Merge branch 'master' of github.com:coralproject/talk into plugin_examples

graph/hooks.js

@@ -3,6 +3,7 @@ const {
   GraphQLInterfaceType
 } = require('graphql');
 const debug = require('debug')('talk:graph:schema');
+const Joi = require('joi');
 
 /**
  * XXX taken from graphql-js: src/execution/execute.js, because that function
@@ -82,6 +83,8 @@ const decorateWithHooks = (schema, hooks) => forEachField(schema, (field, typeNa
       Object.keys(hooks).forEach((hook) => {
         switch (hook) {
         case 'pre':
+          Joi.assert(hooks.pre, Joi.func().maxArity(4));
+
           debug(`adding pre hook to resolver ${typeName}.${fieldName} from plugin '${plugin.name}'`);
 
           if (typeof hooks.pre !== 'function') {
@@ -91,6 +94,8 @@ const decorateWithHooks = (schema, hooks) => forEachField(schema, (field, typeNa
           acc.pre.push(hooks.pre);
           break;
         case 'post':
+          Joi.assert(hooks.pre, Joi.func().maxArity(5));
+
           debug(`adding post hook to resolver ${typeName}.${fieldName} from plugin '${plugin.name}'`);
 
           if (typeof hooks.post !== 'function') {
@@ -129,6 +134,9 @@ const decorateWithHooks = (schema, hooks) => forEachField(schema, (field, typeNa
       return;
     }
 
+    // Ensure it matches the format we expect.
+    Joi.assert(post, Joi.array().items(Joi.func().maxArity(3)), `invalid post hooks were found for ${typeName}.${fieldName}`);
+
     // Cache the original resolverType function.
     let resolveType = field.resolveType;
 

graph/resolvers/asset.js

@@ -1,4 +1,11 @@
 const Asset = {
+  lastComment({id}, _, {loaders: {Comments}}) {
+    return Comments.getByQuery({
+      asset_id: id,
+      limit: 1,
+      parent_id: null
+    }).then(data => data[0]);
+  },
   recentComments({id}, _, {loaders: {Comments}}) {
     return Comments.genRecentComments.load(id);
   },

graph/typeDefs.graphql

@@ -413,6 +413,9 @@ type Asset {
   # The URL that the asset is located on.
   url: String
 
+  # Returns last comment
+  lastComment: Comment
+
   # Returns recent comments
   recentComments: [Comment]