Import inner items for map (#3123)

fix #3094

Author: Zomzog

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

@@ -4660,9 +4660,17 @@ public CodegenParameter fromRequestBody(RequestBody body, Set<String> imports, S
                 schema.setAdditionalProperties(inner);
             }
             CodegenProperty codegenProperty = fromProperty("property", schema);
-            // only support 1-dimension map only
+
             imports.add(codegenProperty.baseType);
 
+            CodegenProperty innerCp = codegenProperty;
+            while (innerCp != null) {
+                if (innerCp.complexType != null) {
+                    imports.add(innerCp.complexType);
+                }
+                innerCp = innerCp.items;
+            }
+
             if (StringUtils.isEmpty(bodyParameterName)) {
                 codegenParameter.baseName = "request_body";
             } else {

modules/openapi-generator/src/test/java/org/openapitools/codegen/DefaultCodegenTest.java

@@ -17,6 +17,7 @@
 
 package org.openapitools.codegen;
 
+import com.google.common.collect.Sets;
 import io.swagger.v3.oas.models.Components;
 import io.swagger.v3.oas.models.OpenAPI;
 import io.swagger.v3.oas.models.Operation;
@@ -638,4 +639,19 @@ public void objectQueryParamIdentifyAsObject() {
         Assert.assertEquals(imports.iterator().next(), "PageQuery");
     }
 
+    @Test
+    public void mapParamImportInnerObject() {
+        final OpenAPI openAPI = TestUtils.parseSpec("src/test/resources/2_0/mapArgs.yaml");
+        final DefaultCodegen codegen = new DefaultCodegen();
+        codegen.setOpenAPI(openAPI);
+
+        RequestBody requestBody = openAPI.getPaths().get("/api/instruments").getPost().getRequestBody();
+
+        HashSet<String> imports = new HashSet<>();
+        codegen.fromRequestBody(requestBody, imports, "");
+
+        HashSet<String> expected = Sets.newHashSet("InstrumentDefinition", "map");
+
+        Assert.assertEquals(imports, expected);
+    }
 }