the different kinds of values
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The JSON gem is the de facto standard for parsing JSON in Ruby It has both a pure Ruby implementation and a native C implementation The C implementation offers speed improvements, while the pure Ruby version may be easier to install Installation on Ruby 18, or 19 can be done via the following command:
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gem install json
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Installation on JRuby must be done via the jgem command The gem also has a different name on JRuby It can be installed with the following command:
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jgem install json-jruby
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Now that the gem is installed, it s ready for use:
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require 'rubygems' require 'json'
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# input corresponds to the example JSON shown earlier parsed = JSONparse(input) results = parsed["results"] puts puts puts puts resultssize results[0]inspect parsed["total"] parsed["uri"] # # # # => => => => 2 {"name" => "geoffrey"} 2 "http://pauldixnet"
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The parsing logic is contained in a single line: the call to JSONparse From there, the parsed input can be manipulated through standard Ruby objects The object is parsed as a Hash, the array as an Array, the number as a Fixnum, and the string as a String The hash keys are strings, as shown on the line that assigns the results value
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YAJL Ruby
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YAJL (yet another JSON library) is a streaming JSON library written in C Streaming refers to the library s ability to parse JSON as the document comes in This can be quite handy when you re working with large files that may be difficult to keep in memory or when you re parsing JSON as it comes in from an HTTP response yajlruby is a Ruby library written by Brian Lopez that has bindings to YAJL The yajl-ruby project page (http://githubcom/brianmario/yajl-ruby) boasts that it offers speed improvements over the standard JSON gem for both generating and parsing JSON Due to its reliance on C libraries, it is available only in Ruby 18 and 19 The following command installs the gem:
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