README.md

@@ -124,6 +124,45 @@ If you want to get multiple related models, just pass multiple `include` paramet
 Team.findAll({include: [City, Uniform]})
 ```
 
+## `limit` and `offset` queries
+Restricting list (`GET`) and scope queries to a restricted count can be done by passing `limit=<number>` and/or `offset=<number>`.
+
+```js
+// returns 10 teams starting from the 10th
+// GET /teams?limit=10&offset=10
+
+// results in a Sequelize query:
+Team.findAll({limit: 10, offset: 10})
+```
+
+## `order` queries
+You can change the order of the resulting query by passing `order` to the query.
+
+```js
+// returns the teams ordered by the name column
+// GET /teams?order[]=name
+
+// results in a Sequelize query:
+Team.findAll({order: ['name']})
+```
+
+```js
+// returns the teams ordered by the name column, descending
+// GET /teams?order[0]=name&order[0]=DESC
+
+// results in a Sequelize query:
+Team.findAll({order: [['name', 'DESC']]})
+```
+
+```js
+// returns the teams ordered by the name, then the city columns, descending
+// GET /teams?order[0]=name&order[1]=city
+
+// results in a Sequelize query:
+Team.findAll({order: [['name'], ['city']]})
+```
+
+
 ## Authorization and other hooks
 You can use Hapi's [`ext` option](http://hapijs.com/api#route-options) to interact with the request both before and after this module does. This is useful if you want to enforce authorization, or modify the request before or after this module does. Hapi [has a full list of hooks](http://hapijs.com/api#request-lifecycle) you can use.
 

src/crud.js

@@ -2,7 +2,7 @@ import joi from 'joi';
 import path from 'path';
 import error from './error';
 import _ from 'lodash';
-import { parseInclude, parseWhere } from './utils';
+import { parseInclude, parseWhere, parseLimitAndOffset, parseOrder } from './utils';
 import { notFound } from 'boom';
 import * as associations from './associations/index';
 import getConfigForMethod from './get-config-for-method.js';
@@ -144,11 +144,13 @@ export const list = ({ server, model, prefix = '/', config }) => {
     async handler(request, reply) {
       const include = parseInclude(request);
       const where = parseWhere(request);
+      const { limit, offset } = parseLimitAndOffset(request);
+      const order = parseOrder(request);
 
       if (include instanceof Error) return void reply(include);
 
       const list = await model.findAll({
-        where, include,
+        where, include, limit, offset, order,
       });
 
       reply(list.map((item) => item.toJSON()));
@@ -191,10 +193,14 @@ export const scope = ({ server, model, prefix = '/', config }) => {
     async handler(request, reply) {
       const include = parseInclude(request);
       const where = parseWhere(request);
+      const { limit, offset } = parseLimitAndOffset(request);
+      const order = parseOrder(request);
 
       if (include instanceof Error) return void reply(include);
 
-      const list = await model.scope(request.params.scope).findAll({ include, where });
+      const list = await model.scope(request.params.scope).findAll({
+        include, where, limit, offset, order,
+      });
 
       reply(list.map((item) => item.toJSON()));
     },

src/crud.test.js

@@ -37,7 +37,7 @@ test.beforeEach('setup request stub', (t) => {
   t.context.request = {
     query: {},
     payload: {},
-    models: [t.context.model],
+    models: t.context.models,
   };
 });
 
@@ -157,3 +157,75 @@ test('crud#list handler if parseInclude errors', async (t) => {
     'responds with a Boom error'
   );
 });
+
+test('crud#list handler with limit', async (t) => {
+  const { server, model, request, reply, models } = t.context;
+  const { findAll } = model;
+
+  // set the limit
+  request.query.limit = 1;
+
+  list({ server, model });
+  const { handler } = server.route.args[0][0];
+  model.findAll.resolves(models);
+
+  try {
+    await handler(request, reply);
+  } catch (e) {
+    t.ifError(e, 'does not error while handling');
+  } finally {
+    t.pass('does not error while handling');
+  }
+
+  t.truthy(
+    reply.calledOnce
+    , 'calls reply only once'
+  );
+
+  const response = reply.args[0][0];
+  const findAllArgs = findAll.args[0][0];
+
+  t.falsy(response instanceof Error, response);
+
+  t.is(
+    findAllArgs.limit,
+    request.query.limit,
+    'queries with the limit'
+  );
+});
+
+test('crud#list handler with order', async (t) => {
+  const { server, model, request, reply, models } = t.context;
+  const { findAll } = model;
+
+  // set the limit
+  request.query.order = 'key';
+
+  list({ server, model });
+  const { handler } = server.route.args[0][0];
+  model.findAll.resolves(models);
+
+  try {
+    await handler(request, reply);
+  } catch (e) {
+    t.ifError(e, 'does not error while handling');
+  } finally {
+    t.pass('does not error while handling');
+  }
+
+  t.truthy(
+    reply.calledOnce
+    , 'calls reply only once'
+  );
+
+  const response = reply.args[0][0];
+  const findAllArgs = findAll.args[0][0];
+
+  t.falsy(response instanceof Error, response);
+
+  t.deepEqual(
+    findAllArgs.order,
+    [request.query.order],
+    'queries with the order as an array b/c that\'s what sequelize wants'
+  );
+});

src/get-config-for-method.js

@@ -66,6 +66,11 @@ export const idParamsMethods = [
   'update',
 ];
 
+export const restrictMethods = [
+  'list',
+  'scope',
+];
+
 export default ({
   method, attributeValidation, associationValidation, scopes = [], config = {},
 }) => {
@@ -74,6 +79,7 @@ export default ({
   const hasPayload = payloadMethods.includes(method);
   const hasScopeParams = scopeParamsMethods.includes(method);
   const hasIdParams = idParamsMethods.includes(method);
+  const hasRestrictMethods = restrictMethods.includes(method);
   // clone the config so we don't modify it on multiple passes.
