128 lines
2.9 KiB
JavaScript

// UUID
// https://gist.github.com/LeverOne/1308368
/* jshint ignore:start */
function uuid (a, b) { for (b = a = ''; a++ < 36; b += a * 51 & 52 ? (a ^ 15 ? 8 ^ Math.random() * (a ^ 20 ? 16 : 4) : 4).toString(16) : '-');return b }
/* jshint ignore:end */
module.exports = {
// Empties properties
__empty: function (doc) {
this.forEach(doc, function (value, key) {
delete doc[key]
})
},
// Copies properties from an object to another
__update: function (dest, src) {
this.forEach(src, function (value, key) {
dest[key] = value
})
},
// Removes an item from an array
__remove: function (array, item) {
var index = this.indexOf(array, item)
if (index !== -1) array.splice(index, 1)
},
__id: function () {
var id = this.id || 'id'
return id
},
getById: function (collection, id) {
var self = this
return this.find(collection, function (doc) {
if (self.has(doc, self.__id())) {
return doc[self.__id()].toString() === id.toString()
}
})
},
createId: function (collection, doc) {
return uuid()
},
insert: function (collection, doc) {
doc[this.__id()] = doc[this.__id()] || this.createId(collection, doc)
var d = this.getById(collection, doc[this.__id()])
if (d) throw new Error('Insert failed, duplicate id')
collection.push(doc)
return doc
},
upsert: function (collection, doc) {
if (doc[this.__id()]) {
// id is set
var d = this.getById(collection, doc[this.__id()])
if (d) {
// replace properties of existing object
this.__empty(d)
this.assign(d, doc)
} else {
// push new object
collection.push(doc)
}
} else {
// create id and push new object
doc[this.__id()] = this.createId(collection, doc)
collection.push(doc)
}
return doc
},
updateById: function (collection, id, attrs) {
var doc = this.getById(collection, id)
if (doc) {
this.assign(doc, attrs, {[this.__id()]: doc[this.__id()]})
}
return doc
},
updateWhere: function (collection, predicate, attrs) {
var self = this
var docs = this.filter(collection, predicate)
var key = this.__id()
docs.forEach(function (doc) {
self.assign(doc, attrs, {[key]: doc[key]})
})
return docs
},
replaceById: function (collection, id, attrs) {
var doc = this.getById(collection, id)
if (doc) {
var docId = doc[this.__id()]
this.__empty(doc)
this.assign(doc, attrs, {[this.__id()]: docId})
}
return doc
},
removeById: function (collection, id) {
var doc = this.getById(collection, id)
this.__remove(collection, doc)
return doc
},
removeWhere: function (collection, predicate) {
var self = this
var docs = this.filter(collection, predicate)
docs.forEach(function (doc) {
self.__remove(collection, doc)
})
return docs
}
}