Posts Tagged ‘doctrine2’

Uganda Web Developer Workshops: Rotary Style – Idea looking for Partners and Direction

This is an idea that has been growing in my mind, and I seem to finally have a handle on it. I have been a professional PHP web developer for the last 12 years, and have gone through the learning and transition cycles from learning a new language from Visual Basic 6 and MS Access to Java/JSP/Servlets to PHP, and developing in the language from direct database access using mysql_query through a custom developed database class into Zend Framework for 2 years with Doctrine 1 and 2 ORMs.

My biggest challenge has to do with the fact that there are no places to go and talk code, PHP/Javascript/Database in Uganda, along with the experiences and challenges facing web development with “need-to-have” practices like:

  1. Refactoring
  2. MVC design for web applications
  3. Version control – branching, merging, version tagging and management
  4. Testing – unit and functional testing, load testing
  5. API development (okay this is pushing the enveloper)
  6. Continuous integration, code quality metrics – complexity, modular development, cyclomatic complexity
  7. Team Style development – PSR 0 and PSR 1 compatibility
  8. Frameworks – Symfony, Zend Framework, Kohana, JQuery, Twitter Bootstrap
  9. Advanced CSS and HTML 5 – style guides, browser targetting, mobile development

I am also looking at doing this Rotary style, 1 hour developer meetings once in 2 weeks, then later once a week, same night, same location.

The bottom line is that we develop the quality of the available pool of web developers by growing a community, having role models, to also put a brighter face on the industry, improve perceptions and make it clear that this is an area that has professional practices. It is a win-win for all involved

Any ideas who has done this before, what were your challenges and trials, who would like to partner on this?

Doctrine2 Day 3 – Proxies, Associations, Relationships

Well if you are following this series, then by know you are aware that we have the validators setup, and we are almost ready to go. Well not quite so. I ran into an issue with proxies and class loaders which took a while to resolve, but what I did was:

a) Changed the Zend Framework-Doctrine2 integration to the Bisna integration (https://github.com/guilhermeblanco/ZendFramework1-Doctrine2) – note the additional configurations before

b) Learnt that DO NOT SAVE ANY MODELS IN SESSION OR CACHES due to Proxy auto loading issues

c) Develop unit tests for the model validations and saving as you go along because they will save you as you shift things around . I am currently trying to save an association to the database but due to the tests that I have running I can test out the different association mappings without issues because I track the changes using my unit tests.

Now onto relationships, well what I found was a follows:

  1. I have been having a tough time dealing with relationships from Doctrine 1 which autoloaded relationships, however with with the Doctrine2 data mapper, you have to auto load the associations your self
  2. In Doctrine 2, you cannot define the foreign key column and relationship as this creates problems for the ORM mapper, so since I need to access the foreign key value for example personid, and the related object person, my approach has been as follows:
    • Added a person instance and relationship mapping to the person as per the Doctrine
    • Add a setter setPersonID() which loads the Person from the database using the provided ID and sets it to the person relationship provided
    • Added a getter getPersonID() which obtains the id of the person for use on the screen
  3. As recommended avoid bi-directional relationships where possible, try to keep them as uni-directional as possible.

Next I will be implementing a nested hierarchical structure using the tree nested set implementation at http://www.gediminasm.org/

Doctrine 2 – Day 2 – Model Validation using Symfony Validator Service in Zend Framework

It is just Day 2 of my experiences in the trenches, regular work, had kept me from this but I managed to get some time to keep digging. As a followup to my Doctrine 2 – Day 1 – Commentary from the Trenches. The models are up and configured, and the unit testing is setup following steps from Michelangelo van Dam’s presentation (http://www.slideshare.net/DragonBe/unit-testing-zend-framework-apps).

One of the major process that we are implementing with this migration is detailed unit testing which was tougher with the Doctrine1. With the unit test infrastructure setup, the next item on the agenda is model validation. From previous experience (before Doctrine 1) and with Doctrine1 it is critical to be able to specify validation rules using annotations without having to write PHP if statements. Being a ZF person, the first step to look was the ZF validator classes. While they seem to be well integrated with the forms, they would prove to be too verbose to use for validation of models, since I also need to be able to specify multiple validators per column, and this would not cut it for me.

