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"articleBody":"This post is part of a series where I'm hoping to prove to myself that building a dynamic website with NodeJS is much more fun than using a CMS platform. See the first post for an explanation of why\n\nThe code can be found on GitHub\n\nPrevious Post\n\nThe first step is always (or at least should be) to take a step back and decide what to actually do…\n\n\n\nIn the last post the decision was made to store one document per page, and to have a unique index on the documents name property. This fits with a PUT request\n\nCallers of a PUT method should anticipate the calls are idempotent and made to the URL of a given resource. That is we'll be sending data to /pages/pageName and not /pages and repeatedly sending the same document for storage means that the document should be updated not duplicated.\n\nTests\nThis feature requires a set of conditions are tested:\n\n\tyou can't PUT an empty page\n\tif you PUT a new page you receive a 201\n\tif you PUT an existing page you receive a 200\n\tthe inserted or updated resource URL is in the location header of the response\n\n\ndescribe('PUTing pages', function() {\n it('should 400 when no body');\n\n describe('with new name', function(){\n it('respond with 201 status');\n });\n\n describe('with existing name', function(){\n it('respond with 200 status');\n });\n});\n\n\nAfter a little backwards and forwards the tests ended up as:\n\nvar request = require('supertest');\nvar should = require('should');\n\nvar server;\nvar db;\n\nbeforeEach(function() {\n //set environment to test and init things\n process.env.NODE_ENV = 'test'; \n db = require('../server/db');\n server = require('../server').app;\n});\n\ndescribe('PUTing pages', function() {\n it('should 400 when no body', function(done) {\n request(server)\n .put('/pages/newPage')\n .set('Accept', 'text/json')\n .expect('Content-Type', /json/)\n .expect(400, done);\n });\n\n describe('with a new page name', function(){\n beforeEach(function() {\n db.pages.remove({}, false, function(err, doc) {});\n });\n\n it('should respond with 201 status', function(done){\n request(server)\n .put('/pages/newPage')\n .send({name:'newPage', url:'/somewhere'})\n .set('Accept', 'text/json')\n .expect('Content-Type', /json/)\n .expect('location', '/somewhere')\n .expect(201, done);\n });\n\n });\n\n describe('with an existing page name', function(){\n beforeEach(function() {\n db.pages.remove({}, false, function(err, doc) {});\n db.pages.insert({name:'existingPage'}, function(err, docs){});\n });\n\n it('should respond with 200 status', function(done){\n request(server)\n .put('/pages/existingPage')\n .send({name:'existingPage', url:'/somewhereElse'})\n .set('Accept', 'text/json')\n .expect('Content-Type', /json/)\n .expect('location', '/somewhereElse')\n .expect(200, done);\n });\n\n });\n});\n\n\nand an alteration to the server file to make those tests pass:\n\napp.put('/pages/:page', function(req, res, next) {\n var pageName = req.params.page;\n if(!req.body || Object.getOwnPropertyNames(req.body).length === 0) {\n return res.json(400, {});\n }\n db.pages.findAndModify({\n query: { name: pageName },\n update: { $set: req.body },\n upsert: true,\n new: true\n }, function(err, doc, lastErrorObject) {\n if(err) {\n next(err);\n } else {\n res.location(doc.url || '/');\n if(lastErrorObject.updatedExisting) {\n res.json(200, {}); \n } else {\n res.json(201,{}); \n }\n }\n });\n});\n\n\nAgain this code feels a bit ugly to me… there's a lot bunched up together - but it can be revisited as it's covered by tests. Importantly it works and allows storage of new pages and edits to existing pages\n\nAnd, yes, I know that any unauthorised user can edit with this… authentication is still to come!\n"
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<div class="date">Wed Apr 23 2014</div>
<h1 class="title leading-10 pt-2 mb-0 mt-1">Websites != CMS Platform - Storing Data - Part 2</h1>
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<p>This post is part of a series where I'm hoping to prove to myself that building a dynamic website with NodeJS is much more fun than using a CMS platform. <a href="/2014/02/websites-cms.html">See the first post for an explanation of why</a></p>
<p>The code can be found on <a href="https://github.com/pauldambra/omniclopse">GitHub</a></p>
<p><a href="/Websites-CMS-Platform-Storing-Data.html">Previous Post</a></p>
<p>The first step is always (or at least should be) to take a step back and decide what to actually do…</p>
<!--more-->
<p>In the last post the decision was made to store one document per page, and to have a unique index on the documents name property. This fits with a PUT request</p>
