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Preserve defaultValue literals #3810

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@yaacovCR yaacovCR commented Dec 31, 2022

#3074 rebased on main.

Depends on #3809

@leebyron comments from original PR (edited, hopefully correctly):

Fixes #3051

This change solves the problem of default values defined via SDL not always resolving correctly through introspection by preserving the original GraphQL literal in the schema definition. This changes argument and input field definitions defaultValue field from just the "value" to a new GraphQLDefaultValueUsage type which contains either (EDIT: but not both!) "value" and "literal" fields.

Here is the flow for how a default value defined in an SDL would be converted into a functional schema and back to an SDL:

Before this change:

(SDL) --parse-> (AST) --coerceInputLiteral--> (defaultValue config) --valueToAST--> (AST) --print --> (SDL)

coerceInputLiteral performs coercion which is a one-way function, and valueToAST is unsafe and set to be deprecated in #3049.

After this change:

(SDL) --parse-> (defaultValue literal config) --print --> (SDL)

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@yaacovCR yaacovCR added the PR: bug fix 🐞 requires increase of "patch" version number label Dec 31, 2022
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@yaacovCR yaacovCR force-pushed the default-value-literals-rebased branch from f7d4e56 to 4883f29 Compare December 31, 2022 19:52
@yaacovCR yaacovCR force-pushed the default-value-literals-rebased branch from 4883f29 to 023cd9c Compare January 1, 2023 19:36
@yaacovCR yaacovCR requested a review from leebyron January 2, 2023 12:21
@yaacovCR yaacovCR force-pushed the default-value-literals-rebased branch 5 times, most recently from cafef7b to 7a927c5 Compare February 6, 2023 12:52
@yaacovCR yaacovCR force-pushed the default-value-literals-rebased branch 2 times, most recently from c3fc46d to 0376313 Compare May 31, 2023 11:36
Implements graphql/graphql-spec#794

Adds:

* DOT punctuator in lexer
* Improvements to lexer errors around misuse of `.`
* Minor improvement to parser core which simplified this addition
* `SchemaCoordinate` node and `isSchemaCoodinate()` predicate
* Support in `print()` and `visit()`
* Added function `parseSchemaCoordinate()` since it is a parser entry point.
* Added function `resolveSchemaCoordinate()` and `resolveASTSchemaCoordinate()` which implement the semantics (name mirrored from `buildASTSchema`) as well as the return type `ResolvedSchemaElement`
* Defines a `GraphQLSchemaElement` base class which defines a `.coordinate` property and `toString`/`toJSON` methods.
* Adds base class to types, fields, arguments, input fields, enum values, and directives.
* Uses this in validation error printing string templates.
Removes `valueFromAST()` and adds `coerceInputLiteral()` as an additional export from `coerceInputValue`.

The implementation is almost exactly the same as `valueFromAST()` with a slightly more strict type signature and refactored tests to improve coverage (the file unit test has 100% coverage)

While this does not change any behavior, it could be breaking if you rely directly on the valueFromAST() method. Use `coerceInputLiteral()` as a direct replacement.
Fixes graphql#3051

This change solves the problem of default values defined via SDL not always resolving correctly through introspection by preserving the original GraphQL literal in the schema definition. This changes argument and input field definitions `defaultValue` field from just the "value" to a new `GraphQLDefaultValueUsage` type which contains either or both "value" and "literal" fields.

Since either of these fields may be set, new functions for resolving a value or literal from either have been added - `getLiteralDefaultValue` and `getCoercedDefaultValue` - these replace uses that either assumed a set value or were manually converting a value back to a literal.

Here is the flow for how a default value defined in an SDL would be converted into a functional schema and back to an SDL:

**Before this change:**

```
(SDL) --parse-> (AST) --coerceInputLiteral--> (defaultValue config) --valueToAST--> (AST) --print --> (SDL)
```

`coerceInputLiteral` performs coercion which is a one-way function, and `valueToAST` is unsafe and set to be deprecated in graphql#3049.

**After this change:**

```
(SDL) --parse-> (defaultValue literal config) --print --> (SDL)
```
@yaacovCR yaacovCR force-pushed the default-value-literals-rebased branch from 0376313 to 619c450 Compare March 20, 2024 11:01
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Default value declared via SDL may not introspect correctly
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