fix: support query variable binding (#6)

Closes #5

Author: vedmalex

src/addDirectiveResolveFunctionsToSchema.js

@@ -20,33 +20,33 @@ function createAsyncResolver(field) {
     originalResolver(source, args, context, info)
 }
 
-function getDirectiveInfo(directive, resolverMap, schema, location) {
+function getDirectiveInfo(directive, resolverMap, schema, location, variables) {
   const name = directive.name.value
 
   const Directive = schema.getDirective(name)
   if (typeof Directive === 'undefined') {
     throw new Error(
       `Directive @${name} is undefined. ` +
-        'Please define in schema before using.',
+      'Please define in schema before using.',
     )
   }
 
   if (!Directive.locations.includes(location)) {
     throw new Error(
       `Directive @${name} is not marked to be used on "${location}" location. ` +
-        `Please add "directive @${name} ON ${location}" in schema.`,
+      `Please add "directive @${name} ON ${location}" in schema.`,
     )
   }
 
   const resolver = resolverMap[name]
   if (!resolver && !BUILT_IN_DIRECTIVES.includes(name)) {
     throw new Error(
       `Directive @${name} has no resolver.` +
-        'Please define one using createFieldExecutionResolver().',
+      'Please define one using createFieldExecutionResolver().',
     )
   }
 
-  const args = getDirectiveValues(Directive, { directives: [directive] })
+  const args = getDirectiveValues(Directive, { directives: [directive] }, variables)
   return { args, resolver }
 }
 
@@ -60,14 +60,13 @@ function createFieldExecutionResolver(field, resolverMap, schema) {
       schema,
       DirectiveLocation.FIELD_DEFINITION,
     )
-    return (source, args, context, info) =>
-      directiveInfo.resolver(
-        () => recursiveResolver(source, args, context, info),
-        source,
-        directiveInfo.args,
-        context,
-        info,
-      )
+    return (source, args, context, info) => directiveInfo.resolver(
+      () => recursiveResolver(source, args, context, info),
+      source,
+      directiveInfo.args,
+      context,
+      info,
+    )
   }, createAsyncResolver(field))
 }
 
@@ -83,6 +82,7 @@ function createFieldResolver(field, resolverMap, schema) {
         resolverMap,
         schema,
         DirectiveLocation.FIELD,
+        info.variableValues,
       )
       return () =>
         directiveInfo.resolver(

src/addDirectiveResolveFunctionsToSchema.test.js

@@ -1,10 +1,11 @@
 /* eslint-disable no-shadow */
+import url from 'url';
 import { makeExecutableSchema } from 'graphql-tools'
 import { graphql } from 'graphql'
 import { addDirectiveResolveFunctionsToSchema } from './'
 
-const run = async (schema, query, context) => {
-  const { data, errors } = await graphql(schema, query, null, context)
+const run = async (schema, query, context, variables) => {
+  const { data, errors } = await graphql(schema, query, null, context, variables)
   if (errors && errors.length) {
     /* eslint-disable no-console */
     console.error(errors)
@@ -77,6 +78,7 @@ describe('addDirectiveResolveFunctionsToSchema', () => {
         getFieldName(resolve, source, directiveArgs, context, info) {
           return info.fieldName
         },
+
       }
 
       schema = makeExecutableSchema({ typeDefs, resolvers })
@@ -260,6 +262,7 @@ describe('addDirectiveResolveFunctionsToSchema', () => {
         directive @prefixWithId on FIELD
         directive @getContextKey(key: String!) on FIELD
         directive @getFieldName on FIELD
+        directive @url(root: String!) on FIELD
 
         type Query {
           foo: String
@@ -304,6 +307,9 @@ describe('addDirectiveResolveFunctionsToSchema', () => {
         getFieldName(resolve, source, directiveArgs, context, info) {
           return info.fieldName
         },
+        async url(resolve, source, directiveArgs) {
+          return url.resolve(directiveArgs.root, await resolve())
+        },
       }
 
       schema = makeExecutableSchema({ typeDefs, resolvers })
@@ -391,5 +397,11 @@ describe('addDirectiveResolveFunctionsToSchema', () => {
       const data = await run(schema, query)
       expect(data).toEqual({ foo: 'foo' })
     })
+
+    it('should support query variables binding', async () => {
+      const query = /* GraphQL */ `query($url: String!) { foo @url(root:$url) }`
+      const data = await run(schema, query, null, { url: '/root/url/' })
+      expect(data).toEqual({ foo: '/root/url/foo' })
+    })
   })
 })