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QUESTION
I'm a student learning about database design and currently learning about the relationships of - one-to-one, one-to-many, many-to-many. I understand the concept well enough, but feel like I'm lacking experience/information on how it would be implemented in a real production scenario.
My question is this
If I have a blog website with a Blog Post as an entity and comments for each blog post, how would you handle the comments in the database?`
Would you use a one-to-many relationship and just store all the comments in a single table. Then link those comments to each blog post and user who created it?
What if each comment had a sub-comment? Would you create a separate table for sub-comments and link it to a single comment? Would that cause too much overhead and confusion within the DB itself?
I get the concepts and all, but don't understand best practices for handling what seems like basic stuff.
Thanks in advance!
...ANSWER
Answered 2021-Jun-15 at 16:06The simplest solution is to stick with a one-to-many relationship. Use one table and store one comment per row, with references to the post and the comment author, and a timestamp so you can sort the comments chronologically.
You seem uncertain about whether you need a "threaded comment" hierarchy. This is more complex, so if you don't need it, don't bother.
If you do need to show comment threads, then you should learn about running recursive queries in MySQL 8.0: https://dev.mysql.com/doc/refman/8.0/en/with.html#common-table-expressions-recursive
You still only need one table. Don't create a second table for sub-comments. Just store comments like in your one-to-many example, but each comment may link to its "parent" comment when it is a reply.
Another solution that many sites use is to skip implementing their own comment system, and just embed a comment service like Disqus. That's likely to be much more reliable and safe than yours. But if you're doing this as a learning exercise, that's worthwhile too.
QUESTION
I have a pair of iterator, and I would like to use ranges::views::filter(some_predicate)
on it (with the pipe operator). AFAIU I should first convert my pair of iterator into a view. I tried to use ranges::subrange(first, last)
to do so, but I’m getting horrible error messages.
Note1: I’m using C++14 and range-v3 version 0.9.1 (the last version compatible with gcc-5.5). If the solution differs when using C++17/20 and/or when using C++20 std::ranges, I’m also interested to know what changed.
Note2: I find the documentation of range-v3 severely lacking, so I’m using cppreference.com. If you know a better documentation, I’m very interested.
EDIT:
In my real code, I’m wrapping a java-style legacy iterator (that has a next()
method instead of operator++
/operator*
. I’m wrapping them in a C++-compatible wrapper. Then I tried to convert that wrapper into a view, and finally filter it. I reproduce a minimal example on godbolt. This use iterator_range
as suggested, but it still doesn’t compile (see the second edit below).
ANSWER
Answered 2021-Apr-08 at 16:24In ranges-v3, there is iterator_range
which you can use to wrap the iterators into a range object.
In C++20, you can use std::span
to wrap those iterators into an range object
QUESTION
When the Auto Scaling Group creates a new instances, the code from CodeDeploy is not downloaded and installed on a newly created EC2 instance.
I've followed the documentation here: https://docs.amazonaws.cn/en_us/codedeploy/latest/userguide/tutorials-auto-scaling-group-create-auto-scaling-group.html
And the last steps says
Install the CodeDeploy agent by following the steps in Install the CodeDeploy agent and using the Name=CodeDeployDemo instance tags.
My "user" script run on the new instance from the ASG (Auto Scaling Group) correctly installs and run the CodeDeploy agent (connecting to SSh to the machine and running a service codedeploy-agent status
shows its running), but from there, I don't know how to tell CodeDeploy to deploy the code to that instance. (Or to run CodePipeline for that instance?)
Could you help me point into the right direction on what to do here? I'm happy to provide any details that are lacking here if you need any!
Thank you!
...ANSWER
Answered 2021-Jun-15 at 04:54Based on the comments.
The issue of being stuck at:
Install the CodeDeploy agent by following the steps in Install the CodeDeploy agent and using the Name=CodeDeployDemo instance tags.
was simply resolved by skipping this step. It is not needed, as OP uses UserData
to setup CodeDeploy Agent.
