Circular structure

j.s. — Sun, 31 Jan 2016 03:16:09 +0000

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Bidirectional Associations in Plain JS

I have been going through the tutorial and the code and it has been a great learning experience. I have found something and wonder if you could comment when you have a few minutes to spare! :)

Going through the book application in pure JavaScript, if I issue this command:

JSON.stringify(slots)

I get this:

"{"isbn":"0553345842","title":"The Mind's I","year":"1982","publisherIdRef":"Bantam Books","authorsIdRefToAdd":["3"]}"

However, If i try to use the book object:

JSON.stringify(book)

I get this error:

VM419:1 Uncaught TypeError: Converting circular structure to JSON(…)

Checking the runtime code with the debugger, as in the following screenshot,

I understand that we are using references to objects and so the circular reference: book ==> authors ==> authored books ==> book, etc.

Can this be a bad thing if we have a book published by a major publishing company with thousands of boos published?

Should we just use a ‘foreign’ key to the publisher instead of an object reference?

Thank you,
Everardo

web-engineering.info - Bidirectional Associations in Plain JS

Circular structure

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