Add queries/resolvers for single assets

index.js

@@ -1,4 +1,6 @@
-import {ApolloServer, gql} from 'apollo-server';
+import resolvers from './resolvers';
+import typeDefs from './schema';
+import {ApolloServer} from 'apollo-server';
 import {continents, countries, languages} from 'countries-list';
 
 function toArray(object) {
@@ -8,61 +10,18 @@ function toArray(object) {
   }));
 }
 
-const data = {
-  continents: Object.entries(continents).map(([code, name]) => ({code, name})),
-  countries: toArray(countries),
-  languages: toArray(languages)
-};
-
-const typeDefs = gql`
-  type Continent {
-    code: String
-    name: String
+const server = new ApolloServer({
+  typeDefs,
+  resolvers,
+  context: {
+    continents: Object.entries(continents).map(([code, name]) => ({
+      code,
+      name
+    })),
+    countries: toArray(countries),
+    languages: toArray(languages)
   }
-
-  type Country {
-    code: String
-    name: String
-    native: String
-    phone: String
-    continent: Continent
-    currency: String
-    languages: [Language]
-    emoji: String
-    emojiU: String
-  }
-
-  type Language {
-    code: String
-    name: String
-    native: String
-    rtl: Int
-  }
-
-  type Query {
-    continents: [Continent]
-    countries: [Country]
-    languages: [Language]
-  }
-`;
-
-const resolvers = {
-  Country: {
-    continent: country =>
-      data.continents.find(continent => continent.code === country.continent),
-    languages: country =>
-      data.languages.filter(language =>
-        country.languages.includes(language.code)
-      )
-  },
-  Query: {
-    continents: () => data.continents,
-    countries: () => data.countries,
-    languages: () => data.languages
-  }
-};
-
-const server = new ApolloServer({typeDefs, resolvers});
+});
 
 server.listen({port: process.env.PORT}).then(({url}) => {
   console.log(`🚀  Server ready at ${url}`);

resolvers.js

@@ -0,0 +1,21 @@
+function byCode(code) {
+  return item => item.code === code;
+}
+
+export default {
+  Country: {
+    continent: (country, args, {continents}) =>
+      continents.find(continent => continent.code === country.continent),
+    languages: (country, args, {languages}) =>
+      languages.filter(language => country.languages.includes(language.code))
+  },
+  Query: {
+    continent: (parent, args, {continents}) =>
+      continents.find(byCode(args.code)),
+    continents: (parent, args, {continents}) => continents,
+    country: (parent, args, {countries}) => countries.find(byCode(args.code)),
+    countries: (parent, args, {countries}) => countries,
+    language: (parent, args, {languages}) => languages.find(byCode(args.code)),
+    languages: (parent, args, {languages}) => languages
+  }
+};

schema.js

@@ -0,0 +1,36 @@
+import {gql} from 'apollo-server';
+
+export default gql`
+  type Continent {
+    code: String
+    name: String
+  }
+
+  type Country {
+    code: String
+    name: String
+    native: String
+    phone: String
+    continent: Continent
+    currency: String
+    languages: [Language]
+    emoji: String
+    emojiU: String
+  }
+
+  type Language {
+    code: String
+    name: String
+    native: String
+    rtl: Int
+  }
+
+  type Query {
+    continents: [Continent]
+    continent(code: String): Continent
+    countries: [Country]
+    country(code: String): Country
+    languages: [Language]
+    language(code: String): Language
+  }
+`;