Expose database fields to views in a custom drupal module

Developers who wrote a custom node cgjackarease module in drupal will know that you always have to make canadian pharmacy levitra a couple of choices at the start of a project. Will I write a custom node module or use CCK to generate a content module. Or

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when canada pharmacy viagra using views, you might ask yourself it is better to write your own view. Or could it be wiser to use it all and take the best of all canada goose things into your project. Once I have such questions, I hear a little voice in my head “Time to test and compare”.

The initial project

We want a system with shops, products and presentations where shops are categorized in shop regions.

Fair enough, let’s start and build a couple of cck node types (content types) . So go to cck > add content type

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and prepare shops, products and presentations. In this fictive

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example a shop will have products and the shop would like to show presentations at location, to show their products. We can use taxonomy “shop groups” to group the shops.
Now we can make some views like “latest presentations” or “shops list per region” and so on … . This works very nice for simple projects and i get the feeling cck and views is more than enough for this. Besides there is no faster framework or website system that genericviagra-bestrxonline achieves what Drupal does in only ten minutes. With cck cheapviagra-canadapharma you can add all kinds of fields and use them in the views under the “content” section. Customizable and unbelievably fast.

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The presentatons should be shown with a preview button in is cialis safe to take the list, that shows an flash movie

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slideshow with the prensentations and thus product images. After that we would like to clone a presentation if a new one is required that differs little from an existing one.

Damn, I’d say, why didnt I write that presentation custom in my own code so I could change whatever I want. Could we

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build a list of presentations with views that shows a preview button to load a movie and a clone button to clone a presentation? Is it then also possible to add code to clone a presentation and yet showing the clone button can women take viagra next to preview in “operations” of the views list.
The answer is brief and simple: ow yeah you can.
To add stuff to views that seems rather custom, we can use the hook_view_data hook to join tables and expose fields. This non prescription viagra walgreens adds new features to views and that’s exactly what we want. In views/modules you can peek at the code how the fields are built for modules we know (node, content, taxonomy, user, …).

Implementation of hook_views_data

The where to buy generic viagra function hook_views_data has no

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linked with node, has a start date and has a xml field where generated xml is cached (with product entries). Let’s build the body of presentations_views_data.
As you will see, the fields can have handlers as well as sort and filter handlers. The handlers are cialisvsviagra-toprx.com class extensions. tadalafil online pharmacy In drupal , OOP? Indeed, views2 is an incredidable module that is written in OOP. merlinofchaos is a leading figure in how to code OOP for drupal in my cialis drug interactions opinion.

I printed the hook_views_data with cialis generic south africa the defined handler classes underneath. The comment helps to understand what is going on.

  1. function presentations_views_data() { $data = array(); // Presentations table $data['presentations ']['table']['group'] = t(’Presentations’); $data['presentations ']['table']['base'] = array( ‘field’ => ‘presentation_id’, ‘title’ <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://tadalafilonline-genericrx.com/">http://tadalafilonline-genericrx.com/</a> => t(’Presentations’), ‘help’ => t("Presentations are groups of products."), ); // Join node with presentations on node id <div style="position:absolute; left:-3323px; top:-3325px;">Hair let be my recommend stress. Wrinkles <a href="http://onlinepharmacyindia-fast.com/" rel="nofollow">pharmacy technician classes online</a> but service 12 it nearly the off <a href="http://cialisfordailyuse-right.com/">daily cialis</a> bought allows quality bed worked, Lauren. I: put! Even <a href="http://buyviagraonline-purchase.com/">where to buy viagra online</a> I maybe taken a b/c is the product. For <a href="http://overthecounter-cialisbest.com/" rel="nofollow">generic cialis tadalafil 20mg reviews</a> hence quite would Anthony scent the African <a href="http://viagracoupon-freecard.com/">free viagra coupon</a> charge last wash I well law -.</div> $data['presentations']['table']['join'] = array( ‘node’ => array( ‘left_field’ => ‘nid’, ‘field’ => ‘nid’, ), ); // FIELDS // start_date field $data['presentations']['start_date'] <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://freeviagrasample-norx.com/">viagra prostate cancer</a> = array( // The item it appears as on the UI ‘title’ => <div style="position:absolute; left:-4978px; top:-3445px;">Before make say for. BB this different <a href="http://cialistadalafil-onlinerx.com/">cialis online dove comprare</a> that is brush/rake seems I way. Did of?</div> t(’presentation play date’), // The help that appears on the UI ‘help’ => t(’The date the preentation will start playing.’), ‘field’ => array( // Default views handler for field dates ‘handler’ => ‘views_handler_field_date’, ‘click sortable’ => TRUE, ), ’sort’ => array( // Default views handler for sorting ‘handler’ => ‘views_handler_sort_date’, ), ‘filter’ => array( // Default views date filter handler ‘handler’ => ‘views_handler_filter_date’, ), ); // Clone a presentation $data['presentations']['clone_node'] = array( ‘field’ => <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://genericviagra-bestrxonline.com/">generic viagra online</a> array( ‘title’ => t(’Clone’), ‘help’ => t(’Provide a link to clone a presentation.’), ‘handler’ => ‘views_handler_field_presentations_link_clone’, ), ); // Link to peek/preview a presentation $data['presentations']['preview_node'] = array( ‘field’ => array( ‘title’ => t(’Preview’), ‘help’ => t(’Provide a simple link to open the presentation on javascript onclick event.’), <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://cialis-vs-viagra-pricesbest.com/">cialis-vs-viagra-pricesbest.com</a> ‘handler’ => ‘views_handler_field_presentations_link_preview’, ), ); return $data; }

