[Pharo-users] nested json problem

[Roelof Wobben]

Hello, I try to use the rijksmuseum api. This gives json back for 10 paintings and the json looks like this : { "elapsedMilliseconds": 164, "count": 359, "artObjects": [ { "links": { "self": "https://www.rijksmuseum.nl/api/nl/collection/SK-C-5", "web": "https://www.rijksmuseum.nl/nl/collection/SK-C-5" }, "id": "nl-SK-C-5", "objectNumber": "SK-C-5", "title": "Schutters van wijk II onder leiding van kapitein Frans Banninck Cocq, bekend als de ‘Nachtwacht’", "hasImage": true, "principalOrFirstMaker": "Rembrandt Harmensz. van Rijn", "longTitle": "Schutters van wijk II onder leiding van kapitein Frans Banninck Cocq, bekend als de ‘Nachtwacht’, Rembrandt Harmensz. van Rijn, 1642", "showImage": true, "permitDownload": true, "webImage": { "guid": "92253da1-794d-49f4-9e3c-e4c160715f53", "offsetPercentageX": 50, "offsetPercentageY": 100, "width": 2500, "height": 2034, "url": "http://lh6.ggpht.com/wwx2vAS9DzFmmyeZefPjMtmCNOdjD80gvkXJcylloy40SiZOhdLHVddEZLBHtymHu53TcvqJLYZfZF7M-uvoMmG_wSI=s0" }, "headerImage": { "guid": "29a2a516-f1d2-4713-9cbd-7a4458026057", "offsetPercentageX": 50, "offsetPercentageY": 50, "width": 1920, "height": 460, "url": "http://lh5.ggpht.com/SgH3Qo-vYI8GGm7-b-Qt6lXgsCAIoU2VDRwO5LYSBVNhhbZCetcvc88ZPi518MTy0MHDrna4X4ZC1ymxVJVpzps8gqw=s0" }, "productionPlaces": [] }, // more results... ] } Artobjects is the part that I want to use because that is the part that contains data from 10 paintings. I have tried to parse it like this : Painting class >> fromJSON: json [ | instance | instance := self new. instance title: (json at: 'title'); painter: (json at: 'principalOrFirstMaker'); imageUrl: ((json at: 'webImage') at: 'url'). ^ instance ] and PaintingCollection class >> fromJSON: json [ | instance artObjects | instance := self new. artObjects := json at: #artObjects. artObjects do: [ :eachArtObject | instance addPainting: (Painting fromJSON: eachArtObject) ]. ^ instance ] but that does not work. Is there a better way to make this work. and if so, can someone give me a example how to make this work. This is my first project that I try to make after doing the MOOC course. Regards, Roelof