WatermelonDB | 🍉 Reactive & asynchronous database | Frontend Framework library
kandi X-RAY | WatermelonDB Summary
kandi X-RAY | WatermelonDB Summary
Build powerful React and React Native apps that scale from hundreds to tens of thousands of records and remain fast ️.
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Top functions reviewed by kandi - BETA
- Makes an html word
- global event handler
- set the theme
- Run code block
- Create a raw record from a raw table .
- Wrap write function
- Search for new URL
- Function to update a play button
- Set raw values for a raw column
- Do the search term
WatermelonDB Key Features
WatermelonDB Examples and Code Snippets
Community Discussions
Trending Discussions on WatermelonDB
QUESTION
ANSWER
Answered 2022-Jan-26 at 17:29The docs are actually wrong. For everybody having the same problem:
index.js
QUESTION
I'm trying to debounce()
an Observable
with pipe()
and chaining .subscribe()
but for some reason the function in the subscribe is still being called over a dozen times in one go.
What I'm trying to do is pipe the withChangesForTables
and debounce the sync call because I want it to be called only when a whole batch of changes have been made. So I created a provider for the sync and wrapped it around my RootNavigator
ANSWER
Answered 2022-Jan-04 at 21:34I had to move withChangesForTables
into a useEffect
and retrun it in order to unsubcribe which seems to have resolved the issue. The code now looks something like this:
QUESTION
I encounter this error message when I start my react native app: Invariant Violation: "backdropFilter" is not a valid style property.
I checked that I don't have any backdropFilter
used in my source code. But I still got this error.
full error message:
...ANSWER
Answered 2021-Nov-02 at 07:31It is because backdropFilter is not one of the style props supported by react-native. You can remove it in you style sheet and the program should be able to work.
QUESTION
I have a React Native project managed by expo and I am trying to work on an offline database so ended up going with the expo-sqlite package since everything else that is better (watermelondb, pouchdb, realm etc.) doesn't work with expo managed workflow. So very basic table creation is working fine, but whenever I am trying to add a foreign key it just says that the parent table can't be resolved. So in the following chunk of code, the error is Unable to resolve table 'Profile'
.
Below is a good picture to illustrate what I am seeing on IntelliJ. So far I haven't found any way of selecting a Datasource since if you are developing with expo the very basic way (not specifically for android or iOS) then there's no way to choose the Datasource.
I know that you would also have to turn on PRAGMA Foreign Keys and I have done so as well first with tx.executeSql
and finally what you see below (that's how it currently is).
I have also gone to Project Structure and tried out SQLite, GeneralSQL, and MySQL for SQL Dialects under Langauge and Framework.
I am launching the expo app on an iOS device if that makes any difference at all.
...ANSWER
Answered 2021-Jan-31 at 21:29The problem wasn't anything to do with this specific table but another one similar to this one later down the file. Also disregard the red on table_name and column_id, since that is something not solvable with how IntelliJ IDEA is setup (at least with what I have come to figure out!)
So initially I had the code like the following. Notice how the foreign key is declared on line 4
After a whole lot of commenting and uncommenting chunks of code, I found out that this was the one that was causing the problem. So I found out in this github issue that you can write transaction in the following way:
QUESTION
I want to run multiple functions with async/await including a for loop as well. The loop also needed to be run one another is done. Currently I'm using this function and seems like it is not working correctly.
For the for loop query I need the id created in first query to perform it.
...ANSWER
Answered 2020-Nov-08 at 17:08Yes you are right!. It will not work properly with multiple database create record requests together.
Whenever you make more than one change (create, delete or update records) in an action, you should batch them.
See: https://nozbe.github.io/WatermelonDB/Actions.html
You can do like that:
QUESTION
I have a single table created on WatermelonDB, in my React Native Android app. When I use batch to insert new records to the table, from a component, I get the error TypeError: Cannot read property 'id' of undefined
thrown inside batch.
This is where batch is called with a list of Promise
objects:
ANSWER
Answered 2020-Mar-12 at 12:11Issue was with the async keyword.
QUESTION
I have upgraded to React Navigation v5
in my app. I am using watermelondb in my app.
While using ReactNavigationv4
, I used to pass the database props as follows
ANSWER
Answered 2020-Feb-13 at 19:32You should use React context API to pass your database
to all screens: https://reactjs.org/docs/context.html
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