cakephp 2.X override table prefix dynamically on join action - sql

Question

I a cakephp setup to manage multiple web-sites in which they a number of common models, with the table prefix 'main_'. And there's common model Fbuser is using a table 'main_fb_users'
And now, I have a web-site, and its table prefix is 'myweb_', and I have a model, Mymodel, which have to be left-join with Fbuser.
$this->Mymodel->find('all', array(
'joins' => array(
'table' => 'main_fb_users',
'alias' => 'Fbuser',
'type' => 'LEFT',
'conditions' => array('Mymodel.field01 = Fbuser.field02')
));
and here's the error message I have got
SQLSTATE[42S02]: Base table or view not found: 1146 Table 'dbserver.myweb_main_fb_users' doesn't exist
obviously, it's due to the different in the table prefix, and I can't change the default table prefix set in the database.php.
so how can I override the table prefix inside the join query?

Answer 1

Pass the model object instead of the table name as a string:
$this->Mymodel->find('all', array(
'joins' => array(
'table' => $this->Mymodel->FbUser,
'alias' => 'Fbuser',
'type' => 'LEFT',
'conditions' => array('Mymodel.field01 = Fbuser.field02')
));
Seems to work for me.

Answer 2

Hacked Method (for version 2.x)
Go to - /lib/Cake/Model/Datasource/DboSource.php line #942
Modify the function fullTableName as below:
public function fullTableName($model, $quote = true, $schema = true, $prefix = true) {
if (is_object($model)) {
$schemaName = $model->schemaName;
$table = $model->tablePrefix . $model->table;
} elseif (!empty($this->config['prefix']) && strpos($model, $this->config['prefix']) !== 0) {
$table = (((!empty($prefix) && $prefix !== true)?$prefix:(($prefix === false)?'':$this->config['prefix'] ))). strval($model);
} else {
$table = strval($model);
}
if ($schema && !isset($schemaName)) {
$schemaName = $this->getSchemaName();
}
if ($quote) {
if ($schema && !empty($schemaName)) {
if (strstr($table, '.') === false) {
return $this->name($schemaName) . '.' . $this->name($table);
}
}
return $this->name($table);
}
if ($schema && !empty($schemaName)) {
if (strstr($table, '.') === false) {
return $schemaName . '.' . $table;
}
}
return $table;
}
Now go to line #1881 on same page and modify the function buildJoinStatement as:
public function buildJoinStatement($join) {
$data = array_merge(array(
'type' => null,
'alias' => null,
'table' => 'join_table',
'conditions' => '',
), $join);
if (!empty($data['alias'])) {
$data['alias'] = $this->alias . $this->name($data['alias']);
}
if (!empty($data['conditions'])) {
$data['conditions'] = trim($this->conditions($data['conditions'], true, false));
}
if (!empty($data['table']) && (!is_string($data['table']) || strpos($data['table'], '(') !== 0)) {
$data['table'] = (isset($data['prefix']))?$this->fullTableName($data['table'],true,true,$data['prefix']):$this->fullTableName($data['table']);
}
return $this->renderJoinStatement($data);
}
thats it...
now if you provide a prefix element in joins array then it will use the same prefix for that table.
Example
'joins'=>array(
array(
'table'=>'GDN_Comment',
'type'=>'LEFT',
'prefix'=>false,
'alias'=>'Comment',
'conditions'=>array('MyPost.DiscussionID = 2'),
),
),
Then it will use "GDN_Comment as Comment" in sql query
OR
'joins'=>array(
array(
'table'=>'GDN_Comment',
'type'=>'LEFT',
'prefix'=>'ds_',
'alias'=>'Comment',
'conditions'=>array('MyPost.DiscussionID = 2'),
),
),
Then it will use "ds_GDN_Comment as Comment" in sql query

Answer 3

You can adjust the table prefix on the fly in the controller:
$this->loadModel('MainFbUser');
$this->MainFbUser->tablePrefix = '';
In the documentation:
http://book.cakephp.org/2.0/en/models/model-attributes.html#tableprefix