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QUESTION
I been trying to figure this out for the entire weekend so I finaly decided to ask you for your advice.
Got a streambuilder which listens for a stream or recipes (filtered by the category -> soups, deserts etc.).
I were confused because the Text "Nothing" (last return statement) was the only thing showing, even though my print statements in the if condition, which asks for the connectionstate.active shows me all the values.
When I print the connection state out one line above my text widget "Nothing" I get "active".
Of course I could just get rid of my if statement and put the returning widget at the end, but I would like to know and understand, why my return statement in my .active condition does not show me the column etc. even though the print statements are shown in the console.
Btw I saw alot of other resources were a Listview is used but I am not sure weather or not I can use a Listview together with a stack (because I want to show data on top of each other).
Looking forward to your replys!
Regards Thomas
...ANSWER
Answered 2022-Feb-07 at 05:00Once the StreamBuilder has recieved all of the data and a done signal, the state becomes done. It does not sit there in there in active. Your checks should go is waiting, has data, and a catch all afterwards for no data.
UPDATE: The issue is in your return statement in the if(snapshot.connectionState == ConnectionState.active) block. You are not actually returning a widget from the block, so the function is continuing until it reaches the final return statement.
First, make this if statement if(snaphsot.hasData). Then take a look at this section:
QUESTION
Iam writing a cookbook app. The recipes of the cookbook are stored in yaml files and these are being stored in a static way. When I load up the site, it will automatically reach out to an index.json file in which all recipes are indexed and load them one after one and add them to an array. This array is then given to the setRecipe method where it should update the dom accordingly. This doesn't happen. I already tried to console.log a little and when doing this I get logged the expected data but as soon as I refresh the page this isn't case anymore. The request for the yaml files are being done. Why does that happen?
Full Sourcecode
...ANSWER
Answered 2022-Jan-23 at 11:10useEffect runs based on the dependency array that is passed as the second argument of the useEffect hook.
Try this,
QUESTION
I am working on a Project using Android Room and I'm kind of stuck with using a Many-To-Many-Relation. I have found this question kind of similiar to mine but I still can't get it to work.
So I basically follows the Documentation and did a Reciepe and Ingredient Relationship:
...ANSWER
Answered 2021-Oct-25 at 10:52This isn't going to a simple one line fix.
First you need to be able to detect if a Zutaten exists and probably if a Rezepte exists (so a RezeptWithZutat for an existing Rezept does create a new one but adds to the existing one).
So first two new Dao's
- Note instead of an interface, the following code uses an abstract class so abstract fun is used instead of fun.
- Also all dao's have been combined into one abstract class namely AllDao.
- Note I don't do LiveData stuff so the code does not use LiveData and the code I've copied has had all LiveData removed to allow a working demonstration.
:-
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:
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