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document-manager.js
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document-manager.js
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const { DataSource } = require('apollo-datasource');
/**
* Manages ArangoDb documents
*
* @class DocumentManager
* @extends {DataSource}
*/
class DocumentManager extends DataSource {
/**
* Creates an instance of DocumentManager.
* @param {Collection} collection The ArangoDb document collection to manage
* @memberof DocumentManager
*/
constructor(collection) {
super();
this.collection = collection;
}
/**
* Create a new document and add it to the collection
*
* @param {*} input
* @returns {*} An object with the created document as the new field
* @memberof DocumentManager
*/
async create(input) {
const { new: document } = await this.collection.save(input, {
returnNew: true,
});
return { new: document };
}
/**
* Replace all of a document's values
*
* @param {String} id The id of the document to update
* @param {*} input An object with the values to replace
* @returns {*} An object with the old and new versions of the document
* @memberof DocumentManager
*/
async replace(id, input) {
const results = await this.collection.replace(id, input, {
returnNew: true,
returnOld: true,
});
return {
new: results.new,
old: results.old,
};
}
/**
* Updates a subset of a document's values. Values not passed as input are left unchanged.
*
* @param {String} id The id of the document to update
* @param {*} input An object with the values to update
* @param {*} [{ keepNull = false, mergeObjects = false }={}] A set of options:
* keepNull: if true null values are left as null. If false, the field is removed.
* @returns An object with the old and new versions of the document
* @memberof DocumentManager
*/
async update(id, input, { keepNull = false, mergeObjects = false } = {}) {
const results = await this.collection.update(id, input, {
keepNull,
mergeObjects,
returnNew: true,
returnOld: true,
});
return {
new: results.new,
old: results.old,
};
}
/**
* Removes a document from the collection.
*
* @param {String} id The id of the document to remove
* @returns An object with the old version of the document
* @memberof DocumentManager
*/
async remove(id) {
const { old: document } = await this.collection.remove(id, {
returnOld: true,
});
return { old: document };
}
}
module.exports = {
DocumentManager: DocumentManager,
};