[Elm] Fix not sanitizing param name (#20171)

* Add failing example

* Sanitize param name

* Regenerate fixed sample

* Override toParamName instead

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/ElmClientCodegen.java

@@ -228,10 +228,23 @@ public class ElmClientCodegen extends DefaultCodegen implements CodegenConfig {
 
     @Override
     public String toVarName(String name) {
-        final String varName = camelize(name.replaceAll("[^a-zA-Z0-9_]", ""), LOWERCASE_FIRST_LETTER);
+        // Replace space with _ (underscore) so camelize works as expected
+        final String varName = camelize(name.replaceAll(" ", "_").replaceAll("[^a-zA-Z0-9_]", ""),
+                LOWERCASE_FIRST_LETTER);
         return isReservedWord(varName) ? escapeReservedWord(name) : varName;
     }
 
+    @Override
+    public String toParamName(String name) {
+        // obtain the name from parameterNameMapping directly if provided
+        if (parameterNameMapping.containsKey(name)) {
+            return parameterNameMapping.get(name);
+        }
+
+        // params should be lowerCamelCase
+        return toVarName(name);
+    }
+
     @Override
     public String toEnumVarName(String value, String datatype) {
         String camelized = camelize(value.replace(" ", "_").replace("(", "_").replace(")", "")); // TODO FIXME escape properly

modules/openapi-generator/src/main/resources/elm/formParamEncoder.mustache

@@ -1 +1 @@
-{{^required}}Maybe.map ({{/required}}{{#required}}Just <| {{/required}}{{^isFile}}Http.stringPart {{/isFile}}{{#isFile}}Http.filePart {{/isFile}}"{{paramName}}"{{#isBoolean}}(\val -> if val then "true" else "false"){{/isBoolean}}{{#isDateTime}}Api.Time.dateTimeToString{{/isDateTime}}{{#isDate}}Api.Time.dateToString{{/isDate}}{{#isInteger}}String.fromInt{{/isInteger}}{{#isLong}}String.fromInt{{/isLong}}{{#isNumber}}String.fromFloat{{/isNumber}}{{#isFloat}}String.fromFloat{{/isFloat}}{{#isDouble}}String.fromFloat{{/isDouble}}{{#allowableValues}}Api.Data.stringFrom{{#datatypeWithEnum}}{{datatypeWithEnum}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{dataType}}{{/datatypeWithEnum}}{{/allowableValues}}{{#isUuid}}Uuid.toString{{/isUuid}}{{^required}}){{/required}} {{paramName}}
+{{^required}}Maybe.map ({{/required}}{{#required}}Just <| {{/required}}{{^isFile}}Http.stringPart {{/isFile}}{{#isFile}}Http.filePart {{/isFile}}"{{baseName}}"{{#isBoolean}}(\val -> if val then "true" else "false"){{/isBoolean}}{{#isDateTime}}Api.Time.dateTimeToString{{/isDateTime}}{{#isDate}}Api.Time.dateToString{{/isDate}}{{#isInteger}}String.fromInt{{/isInteger}}{{#isLong}}String.fromInt{{/isLong}}{{#isNumber}}String.fromFloat{{/isNumber}}{{#isFloat}}String.fromFloat{{/isFloat}}{{#isDouble}}String.fromFloat{{/isDouble}}{{#allowableValues}}Api.Data.stringFrom{{#datatypeWithEnum}}{{datatypeWithEnum}}{{/datatypeWithEnum}}{{^datatypeWithEnum}}{{dataType}}{{/datatypeWithEnum}}{{/allowableValues}}{{#isUuid}}Uuid.toString{{/isUuid}}{{^required}}){{/required}} {{paramName}}

modules/openapi-generator/src/main/resources/elm/operation.mustache

@@ -56,7 +56,7 @@ import File exposing (File){{/includeFile}}
     Api.request
         "{{httpMethod}}"
         "{{path}}"
-        [{{#pathParams}} ( "{{paramName}}", {{>paramToString}} {{>paramName}} ){{#-last}} {{/-last}}{{^-last}},{{/-last}}{{/pathParams}}]
+        [{{#pathParams}} ( "{{baseName}}", {{>paramToString}} {{>paramName}} ){{#-last}} {{/-last}}{{^-last}},{{/-last}}{{/pathParams}}]
         [{{#queryParams}} ( "{{baseName}}", {{#required}}Just <| {{/required}}{{^required}}Maybe.map {{/required}}{{>paramToString}} {{>paramName}} ){{#-last}} {{/-last}}{{^-last}},{{/-last}}{{/queryParams}}]
         [{{#headerParams}} ( "{{baseName}}", {{#required}}Just <| {{/required}}{{^required}}Maybe.map {{/required}}{{>paramToString}} {{>paramName}} ){{#-last}} {{/-last}}{{^-last}},{{/-last}}{{/headerParams}}]
         {{#bodyParam}}

modules/openapi-generator/src/test/resources/3_0/elm.yaml

@@ -126,6 +126,29 @@ paths:
               schema:
                 type: string
                 format: uuid
+  /param-sanitize/{test id}:
+    post:
+      responses:
+        '405':
+          description: Invalid input
+      parameters:
+        - name: "query with spaces"
+          in: query
+          schema:
+            type: string
+        - name: "test id"
+          in: path
+          required: true
+          schema:
+            type: string
+      requestBody:
+        content:
+          application/x-www-form-urlencoded:
+            schema:
+              type: object
+              properties:
+                "name with spaces":
+                  type: string
 components:
   schemas:
     Absent:

samples/openapi3/client/elm/src/Api/Request/Default.elm

@@ -16,6 +16,7 @@
 module Api.Request.Default exposing
     ( headerPost, HeaderType(..), headerTypeVariants
     , maybeGet
+    , paramSanitizeTestIdPost
     , pathStringIntegerEnumerationGet, Enumeration(..), enumerationVariants
     , queryGet, Enum(..), enumVariants
     , securedPost
@@ -134,6 +135,18 @@ maybeGet =
         Api.Data.maybeDecoder
 
 
+paramSanitizeTestIdPost : String -> Maybe String -> Maybe String -> Api.Request ()
+paramSanitizeTestIdPost testId_path queryWithSpaces_query nameWithSpaces =
+    Api.request
+        "POST"
+        "/param-sanitize/{test id}"
+        [ ( "test id", identity testId_path ) ]
+        [ ( "query with spaces", Maybe.map identity queryWithSpaces_query ) ]
+        []
+        (Just <| Http.multipartBody <| List.filterMap identity [ Maybe.map (Http.stringPart "name with spaces") nameWithSpaces ])
+        (Json.Decode.succeed ())
+
+
 pathStringIntegerEnumerationGet : String -> Int -> Enumeration -> Api.Request ()
 pathStringIntegerEnumerationGet string_path integer_path enumeration_path =
     Api.request