POT | PHP OTServ Toolkit ) is a PHP toolkit | REST library

Use sum and count with list comprehension

You should deffinitely use a cloud function to update the stock. Create a function onCreate and onDelete functions trigger. If users can change data you would also need to onWrite function trigger.

Depending on the amount of data you have you woould need to create a custom queue system to update the stock. Belive me! It took me almost 2 years to figure out to solve this. I have even spoken with the Firebase engeeners at the last Firebase Summit in Madrid.

Usualy you would use a transaction to update the state. I would recommend you to do so if you don't have to much data to store.

In my case the amount of data was so large that those transactions would randomly fail so the stock wasn't correct at all. You can see my StackOverflow answer here. The first time I tought I had an answer. You know it took me years to solve this because I asked the same question on a Firebase Summit in Amsterdam. I asked one of the Engeeners who worked on the Realtime Database before they went to Google.

There is a solution to store the stock in chunks but even that would cause random errors with our data. Each time we improved our solution the random errors reduced but still remained.

The solution we are still using is to have a custom queue and work each change one by one. The downside of this is that it takes some time to calculate a lot of data changes but it is 100% acurate.

Just in case we still have a "recalculator" who recalculates one day again and checks if everything worked as it should.

Sorry for the long aswer. For me it looks like you are building a similar system like we have. If you plan to create a warehouse management system like we did I would rather point you to the right direction.

In the end it depends on the amount of data you have and how often or fast you change it.

Add these styles to your CSS to hide them:

The first thing to know about jQuery .clone() is that it creates new DOM elements from some existing ones.

That implies the same rules as any other dynamically created elements:

• Do not use ids
• Delegate event handlers

Additionnally, the cloned set of elements cannot be appended multiple places... So, to use it as a templating trick, you have to clone twice. Once on page load (to save them before any change occurs) and once again when appending somewhere.

Your code is correct. And TreeTable does show all columns, you just miss the horizontal scroll at bottom of the grid.

To fix the situation, you need to

• init UI in container ( currently it is atached to the body ). To do so you need to add container property to the UI configuration

you can always check the length of list and make a loop to iterate over that length.

You need to check if the first index i.e i to be 0 or not, But you are checking equality for the character at 0 i.e I.

Since I is not equal to 0 so it skips the match.

So you need to change from

I think you've put your finger on it. When you say animatingDifferences is to be false, you are asking the diffable data source to behave as if it were not a diffable data source. You are saying: "Skip all that diffable stuff and just accept this new data." In other words, you are saying the equivalent of reloadData(). No new cells are created (it's easy to prove that by logging), because all the cells are already visible; but by the same token, all the visible cells are reconfigured, which is exactly what one expects from saying reloadData().

When animatingDifferences is true, on the other hand, the diffable data source thinks hard about what has changed, so that, if necessary, it can animate it. As a result of all that work behind the scenes, therefore, it knows when it can avoid reloading a cell if it doesn't have to (because it can move the cell instead).

Indeed, when animatingDifferences is true, you can apply a snapshot that reverses the cells, and yet configure is never called again, because moving the cells around is all that needs to be done:

The feature you are using here is called "flexible array member". If the array size is empty, the size of the overall struct doesn't include the array at all. So a variable of overall type doesn't contain any memory for your potPointers.

It's programmer's responsibility to allocate space for potPointers. Note that this usually means allocating the struct dynamically, using malloc. Then, you (the programmer) can tell it to allocate more memory than sizeof(overall).

For example: