Can not find data record in database table external_functions

by Charan Sri.  

Hello All,

I am trying to write a custom web service in Moodle. I took local_wstemplates_hello_world as an example and trying to implement a webservice for my custom plugin.

I have added three methods as below in externallib.php file:

1) function coupons_parameters()

2) function coupons()

3) function coupons_returns()

In Services.php file. I have added code as below:

$services = array(

        'My service' => array(

                'functions' => array ('local_wstemplate_hello_world', 'local_wstemplate_coupons'),

                'restrictedusers' => 0,

                'enabled'=>1,

        )

);

$functions = array(

        'local_wstemplate_hello_world' => array(

                'classname'   => 'local_wstemplate_external',

                'methodname'  => 'hello_world',

                'classpath'   => 'local/wstemplate/externallib.php',

                'description' => 'Return Hello World FIRSTNAME. Can change the text (Hello World) sending a new text as parameter',

                'type'        => 'read',

        ),

'local_wstemplate_coupons' => array(

        'classname'   => 'local_wstemplate_external',

        'methodname'  => 'coupons',

        'classpath'   => 'local/wstemplate/externallib.php',

        'description' => 'Return coupons details',

        'type'        => 'read'

    )

);

Now, When I want to call the method 'coupons()' from a webservice using wsfunction = local_wstemplate_coupons.

It is showing error as follows:

stdClass Object
(
    [exception] => dml_missing_record_exception
    [errorcode] => invalidrecord
    [message] => Can not find data record in database table external_functions.
    [debuginfo] => SELECT * FROM {external_functions} WHERE name = ?
[array (
  0 => 'local_wstemplate_coupons',
)]
)

Please help me on how to fix this issue?

Thanks in Advance

Regards

Sricharan