René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Client generated code fails to build request","articleBody":"Hi, i'm trying to use generated client, but i'm getting this error:\n\n`error formatting 'request': unsupported type []gen_client.PaymentQueryRequestCurrencies`\n\nHere are my code and specs:\n\nopenapi spec:\n```\n      \"/some/path/foo/bar\": {\n            \"get\": {\n                \"tags\": [\n                    \"Payments\"\n                ],\n                \"summary\": \"search\",\n                \"operationId\": \"search\",\n                \"parameters\": [\n                    {\n                        \"name\": \"merchantId\",\n                        \"in\": \"query\",\n                        \"required\": true,\n                        \"schema\": {\n                            \"type\": \"string\"\n                        }\n                    },\n                    {\n                        \"name\": \"request\",\n                        \"in\": \"query\",\n                        \"required\": true,\n                        \"schema\": {\n                            \"$ref\": \"#/components/schemas/PaymentQueryRequest\"\n                        }\n                    }\n                ],\n                \"responses\": {\n                    \"200\": {\n...\n\n\n\"PaymentQueryRequest\": {\n                \"required\": [\n                    \"currencies\",\n                    ... (other params)\n                ],\n                \"type\": \"object\",\n                \"properties\": {\n                    ... (params definitions)\n                    \"currencies\": {\n                        \"type\": \"array\",\n                        \"description\": \"Array of ISO 3-letter currency, e.g. SEK,EUR,USD\",\n                        \"example\": \"SEK, EUR, USD\",\n                        \"items\": {\n                            \"type\": \"string\",\n                            \"description\": \"Array of ISO 3-letter currency, e.g. SEK,EUR,USD\",\n                            \"example\": \"SEK, EUR, USD\",\n                            \"enum\": [\n                                \"ADA\",\n                                (long currencies list)\n                                \"ZWL\"\n                            ]\n                        }\n                    },\n                    ... (params definitions)\n...\n```\n\nmy codegen settings:\n```\npackage: gen_client\noutput: gen/client/client.gen.go\ngenerate:\n  models: true\n  client: true\n```\n\nusing like this: `//go:generate go tool oapi-codegen -config ../../../openapi/codegen-client.yaml ../../../openapi/openapi.json`\n\ngo.mod\n```\n\tgithub.com/oapi-codegen/nethttp-middleware v1.1.2\n\tgithub.com/oapi-codegen/oapi-codegen/v2 v2.5.0\n\tgithub.com/oapi-codegen/runtime v1.1.2\n```\n\nclient code:\n\n```code:go\n\tresp, err := a.oapiClient.Search(ctx, &gen.SearchParams{\n\t\tMerchantId: a.MerchantID,\n\t\tRequest: gen.PaymentQueryRequest{\n\t\t\tId:            txID,\n\t\t\tCurrencies:    []gen.PaymentQueryRequestCurrencies{},\n\t\t\tInitiatedPsps: []gen.PaymentQueryRequestInitiatedPsps{},\n\t\t\tPsps:          []gen.PaymentQueryRequestPsps{},\n\t\t\tStates:        []gen.PaymentQueryRequestStates{},\n\t\t\tStatuses:      []gen.PaymentQueryRequestStatuses{},\n\t\t\tTxTypes:       []gen.PaymentQueryRequestTxTypes{},\n\t\t},\n\t})\n\tif err != nil {\n\t\treturn nil, fmt.Errorf(\"search tx: %w\", err)\n\t}\n```\ngenerated object PaymentQueryRequest\n```\ntype PaymentQueryRequest struct {\n        ... (other fields)\n\t// Currencies Array of ISO 3-letter currency, e.g. SEK,EUR,USD\n\tCurrencies []PaymentQueryRequestCurrencies `json:\"currencies\"`\n        ... (other fields)\n}\n```\nIsn't those fields supposed to have `form` tag? All fields in PaymentQueryRequest have only `json` tag\n\nalso I've tried with nils instead of empty slices – same error happens\n\n\n","author":{"url":"https://github.com/blokkskyver","@type":"Person","name":"blokkskyver"},"datePublished":"2025-10-21T10:15:57Z","url":"https://github.com/oapi-codegen/oapi-codegen/issues/2109"}