wishlist | Utilities I wish Android | Android library

I'm new to Flutter and I have an app in which I want to remove and add books to my Firebase RealTime Database.

The problem is when I try to remove a book by clicking on an icon, the book is indeed removed from the Firebase, however, when I run some code further down, in which i need the quantity of books on the wishlist, it always counts 1 more than the real number.

Here's my code in which I remove the selected book:

when i try to add list view builder , my entire screen is goes black here is the list view builder code

I had a question about django-templates. I was wondering about if we can add a filter in django template. I want to know if the product is in wishlist or no while rendering it. So, how can we know if it's in the wishlist or no? views.py

I am working on ecommerce website. I wanted to implement wishlist function on my website. And, it is working if its the first time for user that is adding to the list. In the second time giving an error. What's the problem? Can someone please help me? views.py

So, I have some product cards that I'm displaying with a foreach loop. When I click a link, I want to add that product to my wishlist (Session["wishList"]). That calls a function and redirects me to /product/wishlist/01, where 01 is the product id.

My temporary fix is return Content(""); but no reloading would be better.

My code:

I'm trying to make a javascript animation with window.requestAnimationFrame. It should be triggered when a button is clicked (like the "dropping" animation of a dropdown menu appearing). I use the variable timeElapsed to calculate the time since the button is clicked, and calculate the new height of the object with timeElapsed. I pass the time when the button is clicked (start) as an argument of the function. According to my console, although start (computed outside the function) is computed correctly, for some reason it changes to the time since the page is loaded once it is passed into the function.

Here's what I have so far:

Problem

I want to construct a nested dictionar with user entering key and values in Python. Below is an example of the dictionary.

so I want to make this simple wishlist feature for when the user tapped the "heart" button it will add that data from view to wishlist view. just like this :

so when the user tapped that heart button, that movie will show in this wishlist view like this :

now, my question is how do I notify my wishlistVc so that it knows there's a new "wishlist" that the user tapped from the movie list. I have an idea that I should use a delegate, but still, I can't figure out how to implement a delegate in this case.

and I use "var movieList" to store all the data in HomeVc, and my idea is when the user tapped that heart button in tableview, that data that user tapped with will move into my "let wishlist", so i can populate it on my wishlistVC ( but I don't know how to do this so I need help)

so far this is my code :

I am adding items to the wishlist and once it is added I am trying to re-render the Heart icon to have a number on it to indicate that the Item has been added to the wishlist. What I want to achieve is similar to Twitter's like button, when someone likes the post the number of likes increases immediately. So, in my case when someone likes (wishlists) the product it will increase the number on top of Heart icon. I am using local storage to get the items that are added to the wishlist, and I can re-render the Wishlist component when a new Item is added inside the effect but it makes the component to re-render infinitely which is giving me a warning of Warning: Maximum update depth exceeded

Here is my effect;