[Travel Feed] Unable to broadcast if permlink was used in a previous post

Project Information

Repository: https://github.com/travelfeed-io/travelfeed-io/
Project Name: Travel Feed

Describe the bug

If a user attempts to create a post with the same title and therefore the same permlink as a post they previously created by the post cannot be submitted due to broadcast errors.

To Reproduce

Steps to reproduce the behavior:

1. Go to the create post within travel feed.
2. Enter a title that you have used previously on another post (the post should not have the parent_permlink of "travelfeed", therefore it should have been created on another front end.
3. Enter any post body that meets the validation of 250 words.
4. Publish the post
5. Note that the post cannot be created.

Expected behavior
When a user creates that has the same title that was previously used on another post, the permlink that is created from the title should be adjusted to make it unique, a check should me made to identify if the permlink that is attempting to be submitted is valid to be used.

Error in Console

error: "server_error"
error_description: "equal( com.parent_permlink, o.parent_permlink ): The permlink of a comment cannot change."

Request Payload

{
   "operations":[
      [
         "comment",
         {
            "parent_author":"",
            "parent_permlink":"travelfeed",
            "author":"votezilla",
            "permlink":"test",
            "title":"Test",
            "body":"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Aliquam sed arcu interdum, luctus augue eget, rhoncus turpis. Etiam id erat non metus mattis pellentesque nec non ante. Nunc eu tristique risus, eget consequat turpis. Cras iaculis sodales justo consequat faucibus. Etiam suscipit vitae risus et gravida.",
            "json_metadata":"{\"tags\":[\"travelfeed\"],\"app\":\"travelfeed/1.0.0\",\"community\":\"travelfeed\",\"image\":[],\"links\":[],\"users\":[]}"
         }
      ]
   ]
}

Note: The permlink of "test" as mentioned in the payload was previously used on another post

Solution

Prior to the broadcast add a middleware that checks that if a user a permalink exists, in the event that it does exist, a random string could be appended to the post to make it unique. In the event, it doesn't exist no change is required.

Environment

• Browser: Google Chrome (Version 75.0.3770.100 (Official Build) (64-bit))
• Device: MacBook Pro (Retina, 15-inch, Late 2013)
• Operating system: MacOS Mojave Version 10.14.4

Note: In a further investigation by the project owner, issues also arise when you attempt to edit a post that has the same parent_permlink of "travelfeed" and instead of creating a new post, it instead edits the previously created post that shares the same parent_permlink and permlink.

GitHub Account
A link to my GitHub account can be found here:

https://github.com/tobias-g1

A link to the issue reported on GitHub can be found here:

https://github.com/travelfeed-io/travelfeed-io/issues/114