<p><a href="http://stackoverflow.com/a/630475/222163">Callers of a PUT method should anticipate the calls are idempotent and made to the URL of a given resource</a>. That is we'll be sending data to <code class="language-plaintext highlighter-rouge">/pages/pageName</code> and not <code class="language-plaintext highlighter-rouge">/pages</code> and repeatedly sending the same document for storage means that the document should be updated not duplicated.</p>
<h2 id="tests">Tests</h2>
<p>This feature requires a set of conditions are tested:</p>
<ul>
<li>you can't PUT an empty page</li>
<li>if you PUT a new page you receive a 201</li>
<li>if you PUT an existing page you receive a 200</li>
<li>the inserted or updated resource URL is in the location header of the response</li>
</ul>
<div class="language-js highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nf">describe</span><span class="p">(</span><span class="dl">'</span><span class="s1">PUTing pages</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nf">it</span><span class="p">(</span><span class="dl">'</span><span class="s1">should 400 when no body</span><span class="dl">'</span><span class="p">);</span>
<span class="nf">describe</span><span class="p">(</span><span class="dl">'</span><span class="s1">with new name</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(){</span>
<span class="nf">it</span><span class="p">(</span><span class="dl">'</span><span class="s1">respond with 201 status</span><span class="dl">'</span><span class="p">);</span>
<span class="p">});</span>
<span class="nf">describe</span><span class="p">(</span><span class="dl">'</span><span class="s1">with existing name</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(){</span>
<span class="nf">it</span><span class="p">(</span><span class="dl">'</span><span class="s1">respond with 200 status</span><span class="dl">'</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
</code></pre></div></div>
<p>After a little backwards and forwards the tests ended up as:</p>
<div class="language-js highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="kd">var</span> <span class="nx">request</span> <span class="o">=</span> <span class="nf">require</span><span class="p">(</span><span class="dl">'</span><span class="s1">supertest</span><span class="dl">'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">should</span> <span class="o">=</span> <span class="nf">require</span><span class="p">(</span><span class="dl">'</span><span class="s1">should</span><span class="dl">'</span><span class="p">);</span>
<span class="kd">var</span> <span class="nx">server</span><span class="p">;</span>
<span class="kd">var</span> <span class="nx">db</span><span class="p">;</span>
<span class="nf">beforeEach</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="c1">//set environment to test and init things</span>
<span class="nx">process</span><span class="p">.</span><span class="nx">env</span><span class="p">.</span><span class="nx">NODE_ENV</span> <span class="o">=</span> <span class="dl">'</span><span class="s1">test</span><span class="dl">'</span><span class="p">;</span>
<span class="nx">db</span> <span class="o">=</span> <span class="nf">require</span><span class="p">(</span><span class="dl">'</span><span class="s1">../server/db</span><span class="dl">'</span><span class="p">);</span>
<span class="nx">server</span> <span class="o">=</span> <span class="nf">require</span><span class="p">(</span><span class="dl">'</span><span class="s1">../server</span><span class="dl">'</span><span class="p">).</span><span class="nx">app</span><span class="p">;</span>
<span class="p">});</span>
<span class="nf">describe</span><span class="p">(</span><span class="dl">'</span><span class="s1">PUTing pages</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nf">it</span><span class="p">(</span><span class="dl">'</span><span class="s1">should 400 when no body</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">done</span><span class="p">)</span> <span class="p">{</span>
<span class="nf">request</span><span class="p">(</span><span class="nx">server</span><span class="p">)</span>
<span class="p">.</span><span class="nf">put</span><span class="p">(</span><span class="dl">'</span><span class="s1">/pages/newPage</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">set</span><span class="p">(</span><span class="dl">'</span><span class="s1">Accept</span><span class="dl">'</span><span class="p">,</span> <span class="dl">'</span><span class="s1">text/json</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="dl">'</span><span class="s1">Content-Type</span><span class="dl">'</span><span class="p">,</span> <span class="sr">/json/</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="mi">400</span><span class="p">,</span> <span class="nx">done</span><span class="p">);</span>
