Posting a json array to rails server

Question

I want to know how can I post json array directly to rails server. Say,

POST '/api/notes_bulk', HTTP/1.1
Content-Type: application/json

[{“content”:”content1”, “title”:”title1”}, {“content”:”content2”, “title”:”title2”}, {“content”:”content3”, “title”:”title3”}, {“content”:”content4”, “title”:”title4”}, {“content”:”content5”, “title”:”title5”}]

I did some search about it and all of the examples had some kind of key mapped to the array. While in my case, the json is an array at its top level. How can I get the json data in the controller code? I notice that rails wraps this data with a "_json" key, but when I accessing it, it says
Unpermitted parameters: _json, ....

shev.vadim.net · Accepted Answer · 2017-08-11 09:05:26Z

6

You can use that '_json' key to access data. To remove the warning you have to permit all the object keys from JSON array. In your case:

params.permit(_json: [:content, :title])

answered Aug 11, 2017 at 9:05

shev.vadim.net

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Comments

Joost Baaij · Accepted Answer · 2016-05-09 14:56:31Z

2

You cannot use the built-in params from Rails in this case but you can create your own parser:

def create
  contents = JSON.parse(request.raw_post)
end

The contents variable will be the array that you posted.

answered May 9, 2016 at 14:56

Joost Baaij

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Comments

Atul · Accepted Answer · 2015-07-18 06:47:57Z

0

i think the issue you are facing had got to do with strong parameters. you need to allow json params in controller. Use params.require(:object).permit( list of allowed params)

answered Jul 18, 2015 at 6:47

Atul

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1 Comment

Chris.Zou Over a year ago

The problem is that the the whole json was an array, there is no :object for me to pass into require.

Eugene · Accepted Answer · 2016-03-16 16:47:36Z

0

I think this might be late, but just post here since the question is unanswered and for future visitors.

You have to wrap you JSON string into an object. For example, you can construct you Json string such as

var contentArray = [{“content”:”content1”, “title”:”title1”}, {“content”:”content2”, “title”:”title2”}];
var contentObj = {contents: contentArray};

Before submiting it to Rails

jsonData = JSON.stringify(contentObj);

Access it in Rails controller:

myContentArray = params[:contents]

answered Mar 16, 2016 at 16:47

Eugene

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1 Comment

David Parish Over a year ago

This is not a great answer. You should not have to make your api fit rails. Posting an array is very common. Not to mention that you may not be generating the post request, an 3rd party might be and Rails should be able to process it.

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