   let methodConfig = { ...config, validate: { ...config.validate } };
 
@@ -133,5 +139,18 @@ export default ({
     methodConfig = set(methodConfig, 'validate.params', params);
   }
 
+  if (hasRestrictMethods) {
+    const query = concatToJoiObject(joi.object()
+      .keys({
+        limit: joi.number().min(0).integer(),
+        offset: joi.number().min(0).integer(),
+        order: joi.array(),
+      }),
+      get(methodConfig, 'validate.query')
+    );
+
+    methodConfig = set(methodConfig, 'validate.query', query);
+  }
+
   return methodConfig;
 };

src/get-config-for-method.test.js

@@ -7,6 +7,7 @@ import
   payloadMethods,
   scopeParamsMethods,
   idParamsMethods,
+  restrictMethods,
   sequelizeOperators,
 } from './get-config-for-method.js';
 
@@ -468,6 +469,101 @@ test('validate.payload idParamsMethods', (t) => {
   });
 });
 
+test('validate.query restrictMethods', (t) => {
+  restrictMethods.forEach((method) => {
+    const configForMethod = getConfigForMethod({ method });
+    const { query } = configForMethod.validate;
+    const restrictKeys = ['limit', 'offset'];
+
+    restrictKeys.forEach((key) => {
+      t.ifError(
+        query.validate({ [key]: 0 }).error
+        , `applies restriction (${key}) to validate.query`
+      );
+    });
+
+    t.ifError(
+      query.validate({ order: ['thing', 'DESC'] }).error
+      , 'applies `order` to validate.query'
+    );
+
+    t.truthy(
+      query.validate({ notAThing: true }).error
+      , 'errors on a non-valid key'
+    );
+  });
+});
+
+test('validate.query restrictMethods w/ config as plain object', (t) => {
+  const config = {
+    validate: {
+      query: {
+        aKey: joi.boolean(),
+      },
+    },
+  };
+
+  restrictMethods.forEach((method) => {
+    const configForMethod = getConfigForMethod({
+      method,
+      config,
+    });
+    const { query } = configForMethod.validate;
+
+    const keys = [
+      ...Object.keys(config.validate.query),
+    ];
+
+    keys.forEach((key) => {
+      t.ifError(
+        query.validate({ [key]: true }).error
+        , `applies ${key} to validate.query`
+      );
+    });
+
+    t.truthy(
+      query.validate({ notAThing: true }).error
+      , 'errors on a non-valid key'
+    );
+  });
+});
+
+test('validate.query restrictMethods w/ config as joi object', (t) => {
+  const queryKeys = {
+    aKey: joi.boolean(),
+  };
+  const config = {
+    validate: {
+      query: joi.object().keys(queryKeys),
+    },
+  };
+
+  whereMethods.forEach((method) => {
+    const configForMethod = getConfigForMethod({
+      method,
+      config,
+    });
+    const { query } = configForMethod.validate;
+
+    const keys = [
+      ...Object.keys(queryKeys),
+    ];
+
+    keys.forEach((key) => {
+      t.ifError(
+        query.validate({ [key]: true }).error
+        , `applies ${key} to validate.query`
+      );
+    });
+
+    t.truthy(
+      query.validate({ notAThing: true }).error
+      , 'errors on a non-valid key'
+    );
+  });
+});
+
+
 test('does not modify initial config on multiple passes', (t) => {
   const { config } = t.context;
   const originalConfig = { ...config };

src/utils.js

@@ -1,9 +1,13 @@
-import { omit, identity } from 'lodash';
+import { omit, identity, toNumber, isString, isUndefined } from 'lodash';
 import { notImplemented } from 'boom';
 
+const sequelizeKeys = ['include', 'order', 'limit', 'offset'];
+
 export const parseInclude = request => {
-  const include = Array.isArray(request.query.include) ? request.query.include
-                                                       : [request.query.include];
+  const include = Array.isArray(request.query.include)
+    ? request.query.include
+    : [request.query.include]
+    ;
 
   const noGetDb = typeof request.getDb !== 'function';
   const noRequestModels = !request.models;
@@ -27,7 +31,7 @@ export const parseInclude = request => {
