validation error when using format property

[locales-wellington]

Prerequisites

• [x ] 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

Introduction of ajv validation prevents form submission when using unknown 'format' property

Steps to Reproduce

https://jsfiddle.net/hdp1kgn6/1/

Add format: "textarea" to description and try and submit form

Expected behavior

I can add custom fields which will format ui based on format property in data and not prevent submission

eg.

description: {type: "string". format: "textarea"}

const fields = {
 customField: CustomFieldComponent
}
const uiFields = { desc: { 'ui:field': 'customField'  };

Actual behavior

Error on form submission (ajv validation)
Uncaught Error: unknown format "textarea" is used in schema at path "#/properties/description"

Version

1.0.x

You can usually get this information in your package.json or in the file URL if you're using the unpkg one.

[glasserc]

What does format: "textarea" mean? It's not one of the formats in the JSON Schema spec. We should probably throw an error as soon as you put that in a schema.

[locales-wellington]

7.2 "Implementations MAY add custom format attributes."
AJV allows the addition of custom formats https://github.com/epoberezkin/ajv#formats so it seems that it would be sensible to allow implementations using react-jsonschema-form to add these?

I am using ajv with react-jsonschema-form 0.51 and the 1.0.0 release breaks my implementation by not allowing that option.

[glasserc]

You can already add widgets for any format you like as part of the registry.

[locales-wellington]

But not custom formats in the schema correct? Because that will fail validation. For example: I have a schema that includes a format 'markup' for a string to display a markup editor. I should be able to add that custom format to the validator (ajv) so I don't get a validation error. The validator ajv that has been added provides that option so it seems odd that the react-schema-form api would not?

[glasserc]

Yes, someone using rjsf should be able to interact with the ajv validator directly. See #783, #794.

[locales-wellington]

Ah, righto - thanks :)