The most important part of creating a new module is defining the module completely. Once you have clearly defined all the fields and the relation of the module with the other modules in the system the implementation is just copy paste and fill in.

This is the process I follow.

Module Name: this name will serve as the start for translation files and also as the internal name of the module. As with any name it should be significant and identify what the module represents but it also must be unique in your coreBOS install. I recommend prefixing a company identifier. The internal name must be a valid PHP identifier. For example

Repository: create a repository to manage your module. For example, https://github.com/tsolucio/cbJustLogIt

Now we have to define the fields, their validations and their layout. I use a template that defines the block name followed by each field definition in the order I want them to appear on the screen. In this layout, I also indicate which field will be the record link identifier and any special functionality I need the fields to have. This looks like this

Note:

• how I mark the justlogitno field as the link field for the module,
• how I group the fields two by two to indicate each row
• how I add a comment on how and where to fill in the two displaytype 2 fields
• how I accommodate space for the default fields
• how I specify the modules supported by the uitype 10 capture field
• ALL field and column names MUST be in lower case

Next up are the list view fields. We have to choose from the fields above which ones will appear on the "All" filter, which ones appear in the popup when we try to select a record from this module and also which fields appear on any related list this module may be related to. I simply indicate them like this

Now we must define the relations this module has with other modules in the system. These will be indicated by the uitype 10 fields above and any many to many relations the module may have

Next, we must define the initial sharing privileges and the distribution license of the module.

Finally, we must specify any additional functionality. This is where we will explain cron jobs, event handlers and any special widgets or operations the module will have.

Reached this point we have a clear idea of everything we need to create our module and we can start coding.

You can download a text template here

The steps are

1.- copy the vtlib/ModuleDir directory to the "modules" directory renaming it to the internal name of your module

cp -a vtlib/ModuleDir modules/cbJustLogIt

2.- rename the three ModuleFile files to the name of your module

cd modules/cbJustLogIt
rename 's/ModuleFile/cbJustLogIt/g' ModuleFile*

3.- edit manifest.xml and fill in the definitions you created

3.1.- Change the name and label

3.2.- Change the parent which is the name of the menu you want the module to be in

3.3.- Change the description and the license

3.4.- Add the SQL to create the main table.

3.4.1.- This table must be the name of your module in lowercase prefixed with "vtiger_".

3.4.2.- It must contain the internal primary key which is the name of your module in lowercase followed by "id"

3.4.3.- Add a field for all the fields in your module except the common _crmentity fields

3.4.4.- Add any index your users may need. In other words, stop to think about how your module is going to be used, on which fields will your user be searching and sorting. Add a database index on those fields.

3.5.- Change the name of the custom field table

3.6.- Now for each block and field fill in the fields XML accordingly. There are a lot of existing manifest.xml files in the application for you to study.

3.7.- Fill in the All filter fields

3.8.- Fill in the sharing access, default actions, related lists, and other special settings

4.- Each module has a main file that defines its class. This file was copied in step 1 and renamed in step 2. So we now have a file called:

modules/cbJustLogIt/cbJustLogIt.php

edit this main module file and change

4.1.- the module class name

4.2.- replace MODULE_NAME_LOWERCASE with the lowercase internal name of your module

4.3.- replace MODULE_REFERENCE_FIELD with the name of your modules' reference field

4.4.- now fix the related list and popup fields array

4.5.- set the module record autoincrement prefix

$this->setModuleSeqNumber('configure', $modulename, $modulename.'-', '0000001');

5.- Translate

5.1.- Get the set of labels used and copy them to the en_us.lang.php file

grep -i label manifest.xml

Once he en_us.lang.php is translated copy it to any other language file and translate accordingly.

Finally create any additional logic that is needed: save module, eventhandlers, cron,...

Now you are ready to install and test. Use the build/HelperScripts/installmodule.php script.

Before installing I like to make a dump of the database so I can easily recover if I made a mistake and try again. Normally the errors appear in the manifest field definitions, typical copy-paste errors.

In order to be able to send this module to any coreBOS, you have to set up a specific structure.

The structure looks like this:

manifest.xml
modules/
  ModuleName/
   <Module Related Files>
   language/
    en_us.lang.php
    <Other language Files>
templates/
  <Smarty templates of the Module>

The manifest in the top level is a copy of the one inside the modules directory.

You can now compress this structure into a .zip and send it to any coreBOS in the world.

A very good reference for creating modules can be found here. This is a VERY interesting read as it will give you knowledge on how to create a module using the vtlib API which will be useful for you to be able to change modules once installed.