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Relevant Search: With Applications for Solr and Elasticsearch

For more in depth reading about search, ranking and generally everything you could ever want to know about how lucene, elasticsearch or solr work under the hood I highly suggest this book. Easily one of the most interesting technical books I have read in a long time. If you are tasked with solving search relevance problems even if not in Solr or Elasticsearch it should be your first reference. Amazon Affiliate Link
https://bitbucket.org/bo_hmb/bo_hmb
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389          
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396
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425  <div class="section" id="form-validation">
426<h1><a class="toc-backref" href="#id6">Form Validation</a><a class="headerlink" href="#form-validation" title="Permalink to this headline"></a></h1>
427<p>CodeIgniter provides a comprehensive form validation and data prepping
428class that helps minimize the amount of code you’ll write.</p>
429<div class="contents topic" id="page-contents">
430<p class="topic-title first">Page Contents</p>
431<ul class="simple">
432<li><a class="reference internal" href="#form-validation" id="id6">Form Validation</a><ul>
433<li><a class="reference internal" href="#overview" id="id7">Overview</a></li>
434<li><a class="reference internal" href="#form-validation-tutorial" id="id8">Form Validation Tutorial</a><ul>
435<li><a class="reference internal" href="#the-form" id="id9">The Form</a></li>
436<li><a class="reference internal" href="#the-success-page" id="id10">The Success Page</a></li>
437<li><a class="reference internal" href="#the-controller" id="id11">The Controller</a></li>
438<li><a class="reference internal" href="#try-it" id="id12">Try it!</a></li>
439<li><a class="reference internal" href="#explanation" id="id13">Explanation</a></li>
440<li><a class="reference internal" href="#setting-validation-rules" id="id14">Setting Validation Rules</a></li>
441<li><a class="reference internal" href="#setting-rules-using-an-array" id="id15">Setting Rules Using an Array</a></li>
442<li><a class="reference internal" href="#cascading-rules" id="id16">Cascading Rules</a></li>
443<li><a class="reference internal" href="#prepping-data" id="id17">Prepping Data</a></li>
444<li><a class="reference internal" href="#re-populating-the-form" id="id18">Re-populating the form</a></li>
445<li><a class="reference internal" href="#callbacks-your-own-validation-methods" id="id19">Callbacks: Your own Validation Methods</a></li>
446<li><a class="reference internal" href="#callable-use-anything-as-a-rule" id="id20">Callable: Use anything as a rule</a></li>
447<li><a class="reference internal" href="#setting-error-messages" id="id21">Setting Error Messages</a></li>
448<li><a class="reference internal" href="#translating-field-names" id="id22">Translating Field Names</a></li>
449<li><a class="reference internal" href="#changing-the-error-delimiters" id="id23">Changing the Error Delimiters</a></li>
450<li><a class="reference internal" href="#showing-errors-individually" id="id24">Showing Errors Individually</a></li>
451<li><a class="reference internal" href="#validating-an-array-other-than-post" id="id25">Validating an Array (other than $_POST)</a></li>
452</ul>
453</li>
454<li><a class="reference internal" href="#saving-sets-of-validation-rules-to-a-config-file" id="id26">Saving Sets of Validation Rules to a Config File</a><ul>
455<li><a class="reference internal" href="#how-to-save-your-rules" id="id27">How to save your rules</a></li>
456<li><a class="reference internal" href="#creating-sets-of-rules" id="id28">Creating Sets of Rules</a></li>
457<li><a class="reference internal" href="#calling-a-specific-rule-group" id="id29">Calling a Specific Rule Group</a></li>
458<li><a class="reference internal" href="#associating-a-controller-method-with-a-rule-group" id="id30">Associating a Controller Method with a Rule Group</a></li>
459</ul>
460</li>
461<li><a class="reference internal" href="#using-arrays-as-field-names" id="id31">Using Arrays as Field Names</a></li>
462<li><a class="reference internal" href="#rule-reference" id="id32">Rule Reference</a></li>
463<li><a class="reference internal" href="#prepping-reference" id="id33">Prepping Reference</a></li>
464<li><a class="reference internal" href="#class-reference" id="id34">Class Reference</a></li>
465<li><a class="reference internal" href="#helper-reference" id="id35">Helper Reference</a></li>
466</ul>
467</li>
468</ul>
469</div>
470<div class="section" id="overview">
471<h2><a class="toc-backref" href="#id7">Overview</a><a class="headerlink" href="#overview" title="Permalink to this headline"></a></h2>
472<p>Before explaining CodeIgniter’s approach to data validation, let’s
473describe the ideal scenario:</p>
474<ol class="arabic simple">
475<li>A form is displayed.</li>
476<li>You fill it in and submit it.</li>
477<li>If you submitted something invalid, or perhaps missed a required
478item, the form is redisplayed containing your data along with an
479error message describing the problem.</li>
480<li>This process continues until you have submitted a valid form.</li>
481</ol>
482<p>On the receiving end, the script must:</p>
483<ol class="arabic simple">
484<li>Check for required data.</li>
485<li>Verify that the data is of the correct type, and meets the correct
486criteria. For example, if a username is submitted it must be
487validated to contain only permitted characters. It must be of a
488minimum length, and not exceed a maximum length. The username can’t
489be someone else’s existing username, or perhaps even a reserved word.
