impl Page removing functions

lib/models/page.js

@@ -943,7 +943,13 @@ module.exports = function(crowi) {
   };
 
   /**
-   * remove the page that is redirecting to specified `pagePath`
+   * remove the page that is redirecting to specified `pagePath` recursively
+   *  ex: when
+   *    '/page1' redirects to '/page2' and
+   *    '/page2' redirects to '/page3'
+   *    and given '/page3',
+   *    '/page1' and '/page2' will be removed
+   *
    * @param {string} pagePath
    */
   pageSchema.statics.removeRedirectOriginPageByPath = function(pagePath) {
@@ -951,7 +957,12 @@ module.exports = function(crowi) {
 
     return Page.findPageByRedirectTo(pagePath)
       .then((redirectOriginPageData) => {
-        return Page.removePageById(redirectOriginPageData.id);
+        // remove
+        return Page.removePageById(redirectOriginPageData.id)
+          // remove recursive
+          .then(() => {
+            return Page.removeRedirectOriginPageByPath(redirectOriginPageData.path)
+          });
       })
       .catch((err) => {
         // do nothing if origin page doesn't exist