"Could not install module" error in PyroCMS - php

Question

I have been building a module in PyroCMS and have made its structure. I am using Streams API to build forms and perform my actions and also performed a dummy install to check if everything looks ok. Then I went on modifying the contents of the dummy and completing my structure. However, in the details.php file, I made a change where I created a foreign key (relationship type of field, if u know the API jargon) to retrieve a field from another stream(the other stream being defined after my current stream) and now when I install the module, it shows 'Could not install the module' error, but I can see the module has been installed. I have tried to comment out the foreign key reference, but the problem still persists.
Here's my details.php file:
class Module_Employer extends Module
{
public $version = '1.0';
public function info()
{
return array(
'name' => array(
'en' => 'Employer'
),
'description' => array(
'en' => 'Module for Employer'
),
'frontend' => true,
'backend' => true,
'menu' => 'content',
'shortcuts' => array(
'create' => array(
'name' => 'Employer:new',
'uri' => 'admin/employer/create',
'class' => 'add'
)
)
);
}
public function install()
{
// We're using the streams API to
// do data setup.
$this->load->driver('Streams');
$this->load->language('employer/emp');
// Add streams
if ( ! $this->streams->streams->add_stream(lang('Employer:employers'), 'employers', 'employer', null, 'This is the Employer Stream')) return false;
if ( ! $this->streams->streams->add_stream(lang('Employer:company'), 'company', 'company', null, 'This is the Company Stream')) return false;
if ( ! $this->streams->streams->add_stream(lang('Employer:job'), 'jobs', 'job', null, 'This is the Job Stream')) return false;
// Fields for employers table
$employer_fields = array(
array(
'name' => 'Name',
'slug' => 'name',
'namespace' => 'employer',
'type' => 'text',
'extra' => array('max_length' => 100),
'assign' => 'employers',
'title_column' => true,
'required' => true,
'unique' => true
),
array(
'name' => 'Username',
'slug' => 'username',
'namespace' => 'employer',
'type' => 'text',
'extra' => array('max_length' => 100),
'assign' => 'employers',
'title_column' => true,
'required' => true,
'unique' => true
),
array(
'name' => 'Password',
'slug' => 'password',
'namespace' => 'employer',
'type' => 'encrypt',
'extra' => array('hide_typing' => 'yes'),
'assign' => 'employers',
'title_column' => true,
'required' => true,
'unique' => true
),
array(
'name' => 'Credits',
'slug' => 'credits',
'namespace' => 'employer',
'type' => 'integer',
'extra' => array('max_length' => 10),
'assign' => 'employers',
'title_column' => true,
'required' => true,
'unique' => true
),
array(
'name' => 'Company name',
'slug' => 'company_name',
'namespace' => 'employer',
'type' => 'relationship',
'extra' => array('choose_stream' => 'company'),
'assign' => 'employers',
'title_column' => true,
'required' => false,
'unique' => false
)
);
$this->streams->fields->add_fields($employer_fields);
//Fields for company stream
$company_fields = array(
array(
'name' => 'Username',
'slug' => 'username',
'namespace' => 'company',
'type' => 'relationship',
'extra' => array('choose_stream' => 'employers'),
'assign' => 'company',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'E-mail',
'slug' => 'email',
'namespace' => 'company',
'type' => 'email',
'assign' => 'company',
'title_column' => true,
'required' => true,
'unique' => false
),
array(
'name' => 'Company Name',
'slug' => 'company_name',
'namespace' => 'company',
'type' => 'text',
'extra' => array('max_length' => 100),
'assign' => 'company',
'title_column' => true,
'required' => true,
'unique' => true
),
array(
'name' => 'Logo',
'slug' => 'logo',
'namespace' => 'company',
'type' => 'image',
'extra' => array('folder' => 'upload'),
'assign' => 'company',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Designation',
'slug' => 'designation',
'namespace' => 'company',
'type' => 'text',
'extra' => array('max_length' => 100),
'assign' => 'company',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Contact No.1',
'slug' => 'contact1',