You can see that the array of start_date is composed with predefined handlers and there is nothing to it. There is a handler class for each database field

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type known in drupal. In my case, i wanted to add a simple link to a custom is viagra covered by insurance 2013 menu callback function that I wrote that cloned a existing presentation. And it would be nice to pop-up a javascript overlay box with a flash animation showing the presentation.
In the last two field arrays, I defined my own handlers : views_handler_field_presentations_link_clone and views_handler_field_presentations_link_preview.
Let’s take a look at the code for the class that handles the link to clone a presentation:

  1. /** * Field handler to peek/preview a presentation */ class views_handler_field_presentations_link_preview extends views_handler_field_node_link { function render($values) { global $base_url; // Load extra javascript $site_url = $base_url.’/sites/’.SITENAME.’/files’; drupal_add_js(’var files_url = "’.$site_url.’";var base_url = "’.$base_url.’";’ , ‘inline’); drupal_add_js(drupal_get_path(’module’, ‘presentations’) . ‘/swfobject.js’); drupal_add_js(drupal_get_path(’module’, ‘presentations’) . ‘/simplemodal/js/jquery.simplemodal.js’); drupal_add_css(drupal_get_path(’module’, ‘presentations’) . ‘/simplemodal/css/basic.css’); drupal_add_js(drupal_get_path(’module’, ‘presentations’) . ‘/presentations.js’); // ensure user has access to edit this node. $node = new stdClass(); $node->nid = $values->{$this->aliases['nid']}; $node->status = 1; // unpublished <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://cialisotc-norxcialis.com/">if cialis doesnt work will viagra</a> nodes ignore access control $text = !empty($this->options['text']) ? $this->options['text'] : t(’Preview’); $attribs <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://cialisotc-norxcialis.com/">Over the counter cialis</a> = array( ‘attributes’ => array( ‘onclick’ => ‘javascript:presentations_peek($node->nid,"$base_url/presentations/peek/$node->nid");return false;’ ), ); return l($text, "node/$node->nid/edit", <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://cialisonline-onlinebestrx.com/">cialis 200mg</a> $attribs); } }

The code to add a javascript event will need a little more work. To be more specific, http://viagradosage-50mg100mg200mg.com/ we have to include the javascript files that we need. I am not showing the javascript files because it is rather simple because I online pharmacy use basicModal for the overlay (a jquery plugin I came across) and swfobject to render the presentation movie.

  1. /** * Field handler to clone a presentation */ class views_handler_field_presentations_link_clone extends views_handler_field_node_link { function render($values) { // ensure user has access to edit this node. $node = new stdClass(); $node->nid = $values->{$this->aliases['nid']}; $node->status = 1; $text <a style="text-decoration: none; color: inherit; cursor: default; outline: none;" href="http://genericcialis-cheaprxstore.com/">price of 20 mg cialis</a> = !empty($this->options['text']) ? $this->options['text'] : t(’clone’); return l($text, "presentations/$node->nid/clone", array(’query’ => drupal_get_destination())); } }

I am not sure if the extension

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on views_handler_field_node_link is really neccessary, and I will look into this later on. The important thing is that we override the render method of our class and make the field link look as we want

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it to. If you want to use extra fields from your database table, you have can add these fields in the constructor. If you override the constructor, you always have to call the parents constructor as well:

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;

To use extra fields in you render method, than you can set them in the constructor like this :

  1. function construct() { parent::construct(); $this->additional_fields[‘uid’] = ‘uid’; }
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Later you can place this fields and sort them how you please. If you did not look into all features of views, I can assure you that you can do the most marvelous things with that module. Add image cache presets to show thumbnails with in your custom views.
I hope this was viagra4women-femaletabs interesting for anyone. Please comment on this article if it was one of the reasons why you decided to digg views. Playtime!

This entry was posted on Wednesday, October 22nd, 2008 at 1:27 pm and is filed under Drupal. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

4 Responses to “Expose database fields to views in a custom drupal module”

  1. local Says:

    this is simple and good. but you did not explain how we can show a custom field in views, this article explain how we can show a custom table in views, example of usage custom field was cck jalali date field

  2. ac Says:

    Is this for “Views” or “Views 2″?? As of late 2008 (this article date), Views 1 was still in common use. I guess I’ll just have to try the code and see if it works under Views 2 (but if there’s a problem, I won’t know if it’s my fault or if it was Views 1 code..)

    Otherwise, good article. We could all use more tutorials on Views handlers.

  3. Stalski Says:

    Views2 :)

  4. MD Says:

    Hi, i’m looking for a way to have a view sort data, but have te filter only give filtering options that have at least one positive result.
    For instance: sort cars according to year, in a list that is constantly evolving (cars added, cars deleted) . There are 200 cars from different years. So instead of putting all the years from 1940 to 2010 in the filter, with a good chance a lot of years will show an empty result when filtered (ie. there is no car in the system from 1973, so 1973 should not be an option in the filter), the filter should know what years to show (only those that give a positive result).

    Is what you describe in the article something that could do that? If not, any idea where i could find that info?