pouchdb | : koala : - PouchDB is a pocket-sized database | Database library
kandi X-RAY | pouchdb Summary
kandi X-RAY | pouchdb Summary
[PouchDB] – The Database that Syncs!.
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pouchdb Key Features
pouchdb Examples and Code Snippets
Lines of Code : 58License : Permissive (Apache-2.0)
Copy// Options
// emitter: Optionally pass an instance of EventEmitter for hoodieApi to use
var db = new PouchDB('dbname')
var api = db.hoodieApi({
emitter: existingEventEmitter
})
// all methods return promises
api.add(object)
api.add([object1, id2] npm install
npm run example
import newRxPouchDb, { DocId, VersionedDoc } from 'rx-pouchdb/dist'
import debug = require('debug')
const PouchDB = require('pouchdb-browser') // no valid type definitions for TS2
debug.enable('example:*,rx-pouchdb:*') // 
License : No LicenseCopyconst PouchDB = require('pouchdb')
PouchDB.plugin(require('comdb'))
const password = 'extremely secure value'
const db = new PouchDB(POUCH_PATH)
db.setPassword(password)
db.post({
_id: 'gay-agenda',
type: 'queerspiracy',
agenda: ['be gay', ' import * as PouchDB from 'pouchdb';
import PouchDB from 'pouchdb';
const PouchDB = require('pouchdb')
const db = new PouchDB('todos')
const username = 'KEY'
const password = 'PASSWORD'
const host = 'mycloudservice.cloudant.com'
const databaseName = 'todos'
const remoteDB = `https://${username}:${password}curl -X PUT http://127.0.0.1:5984/{db_name}const express = require("express"),
app = express(),
PouchDB = require("pouchdb");
// In the current directory, place all database files into a directory named 'databalet PouchDB = require("pouchdb");
PouchDB.plugin(require("pouchdb-find"));
PouchDB.plugin(require("pouchdb-authentication"));
const testUrlTemplate = "http://*127.0.0.1:5984/test";
const doTask = async (db) => {
await db.createIndexvar PouchDB = require('pouchdb');
var db = new PouchDB('my_db');
import PouchDB from 'pouchdb';
import PouchdbFind from 'pouchdb-find';
export class PouchService {
constructor() {
PouchDB.plugin(PouchdbFind);
}
}function map(doc) {
if(doc.status) {
emit(doc.status, null);
}
}
function reduce(key, values) {
return null;
}
// PouchDB request
return this.database.query('general/all-status', Community Discussions
Trending Discussions on pouchdb
QUESTION
I am working on small form in electron and pouchdb.
When inserting a data into db, until the ninth doc it inserting perfectly, but on 10th doc it is inserting to second position of doc instead on inserting into last
before inserting the 10th doc
...ANSWER
Answered 2022-Feb-08 at 15:39You have an errant notion regarding document insertion, whether as if the order of insertion with respect to time matters which is to be expected from say an RDBMS like MS/SQL, or a belief that a string representation of a numeric value should be sorted according to the implied numerical value (which would be wild guessing by the db).
As explicitly stated here, here and here, and as specified by the CouchDB documentation 3.2.2.5. Collation Specification
Comparison of strings is done using ICU which implements the Unicode Collation Algorithm, giving a dictionary sorting of keys. This can give surprising results if you were expecting ASCII ordering.
Documents are not returned by order of insertion rather they are returned according to the collation rules applied to the document ids, and document ids are strings.
For example you expect this ordering:
row # id 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 10BUT that is not according to the collation rules, which yields
row # id 0 1 1 10 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9Again, it cannot be emphasized enough that the order of insertion, much less an implied numeric value, does not affect the order of results. From an RDBMS perspective it is helpful to approach _all_docs results as being ordered by an index on _id which is sorted according to collation rules (again, for strings since all _ids are of type string).
The snippet below demonstrates this by creating 100 documents with ids ranging from 1 to 100.
QUESTION
I am looking for a way to paginate in pouchdb by specifying the number of the page that I want.
The closest example I came across is this:
...ANSWER
Answered 2022-Jan-21 at 19:40There is no easy answer to the question. A small slice from 3.2.5.6. Jump to Page
One drawback of the linked list style pagination is that you can’t pre-compute the rows for a particular page from the page number and the rows per page. Jumping to a specific page doesn’t really work. Our gut reaction, if that concern is raised, is, “Not even Google is doing that!” and we tend to get away with it. Google always pretends on the first page to find 10 more pages of results. Only if you click on the second page (something very few people actually do) might Google display a reduced set of pages. If you page through the results, you get links for the previous and next 10 pages, but no more. Pre-computing the necessary startkey and startkey_docid for 20 pages is a feasible operation and a pragmatic optimization to know the rows for every page in a result set that is potentially tens of thousands of rows long, or more.
If you are lucky and every document has an ordered sequence number, then a view could be constructed to easily navigate pages.
