Controller local instance variable is nil?

[herrw...@gmail.com]

Hi,

I'm puzzled and any help would be much appreciated.  I'm using gmaps4rails successfully.  If I want to show all of the records, that works fine.  This working code is commented out below.  Where I'm having problems is when I only want to show the current record.  My understanding from the hobo documentation was that @location would provide access to the current record.

"As well as setting the default DRYML context, the default actions all make the record, or collection of records, available to the view in an instance variable that follows Rails conventions. E.g. for a  ̳product‘ model, the product will be available as @product and the collection of products on an index page will be available as @products" -- Rapid Rails 3 with Hobo BETA-6: 2011-05-18 page 380

class LocationsController < ApplicationController

  hobo_model_controller

  auto_actions :all

  def show

    #@json = Location.all.to_gmaps4rails    <--- Works, but get all records instead of current

    @json = @location.to_gmaps4rails       #<--- Thought this would have worked, but fails

    #@json1 = Array.new

    #@json1 << @location

    #@json = @json1.all.to_gmaps4rails     <--- Tried this as a workaround, but it fails also

    hobo_show 

  end

end

Error Log:

NoMethodError (You have a nil object when you didn't expect it!

You might have expected an instance of Array.

The error occurred while evaluating nil.to_gmaps4rails):

  app/controllers/locations_controller.rb:16:in `show'

Rendered /usr/local/rvm/gems/ruby-1.9.3-p125/gems/actionpack-3.0.10/lib/action_dispatch/middleware/templates/rescues/_trace.erb (1.5ms)

Rendered /usr/local/rvm/gems/ruby-1.9.3-p125/gems/actionpack-3.0.10/lib/action_dispatch/middleware/templates/rescues/_request_and_response.erb (23.2ms)

Rendered /usr/local/rvm/gems/ruby-1.9.3-p125/gems/actionpack-3.0.10/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (29.4ms)

Gems (partial list):

*** LOCAL GEMS ***

activerecord (3.2.10, 3.2.9, 3.0.18, 3.0.17, 3.0.12, 3.0.10, 2.3.14)

activeresource (3.2.10, 3.2.9, 3.0.18, 3.0.17, 3.0.12, 3.0.10, 2.3.14)

activesupport (3.2.10, 3.2.9, 3.0.18, 3.0.17, 3.0.12, 3.0.10, 2.3.14)

dryml (1.3.3, 1.3.2, 1.3.0)

gmaps4rails (1.5.6)

hobo (1.3.3, 1.3.0, 1.0.1)

hobo_fields (1.3.3, 1.3.2, 1.3.0)

hobo_support (1.3.3, 1.3.2, 1.3.0)

hobofields (1.1.0, 1.0.1)

hobosupport (1.1.0, 1.0.1)

rails (3.0.10, 2.3.14)

[Bryan Larsen]

@location in the show method of the locations controller will contain
the instance, but only after Hobo has had a chance to do that for you.

Here's a few possibilities. I think for you all three will work, but
for others the order might be important.

def show
hobo_show
@json = @location...
end

def show
hobo_show do
@json = @location...
end
end

def show
@location = find_instance
@json = ...
hobo_show
end


Bryan

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[herrw...@gmail.com]

Thanks Bryan!! That did the trick.  For others using gmaps4rails, I had to create an array, so code ended up looking like:

    hobo_show

     @json1 = Array.new

     @json1 << @location

     @json = @json1.to_gmaps4rails

    end