<span class="p">});</span>
<span class="nf">describe</span><span class="p">(</span><span class="dl">'</span><span class="s1">with a new page name</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(){</span>
<span class="nf">beforeEach</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">pages</span><span class="p">.</span><span class="nf">remove</span><span class="p">({},</span> <span class="kc">false</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">doc</span><span class="p">)</span> <span class="p">{});</span>
<span class="p">});</span>
<span class="nf">it</span><span class="p">(</span><span class="dl">'</span><span class="s1">should respond with 201 status</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">done</span><span class="p">){</span>
<span class="nf">request</span><span class="p">(</span><span class="nx">server</span><span class="p">)</span>
<span class="p">.</span><span class="nf">put</span><span class="p">(</span><span class="dl">'</span><span class="s1">/pages/newPage</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">send</span><span class="p">({</span><span class="na">name</span><span class="p">:</span><span class="dl">'</span><span class="s1">newPage</span><span class="dl">'</span><span class="p">,</span> <span class="na">url</span><span class="p">:</span><span class="dl">'</span><span class="s1">/somewhere</span><span class="dl">'</span><span class="p">})</span>
<span class="p">.</span><span class="nf">set</span><span class="p">(</span><span class="dl">'</span><span class="s1">Accept</span><span class="dl">'</span><span class="p">,</span> <span class="dl">'</span><span class="s1">text/json</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="dl">'</span><span class="s1">Content-Type</span><span class="dl">'</span><span class="p">,</span> <span class="sr">/json/</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="dl">'</span><span class="s1">location</span><span class="dl">'</span><span class="p">,</span> <span class="dl">'</span><span class="s1">/somewhere</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="mi">201</span><span class="p">,</span> <span class="nx">done</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="nf">describe</span><span class="p">(</span><span class="dl">'</span><span class="s1">with an existing page name</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(){</span>
<span class="nf">beforeEach</span><span class="p">(</span><span class="kd">function</span><span class="p">()</span> <span class="p">{</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">pages</span><span class="p">.</span><span class="nf">remove</span><span class="p">({},</span> <span class="kc">false</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">doc</span><span class="p">)</span> <span class="p">{});</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">pages</span><span class="p">.</span><span class="nf">insert</span><span class="p">({</span><span class="na">name</span><span class="p">:</span><span class="dl">'</span><span class="s1">existingPage</span><span class="dl">'</span><span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">docs</span><span class="p">){});</span>
<span class="p">});</span>
<span class="nf">it</span><span class="p">(</span><span class="dl">'</span><span class="s1">should respond with 200 status</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">done</span><span class="p">){</span>
<span class="nf">request</span><span class="p">(</span><span class="nx">server</span><span class="p">)</span>
<span class="p">.</span><span class="nf">put</span><span class="p">(</span><span class="dl">'</span><span class="s1">/pages/existingPage</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">send</span><span class="p">({</span><span class="na">name</span><span class="p">:</span><span class="dl">'</span><span class="s1">existingPage</span><span class="dl">'</span><span class="p">,</span> <span class="na">url</span><span class="p">:</span><span class="dl">'</span><span class="s1">/somewhereElse</span><span class="dl">'</span><span class="p">})</span>
<span class="p">.</span><span class="nf">set</span><span class="p">(</span><span class="dl">'</span><span class="s1">Accept</span><span class="dl">'</span><span class="p">,</span> <span class="dl">'</span><span class="s1">text/json</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="dl">'</span><span class="s1">Content-Type</span><span class="dl">'</span><span class="p">,</span> <span class="sr">/json/</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="dl">'</span><span class="s1">location</span><span class="dl">'</span><span class="p">,</span> <span class="dl">'</span><span class="s1">/somewhereElse</span><span class="dl">'</span><span class="p">)</span>
