Ruby on Rails to_json problem with :include

Question

I have the following code

@asset = Asset.first(
  :include => [
    :asset_statuses => [
      :asset_status_name, 
      {:asset_location => [
        {:asset_floor => :asset_building}
      ]}
    ],
    :asset_type => [
      :asset_category => :asset_department
    ]
  ],

(probably not the best DB table desing but that's what I have to use)

The Asset.first works correctly and it brings back the data correctly but when I try to use the same :include in the to_json method it fails with the followings error:

@asset.to_json( 
  :include => [
    :asset_statuses => [
      :asset_status_name,
      {:asset_location => [
        {:asset_floor => :asset_building}
      ]}
    ],
    :asset_type => [
      :asset_category => :asset_department]
    ] 
)

NoMethodError (undefined method `macro' for nil:NilClass):

The to_json method has the same :include syntax as find; I don't understand why it is not working.

tfwright · Accepted Answer · 2010-01-10 02:01:47Z

23

In case anyone else runs into a bizarre related issue that I did...to_json will also return this error when you try to include an association that is not defined on the model.

answered Jan 10, 2010 at 2:01

tfwright

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MattMcKnight · Accepted Answer · 2009-12-18 20:50:08Z

8

I think the to_json :include syntax is a little different.

I usually do

@asset.to_json(:include => { :asset_statuses => {
                             :include => :asset_status_name}})

(and start with a small one then add all of the other stuff. annoying schema!)

answered Dec 18, 2009 at 20:50

MattMcKnight

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Mike Pollitt · Accepted Answer · 2011-10-31 01:15:35Z

7

I got this error when trying to mix 1st and 2nd order relationships in a single to_json call. Here is what I originally had:

render :json => @reports.to_json(:include => 
   [:report_type, :organisation, :analysis => {:include => :upload}]

which throws the "undefined method `macro' for nil:NilClass" exception above.

Here's how I fixed it:

render :json => @reports.to_json(:include => 
   {:report_type => {}, :organisation => {}, 
    :analysis => {:include => {:upload => {}}}})

The Array will work for single-order relationships, but for second order relationships, the containing object needs to be a Hash.

answered Oct 31, 2011 at 1:15

Mike Pollitt

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Comments

user773093 · Accepted Answer · 2011-05-27 12:41:13Z

2

I had this problem when i overrided the as_json function

def as_json(options={})
  if options[:admin] 
    super(:methods => [:url_thumb] )
  else
    super(options.merge( :only => :id ))
  end
end

for some reason when you call the as_json or to_json on an array with no arguments the options became nil.

The fix is:

def as_json(options={})
  options = {} if options.nil?
  if options[:admin] 
    super(:methods => [:url_thumb] )
  else
    super(options.merge( :only => :id ))
  end
end

answered May 27, 2011 at 12:41

user773093

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