Another strategy is to precompute (preload) a range of keys, which is more reasonable but is complicated. The snippet below creates a trivial database which can be paged through via nav links.
There are 5 documents per page, and each "chapter" has 10 pages. computePages performs the look ahead
QUESTION
Let's say I have 100 documents (Note: total of documents will definitely increase). Getting all 100 documents at once will cause performance issue so I figured that I need to do infinite scroll and display, let's say, 15 documents on first load. Every time infinite scroll is triggered, it should get another 15 documents.
Basically, docArr.length = 100
First load: grab docArr[0] to docArr[14]
Trigger Infinite Scroll: grab docArr[15] to docArr[29] and so on until docArr[99] is grabbed too
In the PouchDB FAQ on Pagination, it's stated that startkey, endkey, limit and skip need to be used.
My document id is in the format doc-1. So I have doc-1, doc-2, doc-3, etc
I followed the suggested method to use so my code is;
...ANSWER
Answered 2022-Jan-19 at 15:52I am not 100% clear on what is going on with the OP's code but the assumption that the response.rows of the first query to _all_docs is ordered so
is wrong. Document id's are strings and as such follow the collation rules documented at CouchDB documentation 3.2.2.5. Collation Specification.
This should be the actual sequence of document id's returned by the initial call to _all_docs according to the format of the document ids specified by the OP:
Hence the calculation of the next set of results is flawed
QUESTION
I am using PouchDB and CouchDB in an ionic application. While I can successfully sync local and remote databases on Chrome and Android, I get unauthorized error on Safari / iOS when I run the sync command. Below is a simplified version of my database service provider.
...ANSWER
Answered 2022-Jan-11 at 00:41Changing the HTTP plumbing sounds like a really bad idea - time cost, mainly - unless you just absolutely have to use sessions/cookies...If you don't, read on.
as noted here regarding pouchDB Security, I tried using pouchdb-authentication when it was actively maintained and went another route due to multiple issues (I don't recall specifics, it was 6 years ago).
Do note the last commit to pouchdb-authentication seems to be 3 years ago. Although inactivity is not an negative indicator on the surface - a project may have simply reached a solid conclusion - installing pouchdb-authentication yields this
QUESTION
I am trying to create an application that uses PouchDB as an adapter to a CouchDB running on a server.
Problem: After some minutes of inactivity I get the following error on trying to access the database again:
{
"error": "unauthorized",
"reason": "You are not authorized to access this db.",
"status": 401,
"name": "unauthorized",
"message": "You are not authorized to access this db.",
"docId": "category:aktien"
}
My feeling is, that the HTTP-Connection between Pouch and Couch has a timeout... what can I do about that?
I cant find a "signal" that informs me about the timeout, so I could reconnect. Is there any?
Best Regards, Tobias
...ANSWER
Answered 2021-Nov-13 at 18:45In the settings of CouchDB you can set the session timeout... default is 10 minutes (600 s).
QUESTION
I am looking for a way to adapt query fields in the db-find selector. I need this because filters access different fields which may or may not be active all the time.
I have tried two options, but none of them work:
- In the first option I tried to build the query as a string and let it be evaluated:
ANSWER
Answered 2021-Nov-02 at 16:07Given the comments above, simply create a collection for an explicit $and
QUESTION
I have asked the following question on the CouchDB Github Repo, where it was suggested to me to ask it here on Stackoverflow instead.
Suppose we have a couchdb document structured like this:
...ANSWER
Answered 2021-Oct-25 at 18:12A brute force way is to create an index for properties
QUESTION
I was reading on a blog about Promises and they show a problem that I don´t get at all. The blog is: https://pouchdb.com/2015/05/18/we-have-a-problem-with-promises.html.
The writer presents 4 puzzles with a grafical solution:
Puzzle #1
...ANSWER
Answered 2021-Oct-15 at 14:03Puzzle #1 and #4 as well as Puzzle #2 and #3 are the same.
In your Puzzle #2, you start another Promise and return instantly, without awaiting it. So your finalHandler will get called immediately after doSomethingElse was started, not after it is finished. If you want that, use your Puzzle #1
In your Puzzle #3, you pass the started Promise returned by doSomethingElse() directly instead of telling js to call that function if doSomething resolved. If you want do do so, write it like that - it might help to avoid confusion
QUESTION
I'm working on a project where I need to loop through multiple values and then count the number of items in a database that match those values. The results are then returned.
Here is the code I am wanting to run:
...ANSWER
Answered 2021-Oct-14 at 18:42"SyntaxError: await is only valid in async function"
The error can be fixed by making sure you're doing this in an async function.
QUESTION
I'm trying to get relational-pouch working, I'm able to set the schema but when I call the save function I get the error TypeError: this.rel.save is not a function
This is the setup:
...ANSWER
Answered 2021-Oct-12 at 16:12You're not using the rel field as advertised. From the type declaration rel is defined as
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