ktor-client add toString() for generic params (#14717)

* ktor-client add toString() for generic params

* fix builder receivers

Author: Rattenkrieg

modules/openapi-generator/src/main/resources/kotlin-client/libraries/jvm-ktor/api.mustache

@@ -51,14 +51,58 @@ import com.fasterxml.jackson.databind.ObjectMapper
                 {{#isMultipart}}
                         formData {
                     {{#formParams}}
+                        {{#isFile}}
                         {{{paramName}}}?.apply { append("{{{baseName}}}", {{{paramName}}}) }
+                        {{/isFile}}
+                        {{^isFile}}
+                        {{^isArray}}
+                        {{^isString}}
+                        {{^isNumber}}
+                        {{{paramName}}}?.apply { append("{{{baseName}}}", {{{paramName}}}.toString()) }
+                        {{/isNumber}}
+                        {{#isNumber}}
+                        {{{paramName}}}?.apply { append("{{{baseName}}}", {{{paramName}}}) }
+                        {{/isNumber}}
+                        {{/isString}}
+                        {{#isString}}
+                        {{{paramName}}}?.apply { append("{{{baseName}}}", {{{paramName}}}) }
+                        {{/isString}}
+                        {{/isArray}}
+                        {{#isArray}}
+                        for (int i=0; i < {{paramName}}.size(); i++) {
+                            {{{paramName}}}?.apply { append("{{{baseName}}}", {{{paramName}}}.get(i).toString()) }
+                        }
+                        {{/isArray}}
+                        {{/isFile}}
                     {{/formParams}}
                         }
                 {{/isMultipart}}
                 {{^isMultipart}}
                         ParametersBuilder().also {
                     {{#formParams}}
+                        {{#isFile}}
+                        {{{paramName}}}?.apply { it.append("{{{baseName}}}", {{{paramName}}}) }
+                        {{/isFile}}
+                        {{^isFile}}
+                        {{^isArray}}
+                        {{^isString}}
+                        {{^isNumber}}
                         {{{paramName}}}?.apply { it.append("{{{baseName}}}", {{{paramName}}}.toString()) }
+                        {{/isNumber}}
+                        {{#isNumber}}
+                        {{{paramName}}}?.apply { it.append("{{{baseName}}}", {{{paramName}}}) }
+                        {{/isNumber}}
+                        {{/isString}}
+                        {{#isString}}
+                        {{{paramName}}}?.apply { it.append("{{{baseName}}}", {{{paramName}}}) }
+                        {{/isString}}
+                        {{/isArray}}
+                        {{#isArray}}
+                        for (int i=0; i < {{paramName}}.size(); i++) {
+                            {{{paramName}}}?.apply { it.append("{{{baseName}}}", {{{paramName}}}.get(i).toString()) }
+                        }
+                        {{/isArray}}
+                        {{/isFile}}
                     {{/formParams}}
                         }.build()
                 {{/isMultipart}}

samples/client/petstore/kotlin-jvm-ktor-gson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt

@@ -245,8 +245,8 @@ import java.text.DateFormat
 
             val localVariableBody = 
                         ParametersBuilder().also {
-                        name?.apply { it.append("name", name.toString()) }
-                        status?.apply { it.append("status", status.toString()) }
+                        name?.apply { it.append("name", name) }
+                        status?.apply { it.append("status", status) }
                         }.build()
 
             val localVariableQuery = mutableMapOf<String, List<String>>()

samples/client/petstore/kotlin-jvm-ktor-jackson/src/main/kotlin/org/openapitools/client/apis/PetApi.kt

@@ -243,8 +243,8 @@ import com.fasterxml.jackson.databind.ObjectMapper
 
             val localVariableBody = 
                         ParametersBuilder().also {
-                        name?.apply { it.append("name", name.toString()) }
-                        status?.apply { it.append("status", status.toString()) }
+                        name?.apply { it.append("name", name) }
+                        status?.apply { it.append("status", status) }
                         }.build()
 
             val localVariableQuery = mutableMapOf<String, List<String>>()