QUESTION
new to python trying to create a program you can feed a .txt file and have the program perform a specific list of actions code below
...ANSWER
Answered 2021-Apr-16 at 04:30I think this will do what you want.
QUESTION
It is time we enabled the Continuous Integration of the build pipeline, so when I went to do just that, i am seeing something strange...
The trigger appears to be enabled? yet theres a message suggesting webhooks are missing to the repo and need to be restored. When i click restore, it fails!
...The remote repository’s webhooks are missing or incorrect.
ANSWER
Answered 2021-Jun-14 at 21:57After debugging the issue further with the developer, it appears the app password we created in bitbucket may not have had the "Webhooks" option enabled.
Unfortunately, we cannot edit app passwords in Bitbucket, which is a bad constraint but whatever. We ended up just creating a new app password, and enabled Webhooks permissions this time, then i updated the service connection with this new app password, and wala, it worked!
QUESTION
I am using this template in my overleaf Report:
https://www.overleaf.com/project/60c75f5e234ec24080f0ea6a
If link is not accesible here is the code:
...ANSWER
Answered 2021-Jun-14 at 21:22The problem is that your document class already selects a bibliography style, which you can't change afterwards. Two workarounds:
use the style your document class sets by removing
\bibliographystyle{IEEEannot}
from your codeif you actually do need the other style, save
olplainarticle.cls
under a new name and change l.8\ProvidesClass{olplainarticle}[06/12/2015, v1.0]
to the new name, remove line 43/44\RequirePackage{natbib} \bibliographystyle{apalike}
from the new .cls file and then change\documentclass{olplainarticle}
to the new name
QUESTION
I am writing code for a custom SAP program regarding some Vendor information. In my program flow, there is a possibility of me trying to use a Vendor VAT Number that belongs to an unknown Vendor. There is a Web site (EU Based - https://ec.europa.eu/taxation_customs/vies/) for such purposes that requires a country key and the specified VAT Number in order for it to provide an answer with the available Company information (only works for company VAT numbers of course). My problem is that I cannot seem to find any way to pass those parameters dynamically to the Web site without needing the user to interfere during this process. Manually, the process would be to select a country key, type in a VAT number and press 'Verify'.
Is there any way for me to call this specific Web site URL and "bypass" this process to only display the result page? For now, I'm using the following Function Module to just call the specified URL, in lack of any better choices.
...ANSWER
Answered 2021-Jun-14 at 10:21You can use CL_HTTP_CLIENT class or HTTP_POST/HTPP_GET FM.
You need to install given web page SSL root certificate to your system with STRUST t-code.
Example usage of CL_HTTP_CLIENT below.
QUESTION
I use Flutter with Android Studio on a Mac.
One day (today), I ran "flutter doctor" from the command line.
It stated that my "cocoapods" was not good enough.
...ANSWER
Answered 2021-Mar-12 at 04:49You could try:
QUESTION
I came across a org.hibernate.LazyInitializationException
which the cause is very well explained in this question. My code has, I think, the same problem as in the question referenced in the link. Here's the code:
Contract class:
...ANSWER
Answered 2021-Jun-14 at 11:51This is happening because there is no Transaction opened in DTO(object become detached). Wherever you have fetched the object from the DB call contractFile.getContract()
so that the ORM framework loads the lazy-loaded object.
QUESTION
I'm trying to set up different Xmonad key mappings depending on the number of connected monitors. The reason is that I use the same Xmonad config file on multiple systems (desktops, a laptop with different monitor configurations including 3 displays). Displays are listed in a different order on different systems, that's why I need to hardcode display indices when using a 3 monitor setup.
My current best try is something like that (everything that is not relevant has been removed):
...ANSWER
Answered 2021-Jun-14 at 10:51not too familiar with Xmonad but you can easily do the following I guess. create a pure function mkConfig
which takes the number of screens and returns the desired key mapping. Then, in your main
pass it to xmonad
function. I haven't tried to compile any of this but probably you can modify it easily
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