allOf merging fixes (fixes #31)

lib/components/JsonSchema/json-schema.js

@@ -73,6 +73,7 @@ export default class JsonSchema extends BaseComponent {
     let props = Object.keys(schema.properties).map((prop, idx) => {
       let propData = schema.properties[prop];
       let propPointer = JsonPointer.join(this.pointer, ['properties', prop]);
+      this.joinAllOf(propData);
       propData = JsonSchema.injectPropData(propData, prop, propPointer, this.requiredMap, schema);
       if (propData.isDiscriminator) discriminatorFieldIdx = idx;
       return propData;

lib/components/base.js

@@ -17,6 +17,21 @@ function safeConcat(a, b) {
   return res.concat(b);
 }
 
+function defaults(target, src) {
+  var props = Object.keys(src);
+
+  var index = -1,
+      length = props.length;
+
+  while (++index < length) {
+    var key = props[index];
+    if (target[key] === undefined) {
+      target[key] = src[key];
+    }
+  }
+  return target;
+}
+
 function snapshot(obj) {
   if(obj == null || typeof(obj) != 'object') {
     return obj;
@@ -158,34 +173,34 @@ export class BaseComponent {
   joinAllOf(schema = this.componentSchema, opts) {
     var self = this;
     function merge(into, schemas) {
-      if (into.required || into.properties) {
-        let errMessage = `Can\'t merge allOf: properties or required fields are specified on the same level as allOf
-          ${into}`;
-        throw new Error(errMessage);
-      }
-      into.required = [];
-      into.properties = {};
       for (let subSchema of schemas) {
         if (opts && opts.omitParent && subSchema.discriminator) continue;
-
         // TODO: add support for merge array schemas
-        if (typeof subSchema !== 'object' || subSchema.type !== 'object') {
+        if (typeof subSchema !== 'object') {
-          let errMessage = `Can\'t merge allOf: only subschemas with type: object can be merged
+          let errMessage = `Items of allOf should be Object: ${typeof subSchema} found
             ${subSchema}`;
           throw new Error(errMessage);
         }
 
         self.joinAllOf(subSchema);
 
+        if (into.type && into.type !== subSchema.type) {
+          let errMessage = `allOf merging error: schemas with different types can't be merged`;
+          throw new Error(errMessage);
+        }
+
         // TODO: add check if can be merged correctly (no different properties with the same name)
-        if (subSchema.properties) {
+        if (subSchema.type === 'object' && subSchema.properties) {
+          into.properties || (into.properties = {});
           Object.assign(into.properties, subSchema.properties);
         }
-        if (subSchema.required) {
+        if (subSchema.type === 'object' && subSchema.required) {
+          into.required || (into.required = []);
           into.required.push(...subSchema.required);
         }
+
+        defaults(into, subSchema);
       }
-      into.type = 'object';
       into.allOf = null;
     }
     if (schema.allOf) {

lib/components/base.spec.js

@@ -217,15 +217,51 @@ describe('Redoc components', () => {
         });
       });
 
-      describe('Incorrect or not supported allOf', () => {
+      describe('AllOf with other properties on the allOf level', () => {
-        it('should throw when properties or required is set on the same level as allOf', () => {
+        let joined;
-          component.pointer = '/definitions/BadAllOf2';
+        beforeAll(() => {
+          component.pointer = '/definitions/AllOfWithOther';
           component.ngOnInit();
           component.dereference();
-          (() => component.joinAllOf()).should.throw();
+          component.joinAllOf();
+          joined = component.componentSchema;
         });
 
-        it('should throw when merging non-object schemas', () => {
+        it('should remove $allOf field', () => {
+          expect(joined.allOf).toBeNull();
+        });
+
+        it('should set type object', () => {
+          joined.type.should.be.equal('object');
+        });
+
+        it('should merge properties', () => {
+          Object.keys(joined.properties).length.should.be.equal(1);
+          Object.keys(joined.properties).should.be.deepEqual(['id']);
+        });
+
+        it('should merge required', () => {
+          joined.required.length.should.be.equal(1);
+          joined.required.should.be.deepEqual(['id']);
+        });
+
+        it('should preserve parent properties', () => {
+          joined.description.should.be.equal('Test');
+          joined.readOnly.should.be.equal(true);
+        });
+      });
+
+      describe('allOf edgecases', () => {
+        it('should merge properties and required when defined on allOf level', () => {
+          component.pointer = '/definitions/PropertiesOnAllOfLevel';
+          component.ngOnInit();
+          component.dereference();
+          (() => component.joinAllOf()).should.not.throw();
+          let joined = component.componentSchema;
+          Object.keys(joined.properties).length.should.be.equal(3);
+        });
+
+        it('should throw when merging schemas with different types', () => {
           component.pointer = '/definitions/BadAllOf1';
           component.ngOnInit();
           component.dereference();

tests/schemas/base-component-joinallof.json

@@ -8,6 +8,7 @@
   "basePath": "/v2/",
   "definitions": {
     "Simple": {
+      "description": "simple",
       "type": "object",
       "required": ["id"],
       "properties": {
@@ -57,6 +58,15 @@
         }
       ]
     },
+    "AllOfWithOther": {
+      "description": "Test",
+      "readOnly": true,
+      "allOf": [
+        {
+          "$ref": "#/definitions/Simple"
+        }
+      ]
+    },
     "BadAllOf1": {
       "allOf": [
         {
@@ -67,8 +77,12 @@
         }
       ]
     },
-    "BadAllOf2": {
+    "PropertiesOnAllOfLevel": {
-      "properties": {},
+      "properties": {
+        "prop": {
+          "type": "string"
+        }
+      },
       "allOf": [
         {
           "$ref": "#/definitions/Simple"