Next stop was Symfony2 validator service (http://symfony.com/doc/current/book/validation.html) provides validators with annotations support. So that was the easy part, the hard part was yet to come integration. The integration followed the steps below:

a) Add Symfony Validator service to library folder, easy, just download a package from https://github.com/symfony/Validator

b) Register the Symfony Validator annotations – this is where I had problems (more later)

c) Add the Symfony Validators to the model properties

d) Add validation code which needed a validate() method in the base class from which all entities are derived, which requires @ORM\HasLifecycleCallbacks (so that the model can hook into the lifecyle call back models) @ORMPrePersist and @ORM\PreUpdate for the validate method to ensure its called before the models are saved (first time) or updated. More details on the Doctrine annotations can be found at http://docs.doctrine-project.org/projects/doctrine-orm/en/latest/reference/annotations-reference.html

So what problems did I face.

1. From the Doctrine documentation, you use the annotations directly, for example @Id, however experience has shown that you need to namespace and alias them see note from Symfony integration http://symfony.com/doc/current/book/doctrine.html . So I had to change all the Doctrine annotations to use @ORM namespace

2. The default annotation driver only supports a single namespace so you will need to update as per the pastebin below

http://pastebin.com/embed_iframe.php?i=feiKsVxg

Now I am a happy camper, got my models working using Symfony validations, we only have to write code for custom validations which happens only about 20 – 30% of the time.

As a parting shot, the Symfony team and community have done a great job for PHP, why because they provide standalone components (similar to Zend Framework), but each of their components can be used without the rest of the framework. As I was investigating the validator usage and issues, I found a thread where Fabien Potencier and team were discussing annotation support in Symfony. However they also noted that Doctrine Commons had better support, so they stopped the work on Symfony annotation support and just used the services of the Doctrine team. This is how all software development should be done, and is a torch to the rest of us. I am a convert, and happy to be a proud member of the PHP community.

Update May 8, 2012

I had promised to provide some sample snippets of what I am using for the integration with Bisna integration and Symfony validation that I ended up using so here we go https://gist.github.com/2638526 The files are as follows:

a) application.ini – there is nothing special here from Bisna. Includes the cache configuration, prod/staging/dev/test environments all of which inherit from production

b) index.php – from the public folder or htdocs – this may not be perfect but it works and am looking for ways to simplify it

c) Bootstrap – this is the file we use, highlight:

– Storing the entity manager instance in the Zend_Registry, we have a utility method which loads it from the registry and another which also provides a connection from the entity manager so its fully encapsulated

– intialization of the Zend_DB adapter, we need this since we are using the Zend_Session to save the sessions in the database

– the last config is for other resources we use. We have a dependency on the Zend_Registry class as it hides a lot of complexity

d) Document.php – a sample model class

– it extends BaseEntity which provides automatic getters and setters through the __call method, some required fields like id, datecreated, last  update date and last updated by (not all models extend this class only those which need those auditing fields)

– Why do we have getCategoryID(), setCategoryID() for the category property instead of mapping the categoryid field from the database see the next post in the series https://ssmusoke.wordpress.com/2012/03/25/doctrine2-day-3-proxies-associations-relationships/

– Unlike the Doctrine2 defaults we do not use tablename_id but rather tablenameid for the foreign keys so we have define them in each relationship.

Please let me know what I can do to make this any clearer, thanks for reading

State of PHP Feb 2012 – Symfony 2, Zend Framework 2, IDE Support, MySQL

There is just too much going on so I thought I should put these thoughts down so that I do not lose my mind from the excitement and anticipation that comes from things moving very fast and innovation being spured at a pace which is mind boggling.

PHP

In my opinion the stabilization of PHP 5.3 which introduced namespaces (similar to Java Packages) was the first shot across the bow, and I expect 5.4 with traits to bring even more reusability. However our hosting providers are slow to upgrade most are still running PHP 5.2, without general availability for 5.3 just starting to appear

Frameworks

There are two main frameworks in the bull pen Symfony 2 (http://symfony.com/) and Zend Framework 2 (http://zendframework.com/) currently in beta. However they are as different as can be. While Symfony 2 has been refactored from a full blown framework to a bunch of core reusable components, its moving towards ZF2, in that its not trying to be all MVC, forms etc, but is rather a set of building blocks to provide web application framework. So good is it that Fabien Potencier the lead developer has a series on how to build your own framework on top of Symfony at http://bit.ly/zVLi7X

ZF2 on the other hand is a bunch of reusable components which you can mix and match with other frameworks which also provides an MVC, ORM etc.

