circular-reference

问题 I have an object which has a circular reference to another object. Given the relationship between these objects this is the right design. To Illustrate Machine => Customer => Machine As is expected I run into an issue when I try to use Json to serialize a machine or customer object. What I am unsure of is how to resolve this issue as I don't want to break the relationship between the Machine and Customer objects. What are the options for resolving this issue? Edit Presently I am using Json

问题 I have just started working on QlikView and facing difficulty in data-modelling. can anybody help me in resolving circular reference in the following model. Data-Model With Circular Reference Any help would be appreciated. 回答1: One solution could be to load the Cities table twice ( Cities and Cities2 ) and name the unique key CityId2 in Cities2 and in Branches . An other way could be to join the Cities into their refering tables while selecting the data from your database. 回答2: Left Join

问题 In Kotlin, say I have data class A (val f: B) and data class B (val f: A) . I want to initialize local var a: A and var b: B such that a.f is b and b.f is a . A.f and B.f must remain vals. Is this circular instantiation possible? data class A(val f: B) data class B(val f: A) fun foo() { var a: A var b: B // instantiate a and b here with a.f == b and b.f == a ?? } 回答1: Not exactly what you want but should work: interface A { val f: B } interface B { val f: A } data class AImpl(override var f:

问题 Please consider the following code var factory = function (element, opts) { var MutationObserverController = function (element, opts) { var defaults = { subtree: true, childList: true, characterData: true }; this.options = $.extend({}, defaults, opts); this.watchedElement = element; this.observer = new MutationObserver(this.mutationObserver); this.observer.context = this; //console.log(this.observer); //->THIS LINE }; MutationObserverController.prototype.connect = function () { this.observer

问题 For this xml: <elem1 xmlns="http://www.fixprotocol.org/ns/fast/t/1.0"> <elem2> <elem2/> </elem2> </elem1> I have this schema, which seems to validate fine against w3 schema validation service, and the schema validates the above XML just fine. Sadly, xsd.exe and some other tools report it to be an error. Is that correct? Are circular group refs dissallowed by XML schema? Thanks! Update: The schema is not mine, can't change it :( <xs:schema attributeFormDefault="unqualified" elementFormDefault=

问题 Suppose I have two records: Person and Animal . Each record is in a separate package. Package persons: with animals; use animals; package persons is type person is record ... animalref: animalPOINTER; ... end record; type personPOINTER is access person; end persons; Package animals: with persons; use persons; package animals is type animal is record ... ownerref: personPOINTER; ... end record; type animalPOINTER is access animal; end animals; I have Circular Unit Dependency here, and compiler

问题 I have this code snippet, which works great somewhere else, but gives me a circular reference error when I move it to a different section. I can't even find a good reference on what a circular reference is anywhere. // Create a new array to hold each of the Properties from the custom search pane // This array will eventually be converted to JSON and become a List<Property> propertyTables = []; // Create new Object to hold a row - we have to construct these // Property objects manually for

问题 I'm dealing with a set of tables in a database that appear to have a circular relationship (see image). This is the ARTS database if that is of any help to anyone. A user signing on: a) must create a (insert into) session, which in turn needs a SessionStartTransactionID (=SignOnTransaction) b) a SignOnTransaction is a type of ControlTransaction c) a ControlTransaciton is a type of Transaction d) a Transaction needs a reference to an existing Session (along with Operator, etc.) Note: The

问题 I have a question about how to avoid circular references and stackoverflows. I have a User object and another News Object (with a User variable). I need a Comments object (that already has a News variable), but I also need that it has a reference to the User that has created the Comment. If I create a User variable inside my Comment object I will have circular references and stackoverflows, so I think that I should only incluide a variable like userid in my Comment object. So it could be that

问题 I'm getting this error at angular service's map method but my returned datas doesn't seem to contain any circular reference, here is my json object: [{"id":14, "sender": {"id":20,"email":"p.martelliere@gmail.com","username":"test5","roles": ["ROLE_USER"],"status":"active","note":"0","points":0, "devices":[],"job":"Caisse","showJob":false,"notificationsActivated":true, "connected":true,"tokenConfirm":"","birthDate":[] },"receiver": {"id":12,"email":"test2@yopmail.com","username":"test2",