 };
 
 export const parseWhere = request => {
-  const where = omit(request.query, 'include');
+  const where = omit(request.query, sequelizeKeys);
 
   for (const key of Object.keys(where)) {
     try {
@@ -40,6 +44,38 @@ export const parseWhere = request => {
   return where;
 };
 
+export const parseLimitAndOffset = (request) => {
+  const { limit, offset } = request.query;
+  const out = {};
+  if (!isUndefined(limit)) {
+    out.limit = toNumber(limit);
+  }
+  if (!isUndefined(offset)) {
+    out.offset = toNumber(offset);
+  }
+  return out;
+};
+
+export const parseOrder = (request) => {
+  const { order } = request.query;
+
+  if (!order) return null;
+
+  // transform to an array so sequelize will escape the input for us and
+  // maintain security. See http://docs.sequelizejs.com/en/latest/docs/querying/#ordering
+  if (isString(order)) return order.split(' ');
+
+  for (const key of Object.keys(order)) {
+    try {
+      order[key] = JSON.parse(order[key]);
+    } catch (e) {
+      //
+    }
+  }
+
+  return order;
+};
+
 export const getMethod = (model, association, plural = true, method = 'get') => {
   const a = plural ? association.original.plural : association.original.singular;
   const b = plural ? association.original.singular : association.original.plural; // alternative

src/utils.test.js

@@ -0,0 +1,113 @@
+import test from 'ava';
+import { parseLimitAndOffset, parseOrder, parseWhere } from './utils.js';
+
+test.beforeEach((t) => {
+  t.context.request = { query: {} };
+});
+
+test('parseLimitAndOffset is a function', (t) => {
+  t.is(typeof parseLimitAndOffset, 'function');
+});
+
+test('parseLimitAndOffset returns limit and offset', (t) => {
+  const { request } = t.context;
+  request.query.limit = 1;
+  request.query.offset = 2;
+  request.query.thing = 'hi';
+
+  t.is(
+    parseLimitAndOffset(request).limit
+    , request.query.limit
+  );
+
+  t.is(
+    parseLimitAndOffset(request).offset
+    , request.query.offset
+  );
+});
+
+test('parseLimitAndOffset returns limit and offset as numbers', (t) => {
+  const { request } = t.context;
+  const limit = 1;
+  const offset = 2;
+  request.query.limit = `${limit}`;
+  request.query.offset = `${offset}`;
+  request.query.thing = 'hi';
+
+  t.is(
+    parseLimitAndOffset(request).limit
+    , limit
+  );
+
+  t.is(
+    parseLimitAndOffset(request).offset
+    , offset
+  );
+});
+
+test('parseOrder is a function', (t) => {
+  t.is(typeof parseOrder, 'function');
+});
+
+test('parseOrder returns order when a string', (t) => {
+  const { request } = t.context;
+  const order = 'thing';
+  request.query.order = order;
+  request.query.thing = 'hi';
+
+  t.deepEqual(
+    parseOrder(request)
+    , [order]
+  );
+});
+
+test('parseOrder returns order when json', (t) => {
+  const { request } = t.context;
+  const order = [{ model: 'User' }, 'DESC'];
+  request.query.order = [JSON.stringify({ model: 'User' }), 'DESC'];
+  request.query.thing = 'hi';
+
+  t.deepEqual(
+    parseOrder(request)
+    , order
+  );
+});
+
+test('parseOrder returns null when not defined', (t) => {
+  const { request } = t.context;
+  request.query.thing = 'hi';
+
+  t.is(
+    parseOrder(request)
+    , null
+  );
+});
+
+
+test('parseWhere is a function', (t) => {
+  t.is(typeof parseWhere, 'function');
+});
+
+test('parseWhere returns the non-sequelize keys', (t) => {
+  const { request } = t.context;
+  request.query.order = 'thing';
+  request.query.include = 'User';
+  request.query.limit = 2;
+  request.query.thing = 'hi';
+
+  t.deepEqual(
+    parseWhere(request)
+    , { thing: 'hi' }
+  );
+});
+
+test('parseWhere returns json converted keys', (t) => {
+  const { request } = t.context;
+  request.query.order = 'hi';
+  request.query.thing = '{"id": {"$in": [2, 3]}}';
+
+  t.deepEqual(
+    parseWhere(request)
+    , { thing: { id: { $in: [2, 3] } } }
+  );
+});