fix the two routes with the same path conflicts (#160)

lib/router.js

@@ -384,7 +384,8 @@ Router.prototype.routes = Router.prototype.middleware = function () {
       return next();
     }
 
-    const path = router.opts.routerPath || ctx.routerPath || ctx.path;
+    const path =
+      router.opts.routerPath || ctx.newRouterPath || ctx.path || ctx.routerPath;
     const matched = router.match(path, ctx.method);
     let layerChain;
 

package.json

@@ -1,7 +1,7 @@
 {
   "name": "@koa/router",
   "description": "Router middleware for koa. Maintained by Forward Email and Lad.",
-  "version": "12.0.0",
+  "version": "12.1.0",
   "author": "Alex Mingoia <talk@alexmingoia.com>",
   "bugs": {
     "url": "https://github.com/koajs/router/issues",

test/lib/router.js

@@ -918,7 +918,7 @@ describe('Router', function () {
     app.use(function (ctx, next) {
       // bind helloworld.example.com/users => example.com/helloworld/users
       const appname = ctx.request.hostname.split('.', 1)[0];
-      ctx.routerPath = '/' + appname + ctx.path;
+      ctx.newRouterPath = '/' + appname + ctx.path;
       return next();
     });
     app.use(router.routes());
@@ -957,6 +957,42 @@ describe('Router', function () {
       });
   });
 
+  it('two routes with the same path', function (done) {
+    const app = new Koa();
+    const router1 = new Router();
+    const router2 = new Router();
+    router1.get('/echo/:saying', function (ctx, next) {
+      try {
+        expect(ctx.params.saying).eql('helloWorld');
+        expect(ctx.request.params.saying).eql('helloWorld');
+        next();
+      } catch (err) {
+        ctx.status = 500;
+        ctx.body = err.message;
+      }
+    });
+    router2.get('/echo/:saying', function (ctx) {
+      try {
+        expect(ctx.params.saying).eql('helloWorld');
+        expect(ctx.request.params.saying).eql('helloWorld');
+        ctx.body = { echo: ctx.params.saying };
+      } catch (err) {
+        ctx.status = 500;
+        ctx.body = err.message;
+      }
+    });
+    app.use(router1.routes());
+    app.use(router2.routes());
+    request(http.createServer(app.callback()))
+      .get('/echo/helloWorld')
+      .expect(200)
+      .end(function (err, res) {
+        if (err) return done(err);
+        expect(res.body).to.eql({ echo: 'helloWorld' });
+        done();
+      });
+  });
+
   it('parameter added to request in ctx with sub router', function (done) {
     const app = new Koa();
     const router = new Router();