From 7b77236edd09babb461e1a00559be4167a58b9f9 Mon Sep 17 00:00:00 2001
From: Dmitry Maganov <vonagam@gmail.com>
Date: Wed, 3 Jul 2019 01:46:44 +0300
Subject: [PATCH] feat: adapter-commons: add `allowsMulti(method)` to
 AdapterService

---
 packages/adapter-commons/lib/service.js       | 32 +++++++---
 packages/adapter-commons/test/service.test.js | 58 +++++++++++++++++++
 2 files changed, 81 insertions(+), 9 deletions(-)

diff --git a/packages/adapter-commons/lib/service.js b/packages/adapter-commons/lib/service.js
index 9e6dfc76c6..efbf192af5 100644
--- a/packages/adapter-commons/lib/service.js
+++ b/packages/adapter-commons/lib/service.js
@@ -9,12 +9,10 @@ const callMethod = (self, name, ...args) => {
   return self[name](...args);
 };
 
-const checkMulti = (method, option) => {
-  if (option === true) {
-    return true;
-  }
-
-  return Array.isArray(option) ? option.includes(method) : false;
+const alwaysMulti = {
+  find: true,
+  get: false,
+  update: false
 };
 
 module.exports = class AdapterService {
@@ -48,6 +46,22 @@ module.exports = class AdapterService {
     return Object.assign(result, { paginate });
   }
 
+  allowsMulti (method) {
+    const always = alwaysMulti[method];
+
+    if (typeof always !== 'undefined') {
+      return always;
+    }
+
+    const option = this.options.multi;
+
+    if (option === true || option === false) {
+      return option;
+    } else {
+      return option.includes(method);
+    }
+  }
+
   find (params) {
     return callMethod(this, '_find', params);
   }
@@ -57,7 +71,7 @@ module.exports = class AdapterService {
   }
 
   create (data, params) {
-    if (Array.isArray(data) && !checkMulti('create', this.options.multi)) {
+    if (Array.isArray(data) && !this.allowsMulti('create')) {
       return Promise.reject(new MethodNotAllowed(`Can not create multiple entries`));
     }
 
@@ -75,7 +89,7 @@ module.exports = class AdapterService {
   }
 
   patch (id, data, params) {
-    if (id === null && !checkMulti('patch', this.options.multi)) {
+    if (id === null && !this.allowsMulti('patch')) {
       return Promise.reject(new MethodNotAllowed(`Can not patch multiple entries`));
     }
 
@@ -83,7 +97,7 @@ module.exports = class AdapterService {
   }
 
   remove (id, params) {
-    if (id === null && !checkMulti('remove', this.options.multi)) {
+    if (id === null && !this.allowsMulti('remove')) {
       return Promise.reject(new MethodNotAllowed(`Can not remove multiple entries`));
     }
 
diff --git a/packages/adapter-commons/test/service.test.js b/packages/adapter-commons/test/service.test.js
index 712cc771fb..c46185a4a7 100644
--- a/packages/adapter-commons/test/service.test.js
+++ b/packages/adapter-commons/test/service.test.js
@@ -133,4 +133,62 @@ describe('@feathersjs/adapter-commons/service', () => {
       query: { $something: 'else' }
     });
   });
+
+  it('allowsMulti', () => {
+    context('with true', () => {
+      const service = new AdapterService({multi: true});
+
+      it('does return true for multible methodes', () => {
+        assert.equal(service.allowsMulti('patch'), true);
+      });
+
+      it('does return false for always non-multible methodes', () => {
+        assert.equal(service.allowsMulti('update'), false);
+      });
+
+      it('does return true for unknown methods', () => {
+        assert.equal(service.allowsMulti('other'), true);
+      });
+    });
+
+    context('with false', () => {
+      const service = new AdapterService({multi: false});
+
+      it('does return false for multible methodes', () => {
+        assert.equal(service.allowsMulti('remove'), false);
+      });
+
+      it('does return true for always multible methodes', () => {
+        assert.equal(service.allowsMulti('find'), true);
+      });
+
+      it('does return false for unknown methods', () => {
+        assert.equal(service.allowsMulti('other'), false);
+      });
+    });
+
+    context('with array', () => {
+      const service = new AdapterService({multi: ['create', 'get', 'other']});
+
+      it('does return true for specified multible methodes', () => {
+        assert.equal(service.allowsMulti('create'), true);
+      });
+
+      it('does return false for non-specified multible methodes', () => {
+        assert.equal(service.allowsMulti('patch'), false);
+      });
+
+      it('does return false for specified always multible methodes', () => {
+        assert.equal(service.allowsMulti('get'), false);
+      });
+
+      it('does return true for specified unknown methodes', () => {
+        assert.equal(service.allowsMulti('other'), true);
+      });
+
+      it('does return false for non-specified unknown methodes', () => {
+        assert.equal(service.allowsMulti('another'), false);
+      });
+    });
+  });
 });