If you have been in the Java world, Symfony is more like Spring Source () while Zend Framework is Apache Jakarta (http://jakarta.apache.org/)

Interesting tweet that sums it all up:
Every time a developer complains about php, the #Symfony2 community creates another great, namespaced, decoupled and reusable component

IDE Support

Zend Studio 9 was let loose at ZendCon, Oracle released Netbeans 7 (which supports ZF1, and Symfony), Eclipse PDT is chugging along, PHP Storm from Jetbrains creating  a storm with others  Vim, Notepad++, Sublime Text basically all you need to do is pick your poison.

Communities

Github (http://www.github.com) is the new Facebook and LinkedIn for developers, where all the action is happening for all the major PHP communities, you had better be there. Forking and making changes is as easy as a button press. I am yet to push my first commit to a project but I am getting there.

MySQL

The best know web database is getting losta love from Oracle, and also the community led by Percona, SkySQL, Monty DB, and many others. Where it seemed lost with lost of FUD during the $1bn Sun takeover by Oracle, it seems to just be gaining steam (at least from my viewpoint as a consumer, developer and user). Now at 5.5, with 5.6 starting to appear over the horizon …

While there is a barrage of NoSQL solutions, Hadoop leading the charge, MySQL provides a NoSQL interface via HandlerSocket (https://github.com/ahiguti/HandlerSocket-Plugin-for-MySQL) and MySQL Cluster (http://www.mysql.com/products/cluster/)

Supporting Infrastructure

This is where all the fun happens, who is using the language and what are the trends. Here is a snapshot:

  1. Content Management Systems – WordPress is getting lots of love, while Joomla now at 2.5 supports databases other than MySQL. Drupal is adopting Symfony 2 as its core framework while Magento runs off a modified ZF1 kernel, while XOOPS (http://xoops.org) is being rewritten to use ZF1 or two
  2. Template Engines – an area where battles are found won, and lost. Smarty now at 3.0 (www.smarty.net), has to battle Twig (http://twig.sensiolabs.org)  which is surging due to its usage in Symfony 2
  3. Web services – JSON, XML, AjaX, Rest Interfaces are no longer buzz words they are the norm with native support being baked into PHP
  4. Object Relational Mappers (ORMS) are one of the core developer architectural choices, in PHP we have ZF Table (Table Gateway), Doctrine 1 (Active Record), Doctrine 2 (Data Mapper), Propel (not used) in addition to plain old PDO all of which provide rich choices. Interesting is that Doctrine 2 provides an mapping for MongoDB which shows its versatility similar to Hibernate for Java
  5. Continuous Integration – with Hudson and Jenkins, and now Travis which is also hooked into Github provides a great way to continuously monitor the quality of your development
  6. Quality Control – PHP Unit has always been there but now we have mess detectors, and other metrics (do not make sense of them yet), but whatever you want to measure there is probably a tool for it.
  7. UI Toolkits – JQuery took the world by storm with JQuery UI providing a set of theme-able components, but we have HTML5 boiler plate and Twitter Bootstrap which are simplifying the cross browser issues we developers face.
  8. Performance – always a PHP problem but it has improved through 5.3 to 5.4, and other techniques like OP Caches are becoming more maintream, Memcache is pre-built into Apache …

Exciting times to be a PHP web developer oopsss we are not web developers we are Software Mechanics (http://www.brandonsavage.net/the-mechanics-of-code/)

Year End New Challenge – Symfony 2

Well a new month December the last one of the year, and I am tackling a new challenge Symfony 2 (http://www.symfony-project.org/) For client projects we are using Zend Framework 1.11 + Doctrine 1.2 + JQuery which all run on PHP 5.2

I think the coming holidays give me a chance to jump into PHP 5.3+ along with Symfony 2 + Doctrine 2 + the latest PHP unit and dabble into Continuous Integration either Jenkins or Travis.

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