Every article is identified by a token (for example 246311). For every article we have a JSON file that contains
many recommendations for that article, based on 3 different algorithms: logs, content, and myad
- The logs algorithm finds articles visited by users that also visited the current article.
- The content algorithm finds articles that contains similar text to the current article.
- The myad algorithm finds articles that have been bookmarked within the same folder that the current article.
We want to show to a visit 4 recommended articles for a particular article. As you could imagine, sometimes we don't have recommendations for all the 3 algorithms, and we have just for logs and myad, for example. Sometimes we have only 1 recommendation for a particular algorithm and 7 recommendations for another algorithm.
We need to get an Array(4) with the most homegenous list of recommendations, based in a Round-Robin approach. It means, if we have the following scenarios:
JSON file:
{
"logs": [
{
"url": "//www.archdaily.com/345048/nirma-vidyavihar-apurva-amin-architects",
"token": "345048",
"thumbnail": "//images.adsttc.com/media/images/5143/8a8e/b3fc/4baa/2c00/000e/small_jpg/NVV1_AAA_09.jpg?1363380874",
"title": "Nirma Vidyavihar / Apurva Amin Architects"
}
],
"content": [],
"myad": [
]
}
Expected result: [345048]
JSON file
{
"logs": [
{
"url": "//www.archdaily.com/790952/vigneux-sur-seine-housing-margot-duclot-architectes-associes",
"token": "790952",
"thumbnail": "//images.adsttc.com/media/images/577e/4943/e58e/cea4/f500/0149/small_jpg/MDAA_VIGNEUX_HD-4%C2%A911h45.jpg?1467894052",
"title": "Vigneux-Sur-Seine Housing / Margot-Duclot architectes associ\u00e9s"
},
{
"url": "//www.archdaily.com/802358/modular-house-dubldom-bio-architects",
"token": "802358",
"thumbnail": "//images.adsttc.com/media/images/5861/e0b7/e58e/ce50/7900/029c/small_jpg/interior-01.jpg?1482809510",
"title": "Modular House DublDom / BIO-architects"
},
{
"url": "//www.archdaily.com/788138/60-social-housing-apartments-in-rive-de-gier-tectoniques-architects",
"token": "788138",
"thumbnail": "//images.adsttc.com/media/images/5743/f056/e58e/ce1e/dd00/00d9/small_jpg/RIVE_DE_GIER_1S2-5.jpg?1464070176",
"title": "60 Social Housing Apartments in Rive-De-Gier / Tectoniques Architects"
}
],
"content": [
{
"url": "//www.archdaily.com/103678/riva-del-garda-hospital-atenastudio",
"token": "103678",
"thumbnail": "//images.adsttc.com/media/images/55f6/f706/adbc/0139/a000/02ed/small_jpg/4-325.jpg?1442248427",
"title": "Re-Development of the Former Hospital/ the New Housing City / ATENASTUDIO + 3TI PROGETTI ITALIA + KREJ ENGINEERING"
},
{
"url": "//www.archdaily.com/562873/piet-and-sarah-copper-extension-atelier-vens-vanbelle",
"token": "562873",
"thumbnail": "//images.adsttc.com/media/images/5451/8a23/e58e/ce4c/0800/0017/small_jpg/MPN116.jpg?1414629900",
"title": "Piet & Sarah - Copper Extension / Atelier Vens Vanbelle"
},
{
"url": "//www.archdaily.com/385093/centre-village-5468796-architecture",
"token": "385093",
"thumbnail": "//images.adsttc.com/media/images/51b3/aec2/b3fc/4b28/0700/00ae/small_jpg/Centre_Village_JB_06.jpg?1370730138",
"title": "Centre Village / 5468796 Architecture + Cohlmeyer Architecture Limited"
},
{
"url": "//www.archdaily.com/803992/recreational-community-center-chatelaine-nil-balexert-stendardo-menningen-architectes",
"token": "803992",
"thumbnail": "//images.adsttc.com/media/images/5886/8325/e58e/ce62/cc00/0054/small_jpg/161222_STM_41.jpg?1485210392",
"title": "Recreational Community Center Ch\u00e2telaine \u2013 Balexert / STENDARDO MENNINGEN ARCHITECTES"
}
],
"myad": [
{
"url": "//www.archdaily.com/788138/60-social-housing-apartments-in-rive-de-gier-tectoniques-architects",
"token": "788138",
"thumbnail": "//images.adsttc.com/media/images/5743/f056/e58e/ce1e/dd00/00d9/small_jpg/RIVE_DE_GIER_1S2-5.jpg?1464070176",
"title": "60 Social Housing Apartments in Rive-De-Gier / Tectoniques Architects"
},
{
"url": "//www.archdaily.com/769163/housing-in-auvry-barbusse-tectone",
"token": "769163",
"thumbnail": "//images.adsttc.com/media/images/558b/6de4/e58e/ce41/0700/01ce/small_jpg/portada_CDM_-_234.jpg?1435200988",
