feat: provide more details in "Missing parameters" error [router5/rou…

…ter5#208]
troch · Nov 7, 2017 · b562e5c · b562e5c
1 parent 3801711
commit b562e5c
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Showing 2 changed files with 5 additions and 2 deletions.
diff --git a/modules/Path.js b/modules/Path.js
@@ -260,7 +260,10 @@ export default class Path {
         );
 
         // Check all params are provided (not search parameters which are optional)
-        if (this.urlParams.some(p => !exists(encodedParams[p]))) throw new Error('Missing parameters');
+        if (this.urlParams.some(p => !exists(encodedParams[p]))) {
+            const missingParameters = this.urlParams.filter(p => !exists(encodedParams[p]));
+            throw new Error('Cannot build path: \'' + this.path + '\' requires missing parameters { ' + missingParameters.join(', ') + ' }');
+        }
 
         // Check constraints
         if (!options.ignoreConstraints) {

diff --git a/test/main.js b/test/main.js
@@ -43,7 +43,7 @@ describe('Path', function () {
         path.build({ id: '123', id2: 'abc' }).should.equal('/users/profile/123-abc.html');
         (function () {
             path.build({ id: '123'});
-        }).should.throw('Missing parameters');
+        }).should.throw('Cannot build path: \'/users/profile/:id-:id2.html\' requires missing parameters { id2 }');
     });
 
     it('should match and build paths with query parameters', function () {