Ensure the schema matches the models in ValidateSchema

[spawnia]

What problem does this feature proposal attempt to solve?

Large parts of our schema consists of type definitions that match our models. Calling php artisan lighthouse:validate-schema does not validate that fields line up correctly with the models attributes and relations.

Which possible solutions should be considered?

php artisan lighthouse:validate-schema should catch as many errors as possible.

First, we would need to identify which types should correspond to a model. That information can come from:

• explicit @model directive
• usage of the type in fields with directives that presume model usage, such as @all, @create

Validating that a type lines up with a model requires that Lighthouse is able to check if each field is able to be resolved. Possible resolvers are:

• explicit resolver directives
• attributes (requires PHPDoc annotations in the model)
• relations (requires type annotations on the relationship method, preferrably PHPDoc annotations with generic types)