Rails method JSON rendering

Question

I have a listings_controller in my rails app along with a Listing model. The db consists of listings each with name, latitude, longitude, etc.

There is a method in my listing_controller that when called should return a JSON object to the caller.

the JSON object should get its data from the corresponding Listings model. However, I want the JSON object to only contains the name, latitude, longitude of each listing and not other attributes of the model. How can I restrict this?

Right now when the method returns a JSON object it includes all the attributes of each listing.

Here is the current implementation:

def list  
@listings = Listing.order(:name)  
render :text=>(@listings).to_json()

end

jdoe · Accepted Answer · 2012-04-18 20:10:03Z

1

How about to replace:

@listings = Listing.order(:name)

with:

@listings = Listing.order(:name).select([:name, :latitude, :longitude])

answered Apr 18, 2012 at 20:10

jdoe

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DanS · Accepted Answer · 2012-04-18 19:44:51Z

0

I recommend looking at the rabl gem. It's a templating system for easily and flexibly generating json (among other things).

There is also a free railscast.

answered Apr 18, 2012 at 19:44

DanS

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Patrick · Accepted Answer · 2012-04-18 19:49:09Z

0

You could check out the active_model_serializers gem.

If you don't want all that, you could just manually create a hash:

render :text => {name: @listing.name, lat:@listing.lat, long:@listing.long}.to_json

answered Apr 18, 2012 at 19:49

Patrick

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