Support optional objects

[mfulton26]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.

Description

Add support for not specifying an optional object property.

Steps to Reproduce

1. Define a schema with a property of type object which is not required.
2. Render the schema on a react-jsonschema-form and attempt to not specify the optional object property.

https://jsfiddle.net/f2y3fq7L/19/

Expected behavior

Have some sort of checkbox or something to enable/disable specifying the optional object property.

Actual behavior

There is no apparent way to not specify the optional object property.

Version

0.42.0

[n1k0]

Yeah, I've worked on a patch to make fields collapsible in the past but it was discarded in favor of theming; maybe we'd want to resurect it at some point, as this use case still seems valid to me.

[elisechant]

@mfulton26 would the example from the docs work for you here? https://jsfiddle.net/69z2wepo/68259/

[mfulton26]

I suppose although it does alter the schema and it seems like a lot of overhead if I have many optional objects.

[dropdevcoding]

In fact the form actually also validates wrong in this case which is very annoying. When defining an optional object inside the schema which has required fields the required fields always get validated although the schema would allow the whole object not to be there. (#331)

[literarymachine]

I just had the same problem described here and in #331; a workaround seems to be to specify the property as type array with the object as its items and maxItems of 1: https://jsfiddle.net/z8b5s7t2/