Rspec - Check that a field is of type json

Question

In Rails I have a field that is supposed to save json data. It's of type json. My current Rspec is as follows:

 it 'My field has some json data saved' do person = People.last saved_national_id_data = JSON.parse(person.raw_national_id_data) # check some attributes have proper data end

Now here I'm assuming that the field is json. Is there a way in Rspec to check that the returned data for this field is of type json? Example:

expect(saved_national_id_data).to be_json

There's no JSON type. Unparsed JSON is a string, parsed JSON is a Hash in Ruby. Answer below is a good direction. — Mike Szyndel
– Mike Szyndel, Commented Aug 4, 2022 at 11:14

Mehmet Adil İstikbal · Accepted Answer · 2022-08-04 10:50:36Z

1

You can test it like this:

unparsable_json = ":a => 'b'" expect { JSON.parse(unparsable_json)}.to_not raise_error # It will return: RSpec::Expectations::ExpectationNotMetError: expected no Exception, got #<JSON::ParserError: 859: unexpected token at ':ok => 'a'' parsable_json = "\"ok\"" expect{JSON.parse(parsable_json)}.to_not raise_error # It will pass the test

answered Aug 4, 2022 at 10:50

Mehmet Adil İstikbal

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3 Comments

Mike Szyndel Over a year ago

This is definitely a good direction, especially if JSON comes from and external system. It's possible to go further than that, and do something like expect(JSON.dump(JSON.parse(person.raw_national_id_data))).to eq person.raw_national_id_data to make sure that this JSON deserializes and serializes to the same thing. It is pretty strict though so you may run into issues.

Mike Szyndel Over a year ago

Another way would be to apply some kind of JSON schema ruby-toolbox.com/search?q=json+schema

mrateb Over a year ago

Thanks Mehmet this will do, and thanks @MikeSzyndel for the suggestions

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