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Ruby on Rails - Render JSON

I have the following controller:

@moulding = Moulding.find( params[:id].split(","), :select => 'id, cost, width' )
@mount = MaterialCost.find(1).cost_per_square_mm
@glass = MaterialCost.find(2).cost_per_square_mm
@backing_board = MaterialCost.find(3).cost_per_square_mm
@vat = AppOption.find( 1, :select => 'value' )
@wastage = AppOption.find( 2, :select => 'value' )
@markup = AppOption.find( 3, :select => 'value' )

respond_to do |format|
  format.json { render :json => { :moulding => @moulding, :mount => @mount, :glass => @glass, :backing_board => @backing_board, :vat => @vat, :wastage => @wastage, :markup => @markup } }
end

The JSON output is as follows:

{"moulding":[{"moulding":{"cost":"3.1","id":2,"width":45}},{"moulding":{"cost":"1.5","id":4,"width":30}},{"moulding":{"cost":"2.1","id":6,"width":50}}],"mount":"0.00000246494303242769","glass":"0.0000032426589803639","backing_board":"0.00000135110790848496","vat":{"app_option":{"value":"17.5"}},"wastage":{"app_option":{"value":"20"}},"markup":{"app_option":{"value":"3"}}}

I would like JSON to be in the following format:

{"mouldings":[{"2":{"cost":"3.1","width":45}},{"4":{"cost":"1.5","width":30}},{"6":{"cost":"2.1","width":50}}],"mount":"0.00000246494303242769","glass":"0.0000032426589803639","backing_board":"0.00000135110790848496","vat":{"app_option":{"value":"17.5"}},"wastage":{"app_option":{"value":"20"}},"markup":{"app_option":{"value":"3"}}}

The reason I want to do this is because I can extract data for a specific mouldingon idfrom a JSON string. How to reformat processed JSON?

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1 answer

In my initial answer, I made the erroneous assumption that @moulding was the only object when in fact it was a collection of objects. In this case, the answer will work. To do what you want for molding, you have to repackage a set of objects. It will look like this:

@moulding.collect! do |moulding|
    { moulding.id => {:cost=>moulding.cost, :width=>moulding.width}}
end

respond_to do |format|
    format.json { render :json => { :moulding => @moulding, :mount => @mount, :glass => @glass, :backing_board => @backing_board, :vat => @vat, :wastage => @wastage, :markup => @markup } }
end

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format.json { render :json => { @moulding.id => @moulding, :mount => @mount, :glass => @glass, :backing_board => @backing_board, :vat => @vat, :wastage => @wastage, :markup => @markup } }

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