490Etc.</li>
491<li>Sanitize the data for security.</li>
492<li>Pre-format the data if needed (Does the data need to be trimmed? HTML
493encoded? Etc.)</li>
494<li>Prep the data for insertion in the database.</li>
495</ol>
496<p>Although there is nothing terribly complex about the above process, it
497usually requires a significant amount of code, and to display error
498messages, various control structures are usually placed within the form
499HTML. Form validation, while simple to create, is generally very messy
500and tedious to implement.</p>
501</div>
502<div class="section" id="form-validation-tutorial">
503<h2><a class="toc-backref" href="#id8">Form Validation Tutorial</a><a class="headerlink" href="#form-validation-tutorial" title="Permalink to this headline"></a></h2>
504<p>What follows is a “hands on” tutorial for implementing CodeIgniters Form
505Validation.</p>
506<p>In order to implement form validation you’ll need three things:</p>
507<ol class="arabic simple">
508<li>A <a class="reference internal" href="../general/views.html"><span class="doc">View</span></a> file containing a form.</li>
509<li>A View file containing a “success” message to be displayed upon
510successful submission.</li>
511<li>A <a class="reference internal" href="../general/controllers.html"><span class="doc">controller</span></a> method to receive and
512process the submitted data.</li>
513</ol>
514<p>Let’s create those three things, using a member sign-up form as the
515example.</p>
516<div class="section" id="the-form">
517<h3><a class="toc-backref" href="#id9">The Form</a><a class="headerlink" href="#the-form" title="Permalink to this headline"></a></h3>
518<p>Using a text editor, create a form called myform.php. In it, place this
519code and save it to your application/views/ folder:</p>
520<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">html</span><span class="o">&gt;</span>
521<span class="o">&lt;</span><span class="nx">head</span><span class="o">&gt;</span>
522<span class="o">&lt;</span><span class="nx">title</span><span class="o">&gt;</span><span class="nx">My</span> <span class="nx">Form</span><span class="o">&lt;/</span><span class="nx">title</span><span class="o">&gt;</span>
523<span class="o">&lt;/</span><span class="nx">head</span><span class="o">&gt;</span>
524<span class="o">&lt;</span><span class="nx">body</span><span class="o">&gt;</span>
525
526<span class="o">&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nx">validation_errors</span><span class="p">();</span> <span class="cp">?&gt;</span>
527
528<span class="cp">&lt;?php</span> <span class="k">echo</span> <span class="nx">form_open</span><span class="p">(</span><span class="s1">&#39;form&#39;</span><span class="p">);</span> <span class="cp">?&gt;</span>
529
530<span class="p">&lt;</span><span class="nt">h5</span><span class="p">&gt;</span>Username<span class="p">&lt;/</span><span class="nt">h5</span><span class="p">&gt;</span>
531<span class="p">&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text&quot;</span> <span class="na">name</span><span class="o">=</span><span class="s">&quot;username&quot;</span> <span class="na">value</span><span class="o">=</span><span class="s">&quot;&quot;</span> <span class="na">size</span><span class="o">=</span><span class="s">&quot;50&quot;</span> <span class="p">/&gt;</span>
532
533<span class="p">&lt;</span><span class="nt">h5</span><span class="p">&gt;</span>Password<span class="p">&lt;/</span><span class="nt">h5</span><span class="p">&gt;</span>
534<span class="p">&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text&quot;</span> <span class="na">name</span><span class="o">=</span><span class="s">&quot;password&quot;</span> <span class="na">value</span><span class="o">=</span><span class="s">&quot;&quot;</span> <span class="na">size</span><span class="o">=</span><span class="s">&quot;50&quot;</span> <span class="p">/&gt;</span>
535
536<span class="p">&lt;</span><span class="nt">h5</span><span class="p">&gt;</span>Password Confirm<span class="p">&lt;/</span><span class="nt">h5</span><span class="p">&gt;</span>
