67 lines
No EOL
1.8 KiB
Markdown
67 lines
No EOL
1.8 KiB
Markdown
# graphql_schema
|
|
[](https://pub.dartlang.org/packages/graphql_schema)
|
|
|
|
An implementation of GraphQL's type system in Dart. Supports any platform where Dart runs.
|
|
|
|
# Usage
|
|
It's easy to define a schema with the
|
|
[helper functions](#helpers):
|
|
|
|
```dart
|
|
final GraphQLSchema todoSchema = new GraphQLSchema(
|
|
query: objectType('Todo', [
|
|
field('text', graphQLString.nonNullable()),
|
|
field('created_at', graphQLDate)
|
|
]));
|
|
```
|
|
|
|
All GraphQL types are generic, in order to leverage Dart's strong typing support.
|
|
|
|
# Serialization
|
|
GraphQL types can `serialize` and `deserialize` input data.
|
|
The exact implementation of this depends on the type.
|
|
|
|
```dart
|
|
var iso8601String = graphQLDate.serialize(new DateTime.now());
|
|
var date = graphQLDate.deserialize(iso8601String);
|
|
print(date.millisecondsSinceEpoch);
|
|
```
|
|
|
|
# Validation
|
|
GraphQL types can `validate` input data.
|
|
|
|
```dart
|
|
var validation = myType.validate('@root', {...});
|
|
|
|
if (validation.successful) {
|
|
doSomething(validation.value);
|
|
} else {
|
|
print(validation.errors);
|
|
}
|
|
```
|
|
|
|
# Helpers
|
|
* `graphQLSchema` - Create a `GraphQLSchema`
|
|
* `objectType` - Create a `GraphQLObjectType` with fields
|
|
* `field` - Create a `GraphQLField` with a type/argument/resolver
|
|
* `listType` - Create a `GraphQLListType` with the provided `innerType`
|
|
|
|
# Types
|
|
All of the GraphQL scalar types are built in, as well as a `Date` type:
|
|
* `graphQLString`
|
|
* `graphQLId`
|
|
* `graphQLBoolean`
|
|
* `graphQLInt`
|
|
* `graphQLFloat`
|
|
* `graphQLDate`
|
|
|
|
## Non-Nullable Types
|
|
You can easily make a type non-nullable by calling its `nonNullable` method.
|
|
|
|
## List Types
|
|
Support for list types is also included. Use the `listType` helper for convenience.
|
|
|
|
```dart
|
|
/// A non-nullable list of non-nullable integers
|
|
listType(graphQLInt.nonNullable()).nonNullable();
|
|
``` |