Dependencies
var {
graphql,
GraphQLSchema,
GraphQLObjectType,
GraphQLString,
GraphQLNonNull,
GraphQLInterfaceType,
GraphQLList,
} = require('graphql');
Link schema
var Link = new GraphQLObjectType({
name: 'link',
fields: () => ({
id: {
type: GraphQLString,
},
source: {
type: Link,
},
target: {
type: Link,
},
}),
});
REST api for links
var Query = new GraphQLObjectType({
name: 'query',
fields: {
link: {
type: Link,
args: {
id: {
type: new GraphQLNonNull(GraphQLString),
},
},
},
links: {
type: new GraphQLList(Link)
},
add: {
type: Link,
args: {
id: {
type: GraphQLString,
},
source: {
type: GraphQLString,
},
target: {
type: GraphQLString,
},
},
},
update: {
type: Link,
},
},
});
adapter part
resolvers, root schema definition, fake database
var schema = new GraphQLSchema({
query: Query,
});
// fake database
var links = [];
var resolvers = {};
resolvers.add = (args) => {
args.id = links.length;
links.push(args);
return resolvers.link(args);
};
resolvers.link = (args) => {
if (links[args.id]) {
return {
id: () => links[args.id].id,
source: () => resolvers.link({ id: links[args.id].source }),
target: () => resolvers.link({ id: links[args.id].target }),
};
}
};
resolvers.links = () => links.map((link) => resolvers.link(link));
requests
await graphql(schema, `
{
add {
id
}
}
`, resolvers).then();
await graphql(schema, `
{
add(source: "0") {
id
}
}
`, resolvers).then();
await graphql(schema, `
{
add(source: "1" target: "2") {
id
source {
id
}
target {
id
}
}
}
`, resolvers).then();
await graphql(schema, `
{
link(id: "2") {
id
source {
id
}
target {
id
}
}
}
`, resolvers).then();
await graphql(schema, `
{
links {
...link
}
}
fragment link on link {
id
source {
id
}
target {
id
}
}
`, resolvers).then();
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