Add new 'no-unnecessary-route-path-option' rule

README.md

@@ -96,6 +96,7 @@ The `--fix` option on the command line automatically fixes problems reported by
 | :white_check_mark::wrench: | [no-old-shims](./docs/rules/no-old-shims.md) | Prevents usage of old shims for modules |
 | :white_check_mark: | [no-on-calls-in-components](./docs/rules/no-on-calls-in-components.md) | Prevents usage of `on` to call lifecycle hooks in components |
 | :white_check_mark: | [no-restricted-resolver-tests](./docs/rules/no-restricted-resolver-tests.md) | Prevents the use of patterns that use the restricted resolver in tests. |
+|  | [no-unnecessary-route-path-option](./docs/rules/no-unnecessary-route-path-option.md) | Disallow unnecessary route `path` option |
 | :wrench: | [use-ember-get-and-set](./docs/rules/use-ember-get-and-set.md) | Enforces usage of Ember.get and Ember.set |
 
 

docs/rules/no-unnecessary-route-path-option.md

@@ -0,0 +1,32 @@
+## Disallow unnecessary route `path` option
+
+### Rule name: `no-unnecessary-route-path-option`
+
+When defining a route, it's not necessary to specify the `path` option if it matches the route name.
+
+### Rule Details
+
+Examples of **incorrect** code for this rule:
+
+```js
+this.route('blog-posts', { path: '/blog-posts' });
+```
+
+Examples of **correct** code for this rule:
+
+```js
+this.route('blog-posts');
+```
+
+```js
+this.route('blog-posts', { path: '/blog' });
+```
+
+### References
+
+* [Ember Routing Guide](https://guides.emberjs.com/release/routing/)
+
+### Related Rules
+
+* [no-capital-letters-in-routes](no-capital-letters-in-routes.md)
+* [routes-segments-snake-case](routes-segments-snake-case.md)

lib/index.js

@@ -32,6 +32,7 @@ module.exports = {
     'no-side-effects': require('./rules/no-side-effects'),
     'no-test-and-then': require('./rules/no-test-and-then'),
     'no-test-import-export': require('./rules/no-test-import-export'),
+    'no-unnecessary-route-path-option': require('./rules/no-unnecessary-route-path-option'),
     'order-in-components': require('./rules/order-in-components'),
     'order-in-controllers': require('./rules/order-in-controllers'),
     'order-in-models': require('./rules/order-in-models'),

lib/recommended-rules.js

@@ -34,6 +34,7 @@ module.exports = {
   "ember/no-side-effects": "error",
   "ember/no-test-and-then": "off",
   "ember/no-test-import-export": "off",
+  "ember/no-unnecessary-route-path-option": "off",
   "ember/order-in-components": "off",
   "ember/order-in-controllers": "off",
   "ember/order-in-models": "off",

lib/rules/no-unnecessary-route-path-option.js

@@ -0,0 +1,61 @@
+'use strict';
+
+const utils = require('../utils/utils');
+const ember = require('../utils/ember');
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+const ERROR_MESSAGE = 'Do not provide unnecessary `path` option which matches the route name.';
+
+module.exports = {
+  meta: {
+    docs: {
+      description: 'Disallow unnecessary route `path` option',
+      category: 'Best Practices',
+      recommended: false
+    },
+    fixable: null,
+    ERROR_MESSAGE
+  },
+
+  create(context) {
+    return {
+      CallExpression(node) {
+        if (!ember.isRoute(node)) {
+          return;
+        }
+
+        const hasExplicitPathOption = utils.isObjectExpression(node.arguments[1]) && hasPropertyWithKeyName(node.arguments[1], 'path');
+        if (!hasExplicitPathOption) {
+          return;
+        }
+
+        const pathOptionNode = getPropertyByKeyName(node.arguments[1], 'path');
+        const pathOptionValue = pathOptionNode.value.value;
+        const routeName = node.arguments[0].value;
+
+        if (pathMatchesRouteName(pathOptionValue, routeName)) {
+          context.report({
+            node: pathOptionNode,
+            message: ERROR_MESSAGE
+          });
+        }
+      }
+    };
+  }
+};
+
+function hasPropertyWithKeyName(objectExpression, keyName) {
+  return getPropertyByKeyName(objectExpression, keyName) !== undefined;
+}
+
+function getPropertyByKeyName(objectExpression, keyName) {
+  return objectExpression.properties.find(property => property.key.name === keyName);
+}
+
+function pathMatchesRouteName(path, routeName) {
+  const pathWithoutOptionalLeadingSlash = path.substring(0, 1) === '/' ? path.substring(1) : path;
+  return pathWithoutOptionalLeadingSlash === routeName;
+}

tests/lib/rules/no-unnecessary-route-path-option.js

@@ -0,0 +1,67 @@
+//------------------------------------------------------------------------------
+// Requirements
+//------------------------------------------------------------------------------
+
+const rule = require('../../../lib/rules/no-unnecessary-route-path-option');
+const RuleTester = require('eslint').RuleTester;
+
+const { ERROR_MESSAGE } = rule;
+
+//------------------------------------------------------------------------------
+// Tests
+//------------------------------------------------------------------------------
+
+const ruleTester = new RuleTester();
+ruleTester.run('no-unnecessary-route-path-option', rule, {
+  valid: [
+    'this.route("blog");',
+    'this.route("blog", function() {});',
+    'this.route("blog", { path: "/" });',
+    'this.route("blog", { path: "blog-posts" });',
+    'this.route("blog", { path: "blog-posts" }, function() {});',
+    'this.route("blog", { path: "/blog-posts" });',
+    'this.route("blog", { path: "blog-posts", otherOption: true });',
+
+    // With dynamic segment:
+    'this.route("blog", { path: ":blog" });',
+    'this.route("blog", { path: "/:blog" });',
+    'this.route("blog", { path: "blog/:blog_id" });',
+
+    // With wildcard segment:
+    'this.route("blog", { path: "*blog" });',
+    'this.route("blog", { path: "/*blog" });',
+    'this.route("blog", { path: "blog/*blog" });',
+
+    // Not Ember's route function:
+    'test();',
+    "test('blog');",
+    "test('blog', { path: 'blog' });",
+    "test('blog', { path: '/blog' });",
+    "this.test('blog');",
+    "this.test('blog', { path: 'blog' });",
+    "this.test('blog', { path: '/blog' });",
+    "MyClass.route('blog');",
+    "MyClass.route('blog', { path: 'blog' });",
+    "MyClass.route('blog', { path: '/blog' });",
+    "route.unrelatedFunction('blog', { path: 'blog' });",
+    "this.route.unrelatedFunction('blog', { path: 'blog' });"
+  ],
+  invalid: [
+    {
+      code: 'this.route("blog", { path: "blog" });',
+      errors: [{ message: ERROR_MESSAGE, type: 'Property' }]
+    },
+    {
+      code: 'this.route("blog", { path: "blog" }, function() {});',
+      errors: [{ message: ERROR_MESSAGE, type: 'Property' }]
+    },
+    {
+      code: 'this.route("blog", { path: "/blog" });',
+      errors: [{ message: ERROR_MESSAGE, type: 'Property' }]
+    },
+    {
+      code: 'this.route("blog", { path: "/blog", otherOption: true });',
+      errors: [{ message: ERROR_MESSAGE, type: 'Property' }]
+    }
+  ]
+});