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How to convert a ruby hash object to JSON? So I am trying this example below & it doesn't work?
I was looking at the RubyDoc and obviously Hash object doesn't have a to_json method. But I am reading on blogs that Rails supports active_record.to_json and also supports hash#to_json. I can understand ActiveRecord is a Rails object, but Hash is not native to Rails, it's a pure Ruby object. So in Rails you can do a hash.to_json, but not in pure Ruby??
car = {:make => "bmw", :year => "2003"} car.to_json 
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The most simplest way to convert a json into a Ruby object is using JSON. parse and OpenStruct class. If there are more subsequence keys after the response , the object. response will returns another instance of the OpenStruct class holding the subsequence methods as those subsequence keys.
Dumps obj as a JSON string, i.e. calls generate on the object and returns the result. If anIO (an IO-like object or an object that responds to the write method) was given, the resulting JSON is written to it. If the number of nested arrays or objects exceeds limit, an ArgumentError exception is raised.
One of the numerous niceties of Ruby is the possibility to extend existing classes with your own methods. That's called "class reopening" or monkey-patching (the meaning of the latter can vary, though).
So, take a look here:
car = {:make => "bmw", :year => "2003"} # => {:make=>"bmw", :year=>"2003"} car.to_json # NoMethodError: undefined method `to_json' for {:make=>"bmw", :year=>"2003"}:Hash # from (irb):11 # from /usr/bin/irb:12:in `<main>' require 'json' # => true car.to_json # => "{"make":"bmw","year":"2003"}" As you can see, requiring json has magically brought method to_json to our Hash.
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require 'json/ext' # to use the C based extension instead of json/pure puts {hash: 123}.to_json If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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