No way to have optional data in GraphQL queries.

Description

I’m not sure this is a bug or a feature-request. It seems that while a specific <page-query> can have nullable GraphQL fields, if you want to query a source that you’ve personally defined it does not allow nullable entries.

Steps to reproduce

Using the gridsome/gridsome-starter-blog try and create a post without a cover image. The only way to do so is by rewriting the Page component (and Index etc) to not rely on the cover_image.

Expected result

It should be possible to mark fields as optional or nullable, or just natively support it.

Actual result

Module build failed (from ./node_modules/gridsome/lib/plugins/vue-components/lib/loaders/page-query.js):
Error: Cannot query field "cover_image" on type "Post".

GraphQL request (124:5)
123:     content
124:     cover_image (width: 860, blur: 10)
         ^
125:     meta_image (width: 860, blur: 10)

Environment

Libs:
- gridsome version: 0.6.2
- @gridsome/cli version: 0.1.1

Browser:
- [X] Chrome (desktop) version 74.0.3729.169
 
For Tooling issues:
- Node version: 12.0
- Platform:  Mac

[jltxwesley]

@Acidic9 you can create a Post that contains all the fields, just give it some random name and exclude it from showing up in your site. Better yet is if you have a Post that is actually used that contains all the fields, you just need 1.

Closing this though since it will be fixed in v0.7

Not sure if it’s fixed in v0.7? I am still experiencing the same issue.

[hjvedvik]

Gridsome can only generate the schema based on the data you have. We are working on APIs for letting you defined the schema yourself to make sure the cover_image always exists. It will be available in v0.7 😃