non-crud controller generator

lib/basic-controller-generator.js

@@ -0,0 +1,66 @@
+'use strict';
+
+const { decorate, metadata, param } = require('./helpers.js');
+const rest = require('@loopback/rest');
+const context = require('@loopback/context');
+
+module.exports = function (specifications, operations) {
+
+  const paths = Object.keys(specifications);
+  const controllerClasses = {};
+  const decorationProperties = [];
+
+  paths.forEach(path => {
+    const methods = Object.keys(specifications[path]);
+    methods.forEach(method => {
+      const decorationProperty = [path];
+      const specs = specifications[path][method];
+      const controllerName = specs['x-controller-name'];
+      const operationName = specs['x-operation-name'];
+
+      if (!(controllerName in controllerClasses)) {
+        // Create the basic class
+        controllerClasses[controllerName] = class {
+          constructor(req) {
+            this.req = req;
+          }
+        }
+      }
+
+      // Add the class methods dynamically
+      controllerClasses[controllerName].prototype[operationName] = operations[operationName];
+      decorationProperty.push(method);
+      decorationProperty.push(operationName);
+      decorationProperties.push(decorationProperty);
+    });
+  });
+
+  const controllerName = Object.keys(controllerClasses)[0];
+  let ControllerClass = controllerClasses[controllerName];
+
+  Object.defineProperty(ControllerClass, 'name', { writable: true });
+  ControllerClass.name = controllerName;
+  Object.defineProperty(ControllerClass, 'name', { writable: false });
+
+  decorationProperties.forEach(decorationProperty => {
+    const path = decorationProperty[0];
+    const method = decorationProperty[1];
+    const operation = decorationProperty[2];
+
+    decorate([
+      rest[method](path, {
+        responses: specifications[path][method].responses
+      }),
+      metadata('design:type', Function),
+      metadata('design:paramtypes', []),
+      metadata('design:returntype', Object)
+    ], ControllerClass.prototype, operation, null);
+  });
+
+  ControllerClass = decorate([
+      param(0, context.inject(rest.RestBindings.Http.REQUEST)),
+      metadata('design:paramtypes', [Object])
+  ], ControllerClass);
+
+  return ControllerClass;
+};

server/controllers/ping.controller.js

@@ -1,61 +1,149 @@
 'use strict';
 
-const { decorate, metadata, param } = require('../../lib/helpers.js');
-const rest = require("@loopback/rest");
-const context = require("@loopback/context");
+const generateBasicController = require('../../lib/basic-controller-generator.js');
 
-const PING_RESPONSE = {
-  description: 'Ping Response',
-  content: {
-    'application/json': {
-        schema: {
-          type: 'object',
-          properties: {
-            greeting: { type: 'string' },
-            date: { type: 'string' },
-            url: { type: 'string' },
-            headers: {
-              type: 'object',
-              properties: {
-                'Content-Type': { type: 'string' },
-              },
-            additionalProperties: true,
-          },
-        },
-      },
-    },
+const operations = {
+  ping: function ping() {
+    return {
+      greeting: 'Ping from LoopBack',
+      date: new Date(),
+      url: this.req.url,
+      headers: Object.assign({}, this.req.headers),
+    };
   },
-};
 
-class PingController {
-  constructor(req) {
-    this.req = req;
-  }
+  pang: function pang() {
+    return {
+      greeting: 'Pang from LoopBack',
+      date: new Date(),
+      url: this.req.url,
+      headers: Object.assign({}, this.req.headers),
+    };
+  },
 
-  ping() {
+  pong: function pong() {
     return {
-      greeting: 'Hello from LoopBack',
+      greeting: 'Pong from LoopBack',
       date: new Date(),
       url: this.req.url,
       headers: Object.assign({}, this.req.headers),
     };
   }
 };
 
-decorate([
-  rest.get('/ping', {
-    responses: {
-      '200': PING_RESPONSE,
+const specifications = {
+  '/ping': {
+    'get': {
+      'x-controller-name': 'PingController',
+      'x-operation-name': 'ping',
+      'responses': {
+        '200': {
+          'description': 'GET Ping Response',
+          'content': {
+            'application/json': {
+              'schema': {
+                'type': 'object',
+                'properties': {
+                  'greeting': {
+                    'type': 'string'
+                  },
+                  'date': {
+                    'type': 'string'
+                  },
+                  'url': {
+                    'type': 'string'
+                  },
+                  'headers': {
+                    'type': 'object',
+                    'properties': {
+                      'Content-Type': {
+                        'type': 'string'
+                      }
+                    },
+                    'additionalProperties': true
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
     },
-  }),
-  metadata("design:type", Function),
-  metadata("design:paramtypes", []),
-  metadata("design:returntype", Object)
-], PingController.prototype, "ping", null);
-
-PingController = decorate([
-    param(0, context.inject(rest.RestBindings.Http.REQUEST)),
-    metadata("design:paramtypes", [Object])
-], PingController);
+    'post': {
+      'x-controller-name': 'PingController',
+      'x-operation-name': 'pang',
+      'responses': {
+        '200': {
+          'description': 'POST Ping Response',
+          'content': {
+            'application/json': {
+              'schema': {
+                'type': 'object',
+                'properties': {
+                  'greeting': {
+                    'type': 'string'
+                  },
+                  'date': {
+                    'type': 'string'
+                  },
+                  'url': {
+                    'type': 'string'
+                  },
+                  'headers': {
+                    'type': 'object',
+                    'properties': {
+                      'Content-Type': {
+                        'type': 'string'
+                      }
+                    },
+                    'additionalProperties': true
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  },
+  '/pong': {
+    'get': {
+      'x-controller-name': 'PingController',
+      'x-operation-name': 'pong',
+      'responses': {
+        '200': {
+          'description': 'GET Ping Response',
+          'content': {
+            'application/json': {
+              'schema': {
+                'type': 'object',
+                'properties': {
+                  'greeting': {
+                    'type': 'string'
+                  },
+                  'date': {
+                    'type': 'string'
+                  },
+                  'url': {
+                    'type': 'string'
+                  },
+                  'headers': {
+                    'type': 'object',
+                    'properties': {
+                      'Content-Type': {
+                        'type': 'string'
+                      }
+                    },
+                    'additionalProperties': true
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+    },
+  }
+}
 
-exports.PingController = PingController;
+exports.PingPongController = generateBasicController(specifications, operations);