{"id":1166,"date":"2022-11-13T20:27:04","date_gmt":"2022-11-13T19:27:04","guid":{"rendered":"https:\/\/www.netexpertise.eu\/fr\/?p=1166"},"modified":"2022-11-13T20:27:06","modified_gmt":"2022-11-13T19:27:06","slug":"convertir-une-map-de-maps-en-map-unique","status":"publish","type":"post","link":"http:\/\/www.netexpertise.eu\/fr\/devops\/terraform\/convertir-une-map-de-maps-en-map-unique.html","title":{"rendered":"Convertir une Map de Maps en Map Unique"},"content":{"rendered":"\n

..Ou comment \u00e9viter le message d’erreur ‘Call to function \u00ab\u00a0merge\u00a0\u00bb failed: arguments must be maps or objects, got \u00ab\u00a0tuple\u00a0\u00bb.’<\/em>. L’exemple avec une map de maps.

<\/p>\n\n\n\n

\"\"\/<\/figure>\n\n\n\n


Probl\u00e8me \u00e0 la Cr\u00e9ation d’une Map<\/h2>\n\n\n\n

Voici une structure de donn\u00e9es typique \u00e0 2 niveaux avec des sous-groupes qui contiennent des utilisateurs, eux-m\u00eames appartenant \u00e0 des d\u00e9partements:<\/p>\n\n\n\n

locals {\n   groups = {\n      it = {\n         admin   = [\"it1\",\"it2\"]\n         editors = [\"it3\",\"it4\"]\n      },\n      accounts = {\n         editors = [\"account1\",\"account2\"]\n         viewers = [\"account3\",\"account4\"]\n      }\n   }\n}<\/code><\/pre>\n\n\n\n

La structure devra \u00eatre nivel\u00e9e (flatten) dans de nombreux cas pour cr\u00e9er des resources Terraform<\/a>.
Notre cible est une map de sous-groupes uniques departement_sous-group = [ \u00ab\u00a0user1\u00a0\u00bb, \u00ab\u00a0user2\u00a0\u00bb ]. Dans notre exemple:<\/p>\n\n\n\n
subgroups = {\n  \"accounts_editors\" = [\n    \"account1\",\n    \"account2\",\n  ]\n  \"accounts_viewers\" = [\n    \"account3\",\n    \"account4\",\n  ]\n  \"it_admin\" = [\n    \"it1\",\n    \"it2\",\n  ]\n  \"it_editors\" = [\n    \"it3\",\n    \"it4\",\n  ]\n}<\/code><\/pre>\n\n\n\n

C’est assez simple d’obtenir une liste de maps distinctes en nivelant les listes r\u00e9sultantes d’une double boucle:<\/p>\n\n\n\n
subgroups = flatten([\n   for group,subgroups in local.groups : [\n      for subgroup, users in subgroups : {\n         \"${group}_${subgroup}\" = users\n      }\n   ]\n])\n# output:\nsubgroups = [\n  {\n    \"accounts_editors\" = [\n      \"account1\",\n      \"account2\",\n    ]\n  },\n  {\n    \"accounts_viewers\" = [\n      \"account3\",\n      \"account4\",\n    ]\n  },\n  {\n    \"it_admin\" = [\n      \"it1\",\n      \"it2\",\n    ]\n  },\n  {\n    \"it_editors\" = [\n      \"it3\",\n      \"it4\",\n    ]\n  },\n]<\/code><\/pre>\n\n\n\n
Tout ce qu’il nous reste \u00e0 faire est de fusionner ces maps en une map unique, mais ce faisant, le message d’erreur nous est retourn\u00e9:
‘Call to function \u00ab\u00a0merge\u00a0\u00bb failed: arguments must be maps or objects, got \u00ab\u00a0tuple\u00a0\u00bb.’<\/em>

<\/p>\n\n\n\n
\"Call
Call to function \u00ab\u00a0merge\u00a0\u00bb failed: arguments must be maps or objects, got \u00ab\u00a0tuple\u00a0\u00bb<\/em><\/figcaption><\/figure>\n\n\n\n

2 recours possibles: le moche et l’\u00e9l\u00e9gant.<\/p>\n\n\n\n

La Solution Moche : Une Autre Boucle Terraform<\/h2>\n\n\n\n

La 1re solution qui vient \u00e0 l’esprit est de g\u00e9n\u00e9rer la nouvelle map via une autre boucle for<\/a>. Cela nous am\u00e8ne \u00e0 3 boucles, et ne semble pas tr\u00e8s logique alors qu’un simple merge ferait le travail. Chaque map contient un \u00e9l\u00e9ment seulement, donc nous prenons les 1res cl\u00e9 et valeur.<\/p>\n\n\n\n
subgroups = { for subgroup in flatten([\n   for group,subgroups in local.groups : [\n      for subgroup, users in subgroups : {\n         \"${group}_${subgroup}\" = users\n      }\n   ]\n]) : keys(subgroup)[0] => values(subgroup)[0] }<\/code><\/pre>\n\n\n\n

La Solution El\u00e9gante : la Fonction Expansion<\/h2>\n\n\n\n

C’est beaucoup plus court que la solution pr\u00e9c\u00e9dente:<\/p>\n\n\n\n
subgroups = merge(flatten([\n   for group,subgroups in local.groups : [\n      for subgroup, users in subgroups : {\n         \"${group}_${subgroup}\" = users\n      }\n   ]\n])...)<\/code><\/pre>\n\n\n\n
Le r\u00e9sultat est exactement le m\u00eame mais qu’est-ce qui a chang\u00e9? Juste les 3 points…
La fonction Expansion<\/a> prend chaque \u00e9l\u00e9ment d’une liste et led passe \u00e0 la fonction appelante.
<\/p>\n\n\n\n

<\/p>\n","protected":false},"excerpt":{"rendered":"
..Ou comment \u00e9viter le message d’erreur ‘Call to function \u00ab\u00a0merge\u00a0\u00bb failed: arguments must be maps or objects, got \u00ab\u00a0tuple\u00a0\u00bb.’. L’exemple avec une map de maps. Probl\u00e8me \u00e0 la Cr\u00e9ation d’une Map Voici une structure de donn\u00e9es typique \u00e0 2 niveaux avec des sous-groupes qui contiennent des utilisateurs, eux-m\u00eames appartenant \u00e0 des d\u00e9partements: La structure devra […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[440,468],"tags":[],"yoast_head":"\nNetexpertise - Convertir une Map de Maps en Map Unique<\/title>\n<meta name=\"description\" content=\"Construire une map unique Terraform \u00e0 partir d'une map multi-niveau avec des boucles for et la fonction merge + expansion\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.netexpertise.eu\/fr\/devops\/terraform\/convertir-une-map-de-maps-en-map-unique.html\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Netexpertise - 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