"title": "Housing in Auvry Barbusse / Tect\u00f4ne"
},
{
"url": "//www.archdaily.com/789357/escherpark-e2a",
"token": "789357",
"thumbnail": "//images.adsttc.com/media/images/575d/c7c3/e58e/ceb2/ac00/0148/small_jpg/E2A_Escherpark-1_RasmusNorlander.jpg?1465763767",
"title": "Escherpark / E2A"
}
]
}
Expected Result: [790952, 103678, 788138, 802358]
JSON File:
{
"content": [
{
"url": "//www.archdaily.com/103678/riva-del-garda-hospital-atenastudio",
"token": "103678",
"thumbnail": "//images.adsttc.com/media/images/55f6/f706/adbc/0139/a000/02ed/small_jpg/4-325.jpg?1442248427",
"title": "Re-Development of the Former Hospital/ the New Housing City / ATENASTUDIO + 3TI PROGETTI ITALIA + KREJ ENGINEERING"
}
],
"logs": [
{
"url": "//www.archdaily.com/790952/vigneux-sur-seine-housing-margot-duclot-architectes-associes",
"token": "790952",
"thumbnail": "//images.adsttc.com/media/images/577e/4943/e58e/cea4/f500/0149/small_jpg/MDAA_VIGNEUX_HD-4%C2%A911h45.jpg?1467894052",
"title": "Vigneux-Sur-Seine Housing / Margot-Duclot architectes associ\u00e9s"
},
{
"url": "//www.archdaily.com/802358/modular-house-dubldom-bio-architects",
"token": "802358",
"thumbnail": "//images.adsttc.com/media/images/5861/e0b7/e58e/ce50/7900/029c/small_jpg/interior-01.jpg?1482809510",
"title": "Modular House DublDom / BIO-architects"
},
{
"url": "//www.archdaily.com/788138/60-social-housing-apartments-in-rive-de-gier-tectoniques-architects",
"token": "788138",
"thumbnail": "//images.adsttc.com/media/images/5743/f056/e58e/ce1e/dd00/00d9/small_jpg/RIVE_DE_GIER_1S2-5.jpg?1464070176",
"title": "60 Social Housing Apartments in Rive-De-Gier / Tectoniques Architects"
}
],
"myad": [
]
}
Expected Result: [103678, 790952, 802358, 788138]
JSON file:
{
"logs": [
{
"url": "//www.archdaily.com/790952/vigneux-sur-seine-housing-margot-duclot-architectes-associes",
"token": "790952",
"thumbnail": "//images.adsttc.com/media/images/577e/4943/e58e/cea4/f500/0149/small_jpg/MDAA_VIGNEUX_HD-4%C2%A911h45.jpg?1467894052",
"title": "Vigneux-Sur-Seine Housing / Margot-Duclot architectes associ\u00e9s"
},
{
"url": "//www.archdaily.com/802358/modular-house-dubldom-bio-architects",
"token": "802358",
"thumbnail": "//images.adsttc.com/media/images/5861/e0b7/e58e/ce50/7900/029c/small_jpg/interior-01.jpg?1482809510",
"title": "Modular House DublDom / BIO-architects"
},
{
"url": "//www.archdaily.com/788138/60-social-housing-apartments-in-rive-de-gier-tectoniques-architects",
"token": "788138",
"thumbnail": "//images.adsttc.com/media/images/5743/f056/e58e/ce1e/dd00/00d9/small_jpg/RIVE_DE_GIER_1S2-5.jpg?1464070176",
"title": "70 Social Housing Apartments in Rive-De-Gier / Tectoniques Architects"
}
],
"content": [
{
"url": "//www.archdaily.com/103678/riva-del-garda-hospital-atenastudio",
"token": "103678",
"thumbnail": "//images.adsttc.com/media/images/55f6/f706/adbc/0139/a000/02ed/small_jpg/4-325.jpg?1442248427",
"title": "Re-Development of the Former Hospital/ the New Housing City / ATENASTUDIO + 3TI PROGETTI ITALIA + KREJ ENGINEERING"
},
{
"url": "//www.archdaily.com/562873/piet-and-sarah-copper-extension-atelier-vens-vanbelle",
"token": "562873",
"thumbnail": "//images.adsttc.com/media/images/5451/8a23/e58e/ce4c/0800/0017/small_jpg/MPN116.jpg?1414629900",
"title": "Piet & Sarah - Copper Extension / Atelier Vens Vanbelle"
},
{
"url": "//www.archdaily.com/385093/centre-village-5468796-architecture",
"token": "385093",
"thumbnail": "//images.adsttc.com/media/images/51b3/aec2/b3fc/4b28/0700/00ae/small_jpg/Centre_Village_JB_06.jpg?1370730138",
"title": "Centre Village / 5468796 Architecture + Cohlmeyer Architecture Limited"
},
{
"url": "//www.archdaily.com/803992/recreational-community-center-chatelaine-nil-balexert-stendardo-menningen-architectes",
"token": "803992",
"thumbnail": "//images.adsttc.com/media/images/5886/8325/e58e/ce62/cc00/0054/small_jpg/161222_STM_41.jpg?1485210392",
"title": "Recreational Community Center Ch\u00e2telaine \u2013 Balexert / STENDARDO MENNINGEN ARCHITECTES"
}
],
"myad": [
]
}
Expected result: [790952, 103678, 802358, 562873]
Build a (ruby) library that builds this required array and an (rspec) test that tests all the 4 scenarios described before.