oad-utils
Collection of utility functions for OAD: Operations As Data.
OAD: Operation As Data
Operations As Data(OAD) is the concept of handling large JSON data that all the data operations (update/find) should be written as JSON format (≒ plain object).
This oad-utils
provides utility functions for handling OAD.
Phenyl Family
oad-utils
is one of Phenyl Family.
Phenyl is a JavaScript Server/Client framework for State Synchronization over Environment(SSoE).
Installation
npm install oad-utils
Using types with flow
For Flow annotations, just use /jsnext
entrypoint.
All the interfaces are defined in the depending module mongolike-operations.
API Documentation
Overview
- normalizeQueryCondition()
- getNestedValue()
- hasOwnNestedProperty()
- updateOperationToJSON()
- normalizeUpdateOperation()
- mergeUpdateOperations()
- findOperationToJSON()
- visitFindOperation()
- parseDocumentPath()
- convertToDotNotationString()
- createDocumentPath()
Definitions
FindOperation
Operation to find values in large JSON.
See FindOperation(mongolike-operations) for detailed definition.
Example:
const findOperation = $and: libraryName: 'phenyl' 'libraryVersion.major': $gte: 1
QueryCondition
Condition to find values in large JSON, included in FindOperation
.
Almost compatible with MongoDB's Query Operators.
See QueryCondition(mongolike-operations) for detailed definition.
UpdateOperation
Operations to update values of large JSON. Almost compatible with MongoDB's Update Operators.
See README of power-assign for more detailed use.
Restorable
Restorable is a characteristic of JavaScript class instances which meets the following requirement.
const jsonStr = JSONconst plain = JSONconst newInstance = plain assert
Roughly, Restorable object is an instance which can re-created by passing its JSON object to the class constructor.
See is-restorable module for more detail.
DocumentPath
The same definition as Amazon DynamoDB's DocumentPath.
type DocumentPath = string
DocumentPath expresses nested value location.
foo: arr: bar: 'baz'
The string 'baz'
is expressed as 'foo.arr[0].bar'
in DocumentPath format.
This DocumentPath is slightly different from Dot Notation in MongoDB which expresses 'baz'
as 'foo.arr.0.bar'
(array index expression is different).
normalizeQueryCondition()
Convert the given object into regular QueryCondition.
const cond = name: 'Shin' const normalized = assert
getNestedValue()
Get the value in the object at the DocumentPath.
const obj = foo: bar: {} {} baz1: false baz2: null foo2: undefined
Behavior toward non-existing values:
const noNullAccess = trueassert
Set the 3rd argument noNullAccess
to true and an error is thrown when property access to null occurs.
hasOwnNestedProperty()
Check if the object has the DocumentPath.
const obj = foo: bar: {} {} baz1: false baz2: null foo2: undefined
updateOperationToJSON()
Convert UpdateOperation to Restorable JSON format.
{ thisfirst = paramsfirst thislast = paramslast } const person = name: first: 'Shin' last: 'Suzuki' const op = $restore: name: Name $set: 'name.first': 'Shun' assert // classes re converted to {} over serializationassert
mergeUpdateOperations()
[Experimental] Merge UpdateOperations into one UpdateOperation.
const merged = assert
normalizeUpdateOperation()
Convert SetOperator to normalized operation.
const op = 'baz.biz': 3 )assert
findOperationToJSON()
Convert FindOperation to Restorable JSON format.
const where = name: $regex: /^John/ assert // regex are converted to {} over serializationassert
visitFindOperation()
Modify FindOperation by passing visitor functions.
Visit with simpleFindOperation
visitor:
const where = $or: email: 'foo@example.com' password: 'foo-bar' email: 'bar@example.com' password: 'foo-bar' const modifiedWhere = assert
Visit with queryCondition
visitor:
const where = name: $regex: /foo/ const modifiedWhere = assert
parseDocumentPath()
Parse DocumentPath into an array of property names.
const docPath = 'user.favorites[1].music[30000]'const attributes = assert
createDocumentPath()
Create DocumentPath from arguments.
const docPath =
convertToDotNotationString()
Convert DocumentPath to MongoDB's Dot Notation.
const docPath = 'user.favorites[1].music[30000]'const dotNotationString =
LICENSE
Apache License 2.0