'namespace' => 'company',
'type' => 'integer',
'extra' => array('max_length' => 10),
'assign' => 'company',
'title_column' => true,
'required' => true,
'unique' => false
),
array(
'name' => 'Contact No.2',
'slug' => 'contact2',
'namespace' => 'company',
'type' => 'integer',
'extra' => array('max_length' => 10),
'assign' => 'company',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Contact No.3',
'slug' => 'contact3',
'namespace' => 'company',
'type' => 'integer',
'extra' => array('max_length' => 10),
'assign' => 'company',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Address',
'slug' => 'address',
'namespace' => 'company',
'type' => 'textarea',
'assign' => 'company',
'title_column' => true,
'required' => true,
'unique' => false
),
array(
'name' => 'Billing ddress',
'slug' => 'billing_address',
'namespace' => 'company',
'type' => 'textarea',
'assign' => 'company',
'title_column' => true,
'required' => true,
'unique' => false
),
);
$this->streams->fields->add_fields($company_fields);
//Fields for company stream
$job_desc_fields = array(
array(
'name' => 'Username',
'slug' => 'username',
'namespace' => 'company',
'type' => 'relationship',
'extra' => array('choose_stream' => 'employers'),
'assign' => 'jobs',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Key Skills',
'slug' => 'keyskills',
'namespace' => 'company',
'type' => 'textarea',
'assign' => 'jobs',
'title_column' => true,
'required' => true,
'unique' => false
),
array(
'name' => 'Position Summary',
'slug' => 'position_summary',
'namespace' => 'company',
'type' => 'textarea',
'assign' => 'jobs',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Experience',
'slug' => 'experience',
'namespace' => 'company',
'type' => 'text',
'assign' => 'jobs',
'title_column' => true,
'required' => true,
'unique' => false
),
array(
'name' => 'Industry',
'slug' => 'industry',
'namespace' => 'company',
'type' => 'text',
'assign' => 'jobs',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Functional Area',
'slug' => 'functional_area',
'namespace' => 'company',
'type' => 'text',
'assign' => 'jobs',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Salary',
'slug' => 'salary',
'namespace' => 'company',
'type' => 'text',
'assign' => 'jobs',
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Start Date',
'slug' => 'start_date',
'namespace' => 'company',
'type' => 'datetime',
'assign' => 'jobs',
'extra' => array('input_type' => 'datepicker'),
'title_column' => true,
'required' => false,
'unique' => false
),
array(
'name' => 'Job Type',
'slug' => 'job_type',
'namespace' => 'company',
'type' => 'choice',
'assign' => 'jobs',
'extra' => array('input_type' => 'datepicker'),
'title_column' => true,
'required' => false,
'unique' => false
),
);
return true;
}
public function uninstall()
{
$this->load->driver('Streams');
$this->streams->utilities->remove_namespace('employer');
return true;
}
public function upgrade($old_version)
{
// Your Upgrade Logic
return true;
}
public function help()
{
// Return a string containing help info
// You could include a file and return it here.
return "No documentation has been added for this module.<br />Contact the module developer for assistance.";
}
}

Answer 1

I had earlier "installed" the module, but under the uninstall() function, I forgot to add the code for removing all the streams(P.S: I had 3 streams with separate namespaces defined in the install() function). I only had the following:
$this->streams->utilities->remove_namespace('employer');
Due to this, the other streams were 'existing' in the system although on the face of it, the module was uninstalled, and whenever I tried to reinstall the module, I got the error Could not install module, since while creating tables/streams in the database, the query returned FALSE as the tables already existed.
However, I then added the code to remove all the other streams, by simply including their namespaces in the call for example:
$this->streams->utilities->remove_namespace('employer');
$this->streams->utilities->remove_namespace('job');
$this->streams->utilities->remove_namespace('company');
..and the problem was fixed!