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dexie-relationships
Advanced tools
Dexie.js is a wrapper library for indexedDB - the standard database in the browser.
Dexie relationship plugin provides an API to ease the loading of relational data from foreign tables
npm:
npm install dexie-relationships --save
bower:
bower install dexie-relationships --save
Note the use of ->
which sets the foreign keys.
import Dexie from 'dexie'
import relationships from 'dexie-relationships'
var db = new Dexie('MusicBands', {addons: [relationships]})
db.version(1).stores({
genres: 'id, name',
bands: 'id, name, genreId -> genres.id',
albums: 'id, name, bandId -> bands.id, year'
});
db.transaction('rw', db.bands, db.albums, db.genres, () => {
// Genres
db.genres.bulkPut([{
id: 1,
name: "Rock"
},{
id: 2,
name: "Schlager"
}])
// Bands
db.bands.bulkPut([{
id: 1,
name: 'Beatles',
genreId: 1
},{
id: 2,
name: 'Abba',
genreId: 2
}])
// Albums
db.albums.bulkPut([{
id: 1,
name: 'Abbey Road',
year: 1969,
bandId: 1
}, {
id: 2,
name: 'Let It Be',
year: 1970,
bandId: 1
}, {
id: 3,
name: 'Super Trouper',
bandId: 2,
year: 1980
}, {
id: 4,
name: 'Waterloo',
bandId: 2,
year: 1974
}])
})
db.bands
.where('name').startsWithAnyOf('A', 'B') // can be replaced with your custom query
.with({albums: 'albums', genre: 'genreId'}) // makes referred items included
.then(bands => {
// Let's print the result:
bands.forEach (band => {
console.log (`Band Name: ${band.name}`)
console.log (`Genre: ${band.genre.name}`)
console.log (`Albums: ${JSON.stringify(band.albums, null, 4)}`)
});
})
NOTE: The properties that are set onto the result ('albums' and 'genre' in this case)
will not be visible when callilng JSON.stringify(band), because
they are marked as non-enumerable. The reason for this is to prevent the properties to be
redundantly stored back to the database if calling db.bands.put(band)
.
Band Name: Abba
Genre: Schlager
Albums: [
{
"id": 3,
"name": "Super Trouper",
"bandId": 2,
"year": 1980
},
{
"id": 4,
"name": "Waterloo",
"bandId": 2,
"year": 1974
}
]
Band Name: Beatles
Genre: Rock
Albums: [
{
"id": 1,
"name": "Abbey Road",
"year": 1969,
"bandId": 1
},
{
"id": 2,
"name": "Let It Be",
"year": 1970,
"bandId": 1
}
]
FAQs
Dexie relationship plugin
We found that dexie-relationships demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 2 open source maintainers collaborating on the project.
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