[fixed] Added support for building URLs with optional parameters

modules/components/Routes.js

@@ -32,7 +32,7 @@ function findMatches(path, routes, defaultRoute, notFoundRoute) {
 
     if (matches != null) {
       var rootParams = getRootMatch(matches).params;
-      
+
       params = route.props.paramNames.reduce(function (params, paramName) {
         params[paramName] = rootParams[paramName];
         return params;

modules/utils/Path.js

@@ -15,7 +15,8 @@ function encodeURLPath(path) {
 }
 
 var paramCompileMatcher = /:([a-zA-Z_$][a-zA-Z0-9_$]*)|[*.()\[\]\\+|{}^$]/g;
-var paramInjectMatcher = /:([a-zA-Z_$][a-zA-Z0-9_$]*)|[*]/g;
+var paramInjectMatcher = /:([a-zA-Z_$][a-zA-Z0-9_$?]*[?]?)|[*]/g;
+var paramInjectTrailingSlashMatcher = /\/\/\?|\/\?/g;
 var queryMatcher = /\?(.+)/;
 
 var _compiledPatterns = {};
@@ -86,10 +87,18 @@ var Path = {
     return pattern.replace(paramInjectMatcher, function (match, paramName) {
       paramName = paramName || 'splat';
 
-      invariant(
-        params[paramName] != null,
-        'Missing "' + paramName + '" parameter for path "' + pattern + '"'
-      );
+      // If param is optional don't check for existence
+      if (paramName.slice(-1) !== '?') {
+        invariant(
+          params[paramName] != null,
+          'Missing "' + paramName + '" parameter for path "' + pattern + '"'
+        );
+      } else {
+        paramName = paramName.slice(0, -1)
+        if (params[paramName] == null) {
+            return '';
+        }
+      }
 
       var segment;
       if (paramName === 'splat' && Array.isArray(params[paramName])) {
@@ -104,7 +113,7 @@ var Path = {
       }
 
       return encodeURLPath(segment);
-    });
+    }).replace(paramInjectTrailingSlashMatcher, '/');
   },
 
   /**

modules/utils/__tests__/Path-test.js

@@ -47,6 +47,34 @@ describe('Path.extractParams', function () {
       });
     });
 
+    describe('and the pattern is optional', function () {
+      var pattern = 'comments/:id?/edit'
+
+      describe('and the path matches with supplied param', function () {
+        it('returns an object with the params', function () {
+          expect(Path.extractParams(pattern, 'comments/123/edit')).toEqual({ id: '123' });
+        });
+      });
+      describe('and the path matches without supplied param', function () {
+        it('returns an object with param set to null', function () {
+          expect(Path.extractParams(pattern, 'comments//edit')).toEqual({id: null});
+        });
+      });
+    });
+    describe('and the pattern and forward slash are optional', function () {
+      var pattern = 'comments/:id?/?edit'
+
+      describe('and the path matches with supplied param', function () {
+        it('returns an object with the params', function () {
+          expect(Path.extractParams(pattern, 'comments/123/edit')).toEqual({ id: '123' });
+        });
+      });
+      describe('and the path matches without supplied param', function () {
+        it('returns an object with param set to null', function () {
+          expect(Path.extractParams(pattern, 'comments/edit')).toEqual({id: null});
+        });
+      });
+    });
     describe('and the path does not match', function () {
       it('returns null', function () {
         expect(Path.extractParams(pattern, 'users/123')).toBe(null);
@@ -166,6 +194,30 @@ describe('Path.injectParams', function () {
       });
     });
 
+    describe('and a param is optional', function () {
+      var pattern = 'comments/:id?/edit';
+
+      it('returns the correct path when param is supplied', function () {
+        expect(Path.injectParams(pattern, {id:'123'})).toEqual('comments/123/edit');
+      });
+
+      it('returns the correct path when param is not supplied', function () {
+        expect(Path.injectParams(pattern, {})).toEqual('comments//edit');
+      });
+    });
+
+    describe('and a param and forward slash are optional', function () {
+      var pattern = 'comments/:id?/?edit';
+
+      it('returns the correct path when param is supplied', function () {
+        expect(Path.injectParams(pattern, {id:'123'})).toEqual('comments/123/edit');
+      });
+
+      it('returns the correct path when param is not supplied', function () {
+        expect(Path.injectParams(pattern, {})).toEqual('comments/edit');
+      });
+    });
+
     describe('and all params are present', function () {
       it('returns the correct path', function () {
         expect(Path.injectParams(pattern, { id: 'abc' })).toEqual('comments/abc/edit');