How do I convert an array to a JSON object

Question

I am new to ROR, I have some seed data stored in my database table and a YAML file. I have been loading the yaml file and converting it into a JSON which I parsed and displayed to the client.

Something like this.

controller.rb

def template_library
    @template_library_all= YAML::load(File.open('./db/seeds/template_library.yml'))
end

In my view I did

reports.html.slim

javascript:
  var templateLibraryJSON = #{@template_library_all.to_json.html_safe};

So now I want to use the model to get the data from the database and parse it into JSON, instead of using a static file.

What I have done so far.

def query_library
@template_library_JSON = TemplateLibrary.all.map { |i| ['file_name:' , [i.file_name]]}
end

in my view

javascript:
  var templateJSON = #{@template_library_JSON.to_json.html_safe};

this returns me a JSON which looks like a JSON array.

[["file_name:", ["daily_data_count_report"]]]

Do I have to construct the JSON object ?

Can you try var templateJSON = #{j @template_library_JSON.to_json} (j is an alias for escape_javascript) ? And if not working, this: var templateJSON = #{j @template_library_JSON.as_json} (using as_json instead of to_json) — MrYoshiji
– MrYoshiji, Commented Sep 30, 2013 at 21:01
That didn't work, for some reason ruby adds escaping quotes and it breaks the view. But my concern was that I was not getting a valid JSON object which I can use in my JS — yesh
– yesh, Commented Sep 30, 2013 at 21:05
Hi, please edit your question and add en example of a JSON you want as an output, it is really not clear what you are trying to achieve. Do you want it to be [{"file_name": "daily_data_count_report"}]? — mechanicalfish
– mechanicalfish, Commented Sep 30, 2013 at 22:46

Asherlc · Accepted Answer · 2013-09-30 23:19:44Z

1

It looks like your #map call returns an array of arrays, not a hash. Try this instead:

@template_library_JSON = TemplateLibrary.all.map { |i| { :file_name => i.file_name } }

answered Sep 30, 2013 at 23:19

Asherlc

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