Created
March 7, 2017 15:39
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Use facebook's dataloader to batch any Service get
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'use strict'; | |
const DataLoader = require('dataloader'); | |
class Service { | |
constructor({ BaseService, options }) { | |
this.id = BaseService.id || 'id'; | |
this.service = BaseService; | |
this.dataloader = new DataLoader(this._batchGet.bind(this), options); | |
} | |
_batchGet(ids) { | |
console.log('Batched Ids: ', ids.join(',')); | |
const cachedPromises = {}; | |
const promises = ids.map((id) => { | |
if (cachedPromises[id] === undefined) { | |
cachedPromises[id] = this.service.get(id); | |
} | |
return cachedPromises[id]; | |
}); | |
return Promise.all(promises); | |
} | |
find(params) { | |
return this.service.find(params) | |
.then((result) => { | |
if (Array.isArray(result)) { | |
result.forEach((object) => { | |
this.dataloader.prime(object[this.id], object); | |
}); | |
} | |
return result; | |
}); | |
} | |
get(id, params) { | |
return this.dataloader.load(id); | |
} | |
create(data, params) { | |
if(Array.isArray(data)) { | |
return Promise.all(data.map(current => this.create(current))); | |
} | |
return this.service.create(data, params) | |
.then((object) => { | |
this.dataloader.prime(object[this.id], object); | |
return object; | |
}); | |
} | |
update(id, data, params) { | |
return this.service.update(id, data, params) | |
.then((object) => { | |
this.dataloader.clear(id).prime(id, object); | |
return object; | |
}); | |
} | |
patch(id, data, params) { | |
return this.service.patch(id, data, params) | |
.then((object) => { | |
this.dataloader.clear(id).prime(id, object); | |
return object; | |
}); | |
} | |
remove(id, params) { | |
return this.service.remove(id, params) | |
.then((object) => { | |
this.dataloader.clear(id); | |
return object; | |
}); | |
} | |
} | |
function initService(options) { | |
return new Service(options); | |
} | |
module.exports = initService; | |
module.exports.Service = Service; |
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