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QUESTION
Im trying to fetch Data from an API and pass it into my component as props. The Problem is I get this type error. Some googling showed, that the API seems to return an object and the map() function is expecting an Array. Okay, console logged what I get from the API and it is indeed an object. Easy fix right? However, none of the fixes I found for this work. This is my original code with the error:
...ANSWER
Answered 2021-May-18 at 07:17Are you using useEffect? Usually these problems are related to async fetching and initially getting undefined or empty lists etc. as a prop before data is actually available. If you are using effect, then try to catch the first error by calling map only if recipes is defined.
For your second solution: check the contents of arr by logging it.
QUESTION
i got the following code:
...ANSWER
Answered 2020-Oct-13 at 13:40vector.removeAllElements();
QUESTION
Ok so I generated a random name of a document and now I'm trying to get data from that document.
...ANSWER
Answered 2020-Sep-25 at 20:40I'm guessing that when you say
I tried using the content of the String and put it directly in the DocumentReference and it worked
You mean that you ran
QUESTION
I have a problem, to solve it I tried going into the shell but I couldn't find out the solution so I hope that you can help me. I'm importing my Model Images which contains an id and the image URL but I can't get it because of this error. The code:
...ANSWER
Answered 2020-Sep-03 at 15:27Django automatically adds a primary key if you did not specify one yourself. Indeed, as the documentation says:
By default, Django gives each model the following field:
QUESTION
i want to fetch data before screen is rendered so i can show the fetched data in a flatlist. but its not working. how can i fix that problem ?
...ANSWER
Answered 2020-Sep-02 at 08:51You are mutating userRecipes state in fetchRecipes function.
You can do something like this
QUESTION
after hours of search I need your help. I have setup a program for iOS showing recipes of my private cooking book. The recipes are stored in a json file on my web server. I use another application on my MAC to update the recipes in this json file and to store it on my web server. Unfortunately the updated recipes are not shown in my iOS-application. The iOS-app shows always the old data - I guess they are stored locally on my iPhone/iPad after the first installation of the app?
How can I enforce that at every launch of the iOS-app on my iPhone/iPad the actual json data from the web server are used and not the old one.
I retrieve the data via this function I call from the viewDidLoad() and before the reloadData() of the UITableView showing the titles of the recipes
...ANSWER
Answered 2020-Jul-06 at 13:05Few possibilities:
- hope you are not storing the data locally(coredata/plist/any file), and loading it anywhere in your app.
- Your web server might be caching the old data, please check once.
- See if you have any hardcoded sample data which was used for testing purpose but not removed after actual implementation.
Hope this helps.
QUESTION
My problem is that I have a sqlite Database with a column 'Rezepte'(Recipes) which contains a column 'Rezept_ID' and a column with the name('Rezept_Title') and I get a output like this:
{Rezept_ID: 0, Rezept_Title: [84, 104, 117, 110, 102, 105, 115, 99, 104, 102, 105, 108, 101, 116, 32, 105, 110, 32, 90, 105, 109, 116, 45, 83, 101, 115, 97, 109, 45, 75, 114, 117, 115, 116, 101, 32, 97, 117, 102, 32, 67, 104, 105, 108, 105, 45, 77, 97, 110, 103, 111, 45, 83, 97, 108, 97, 116]}
But I want for example(I'm not sure what the encoding means):
{Rezept_ID: 0, Rezept_Title: 'spaghetti'}
I found out that the numbers are just a decimal encoding and my question is: How can I encode always just the column 'Rezept_Title' anscii? Or is there another encoding which dart shows in cleartext? My current function to get the recipes is:
...ANSWER
Answered 2020-Jun-21 at 19:52Looks like Rezept_Title is an array representation of a buffer instead of a string.
To make a string back out of a buffer array, use: new String.fromCharCodes(array)
In example:
QUESTION
I have a problem I have in one file(Recipe.dart) a method called fetchAll() and I need this to return a list of my Recipes and to do this I created a Future:
...ANSWER
Answered 2020-Jun-23 at 21:00This is just a rough idea of how you might implement this.
I would start by creating a RecipiesRepository.
In there you could have a method that fetches the title, ingredients, preparation and images and returns them all in one easily readable object.
You could have a method that fetches everything in one request like so:
QUESTION
I have the problem that I can convert ½ to 0.5 but I don't know how to convert 1 ½ to 1.5 or 2 ½ to 2.5. This is the link. There is the row 1 ½ kg and I think it would help me if you could show me e.g. a more advanced replace() parameter or something. This is what I already have to convert to 0.5:
...ANSWER
Answered 2020-Jun-10 at 08:52A posssible solution:
QUESTION
it took me the whole day trying to fix this problem but I didn't found a solution so I hope you can help me. I already tried to extract the data from the website. But the problem is that I don't know how to split the list so that 500g converts to 500,g. The problem is that on the website sometimes the quantity is 1 and sometimes 1 1/2 kg or sth. And now I need to convert it into a CSV file and then into a MySQL database. What I want at the end is a CSV file with the columns: ingredients ID, ingredients, quantity, and the unit of the quantity from the ingredient. So for example: 0, meat, 500, g. This is the code I already have to extract the data from this website:
...ANSWER
Answered 2020-Jun-09 at 20:29It appears that the strings containing fractions use the unicode symbols for 1/2 etc., so I think a good way of starting is replacing those by looking up the specific code and passing it to str.replace(). Splitting up the units and the amount for this example was easy, since they are separated by a space. But it might be necessary to generalize this more if you encounter other combinations.
The following code works for this specific example:
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