537<span class="p">&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text&quot;</span> <span class="na">name</span><span class="o">=</span><span class="s">&quot;passconf&quot;</span> <span class="na">value</span><span class="o">=</span><span class="s">&quot;&quot;</span> <span class="na">size</span><span class="o">=</span><span class="s">&quot;50&quot;</span> <span class="p">/&gt;</span>
538
539<span class="p">&lt;</span><span class="nt">h5</span><span class="p">&gt;</span>Email Address<span class="p">&lt;/</span><span class="nt">h5</span><span class="p">&gt;</span>
540<span class="p">&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;text&quot;</span> <span class="na">name</span><span class="o">=</span><span class="s">&quot;email&quot;</span> <span class="na">value</span><span class="o">=</span><span class="s">&quot;&quot;</span> <span class="na">size</span><span class="o">=</span><span class="s">&quot;50&quot;</span> <span class="p">/&gt;</span>
541
542<span class="p">&lt;</span><span class="nt">div</span><span class="p">&gt;&lt;</span><span class="nt">input</span> <span class="na">type</span><span class="o">=</span><span class="s">&quot;submit&quot;</span> <span class="na">value</span><span class="o">=</span><span class="s">&quot;Submit&quot;</span> <span class="p">/&gt;&lt;/</span><span class="nt">div</span><span class="p">&gt;</span>
543
544<span class="p">&lt;/</span><span class="nt">form</span><span class="p">&gt;</span>
545
546<span class="p">&lt;/</span><span class="nt">body</span><span class="p">&gt;</span>
547<span class="p">&lt;/</span><span class="nt">html</span><span class="p">&gt;</span>
548</pre></div>
549</div>
550</div>
551<div class="section" id="the-success-page">
552<h3><a class="toc-backref" href="#id10">The Success Page</a><a class="headerlink" href="#the-success-page" title="Permalink to this headline"></a></h3>
553<p>Using a text editor, create a form called formsuccess.php. In it, place
554this code and save it to your application/views/ folder:</p>
555<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="nx">html</span><span class="o">&gt;</span>
556<span class="o">&lt;</span><span class="nx">head</span><span class="o">&gt;</span>
557<span class="o">&lt;</span><span class="nx">title</span><span class="o">&gt;</span><span class="nx">My</span> <span class="nx">Form</span><span class="o">&lt;/</span><span class="nx">title</span><span class="o">&gt;</span>
558<span class="o">&lt;/</span><span class="nx">head</span><span class="o">&gt;</span>
559<span class="o">&lt;</span><span class="nx">body</span><span class="o">&gt;</span>
560
561<span class="o">&lt;</span><span class="nx">h3</span><span class="o">&gt;</span><span class="nx">Your</span> <span class="nx">form</span> <span class="nx">was</span> <span class="nx">successfully</span> <span class="nx">submitted</span><span class="o">!&lt;/</span><span class="nx">h3</span><span class="o">&gt;</span>
562
563<span class="o">&lt;</span><span class="nx">p</span><span class="o">&gt;&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nx">anchor</span><span class="p">(</span><span class="s1">&#39;form&#39;</span><span class="p">,</span> <span class="s1">&#39;Try it again!&#39;</span><span class="p">);</span> <span class="cp">?&gt;</span><span class="p">&lt;/</span><span class="nt">p</span><span class="p">&gt;</span>
564
565<span class="p">&lt;/</span><span class="nt">body</span><span class="p">&gt;</span>
566<span class="p">&lt;/</span><span class="nt">html</span><span class="p">&gt;</span>
567</pre></div>
568</div>
569</div>
570<div class="section" id="the-controller">
571<h3><a class="toc-backref" href="#id11">The Controller</a><a class="headerlink" href="#the-controller" title="Permalink to this headline"></a></h3>
572<p>Using a text editor, create a controller called Form.php. In it, place
573this code and save it to your application/controllers/ folder:</p>
574<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span>
575
576<span class="k">class</span> <span class="nc">Form</span> <span class="k">extends</span> <span class="nx">CI_Controller</span> <span class="p">{</span>
577
578        <span class="k">public</span> <span class="k">function</span> <span class="nf">index</span><span class="p">()</span>