<span class="p">.</span><span class="nf">expect</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="nx">done</span><span class="p">);</span>
<span class="p">});</span>
<span class="p">});</span>
<span class="p">});</span>
</code></pre></div></div>
<p>and an alteration to the server file to make those tests pass:</p>
<div class="language-js highlighter-rouge"><div class="highlight"><pre class="highlight"><code><span class="nx">app</span><span class="p">.</span><span class="nf">put</span><span class="p">(</span><span class="dl">'</span><span class="s1">/pages/:page</span><span class="dl">'</span><span class="p">,</span> <span class="kd">function</span><span class="p">(</span><span class="nx">req</span><span class="p">,</span> <span class="nx">res</span><span class="p">,</span> <span class="nx">next</span><span class="p">)</span> <span class="p">{</span>
<span class="kd">var</span> <span class="nx">pageName</span> <span class="o">=</span> <span class="nx">req</span><span class="p">.</span><span class="nx">params</span><span class="p">.</span><span class="nx">page</span><span class="p">;</span>
<span class="k">if</span><span class="p">(</span><span class="o">!</span><span class="nx">req</span><span class="p">.</span><span class="nx">body</span> <span class="o">||</span> <span class="nb">Object</span><span class="p">.</span><span class="nf">getOwnPropertyNames</span><span class="p">(</span><span class="nx">req</span><span class="p">.</span><span class="nx">body</span><span class="p">).</span><span class="nx">length</span> <span class="o">===</span> <span class="mi">0</span><span class="p">)</span> <span class="p">{</span>
<span class="k">return</span> <span class="nx">res</span><span class="p">.</span><span class="nf">json</span><span class="p">(</span><span class="mi">400</span><span class="p">,</span> <span class="p">{});</span>
<span class="p">}</span>
<span class="nx">db</span><span class="p">.</span><span class="nx">pages</span><span class="p">.</span><span class="nf">findAndModify</span><span class="p">({</span>
<span class="na">query</span><span class="p">:</span> <span class="p">{</span> <span class="na">name</span><span class="p">:</span> <span class="nx">pageName</span> <span class="p">},</span>
<span class="na">update</span><span class="p">:</span> <span class="p">{</span> <span class="na">$set</span><span class="p">:</span> <span class="nx">req</span><span class="p">.</span><span class="nx">body</span> <span class="p">},</span>
<span class="na">upsert</span><span class="p">:</span> <span class="kc">true</span><span class="p">,</span>
<span class="na">new</span><span class="p">:</span> <span class="kc">true</span>
<span class="p">},</span> <span class="kd">function</span><span class="p">(</span><span class="nx">err</span><span class="p">,</span> <span class="nx">doc</span><span class="p">,</span> <span class="nx">lastErrorObject</span><span class="p">)</span> <span class="p">{</span>
<span class="k">if</span><span class="p">(</span><span class="nx">err</span><span class="p">)</span> <span class="p">{</span>
<span class="nf">next</span><span class="p">(</span><span class="nx">err</span><span class="p">);</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="nx">res</span><span class="p">.</span><span class="nf">location</span><span class="p">(</span><span class="nx">doc</span><span class="p">.</span><span class="nx">url</span> <span class="o">||</span> <span class="dl">'</span><span class="s1">/</span><span class="dl">'</span><span class="p">);</span>
<span class="k">if</span><span class="p">(</span><span class="nx">lastErrorObject</span><span class="p">.</span><span class="nx">updatedExisting</span><span class="p">)</span> <span class="p">{</span>
<span class="nx">res</span><span class="p">.</span><span class="nf">json</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="p">{});</span>
<span class="p">}</span> <span class="k">else</span> <span class="p">{</span>
<span class="nx">res</span><span class="p">.</span><span class="nf">json</span><span class="p">(</span><span class="mi">201</span><span class="p">,{});</span>
<span class="p">}</span>
<span class="p">}</span>
<span class="p">});</span>
<span class="p">});</span>
</code></pre></div></div>
<p>Again this code feels a bit ugly to me… there's a lot bunched up together - but it can be revisited as it's covered by tests. Importantly it works and allows storage of new pages and edits to existing pages</p>
<p>And, yes, I know that any unauthorised user can edit with this… authentication is still to come!</p>
</div>
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