579        <span class="p">{</span>
580                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">helper</span><span class="p">(</span><span class="k">array</span><span class="p">(</span><span class="s1">&#39;form&#39;</span><span class="p">,</span> <span class="s1">&#39;url&#39;</span><span class="p">));</span>
581
582                <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">library</span><span class="p">(</span><span class="s1">&#39;form_validation&#39;</span><span class="p">);</span>
583
584                <span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">form_validation</span><span class="o">-&gt;</span><span class="na">run</span><span class="p">()</span> <span class="o">==</span> <span class="k">FALSE</span><span class="p">)</span>
585                <span class="p">{</span>
586                        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;myform&#39;</span><span class="p">);</span>
587                <span class="p">}</span>
588                <span class="k">else</span>
589                <span class="p">{</span>
590                        <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">view</span><span class="p">(</span><span class="s1">&#39;formsuccess&#39;</span><span class="p">);</span>
591                <span class="p">}</span>
592        <span class="p">}</span>
593<span class="p">}</span>
594</pre></div>
595</div>
596</div>
597<div class="section" id="try-it">
598<h3><a class="toc-backref" href="#id12">Try it!</a><a class="headerlink" href="#try-it" title="Permalink to this headline"></a></h3>
599<p>To try your form, visit your site using a URL similar to this one:</p>
600<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nx">example</span><span class="o">.</span><span class="nx">com</span><span class="o">/</span><span class="nx">index</span><span class="o">.</span><span class="nx">php</span><span class="o">/</span><span class="nx">form</span><span class="o">/</span>
601</pre></div>
602</div>
603<p>If you submit the form you should simply see the form reload. That’s
604because you haven’t set up any validation rules yet.</p>
605<p><strong>Since you haven’t told the Form Validation class to validate anything
606yet, it returns FALSE (boolean false) by default. ``The run()`` method
607only returns TRUE if it has successfully applied your rules without any
608of them failing.</strong></p>
609</div>
610<div class="section" id="explanation">
611<h3><a class="toc-backref" href="#id13">Explanation</a><a class="headerlink" href="#explanation" title="Permalink to this headline"></a></h3>
612<p>You’ll notice several things about the above pages:</p>
613<p>The form (myform.php) is a standard web form with a couple exceptions:</p>
614<ol class="arabic">
615<li><p class="first">It uses a form helper to create the form opening. Technically, this
616isn’t necessary. You could create the form using standard HTML.
617However, the benefit of using the helper is that it generates the
618action URL for you, based on the URL in your config file. This makes
619your application more portable in the event your URLs change.</p>
620</li>
621<li><p class="first">At the top of the form you’ll notice the following function call:</p>
622<div class="highlight-ci"><div class="highlight"><pre><span></span><span class="o">&lt;?</span><span class="nx">php</span> <span class="k">echo</span> <span class="nx">validation_errors</span><span class="p">();</span> <span class="cp">?&gt;</span>
623</pre></div>
624</div>
625<p>This function will return any error messages sent back by the
626validator. If there are no messages it returns an empty string.</p>
627</li>
628</ol>
629<p>The controller (Form.php) has one method: <code class="docutils literal"><span class="pre">index()</span></code>. This method
630initializes the validation class and loads the form helper and URL
631helper used by your view files. It also runs the validation routine.
632Based on whether the validation was successful it either presents the
633form or the success page…

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