How can I embed repeated data into single JSON object - mysql

Question

How can I embed below data in JSON format in such way that, I can get only one JSON object for each hall.
As you can see I have data from two tables one is from "hall_information" that is not repeated in table because hall_name ,service_provider_id & id will be entered once by user.
But in second table that "hall_price" in which i have slot_name, slot_ending_time, slot_starting_time, hall_type, which are repeated as user can describe his price for hall for morning, evening and full day, and for hall_type mini, mantap and bunquet. so these rows can repeat 9 times for each hall with 3 hall_types and for each hall_type 3 pricing.
So i want to combine into only one row as a query result in json format. I am using php with Codeigniter & angular.js for my project. how to embed this result of query into single json object. so that while looping using ng-repeat i can get only one hall NOT 9 halls with same name. Thanks in advance.
var hallinfo =
[
{
"hall_name":"Sai mantap","id":"12","service_provider_id":"35",
"slot_name":"morning","slot_charge":"5000","slot_starting_time":"09:00:00","slot_ending_time":"03:00:00",
"hall_info_id":"45","hall_type":"mantap"
},
{
"hall_name":"Sai mantap","id":"12","service_provider_id":"35",
"slot_name":"evening", "slot_charge":"10000","slot_starting_time":"05:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"45","hall_type":"mini"
},
{
"hall_name":"Sai mantap","id":"12","service_provider_id":"35",
"slot_name":"full_day","slot_charge":"15000","slot_starting_time":"09:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"45","hall_type":"bunquet"
},
{
"hall_name":"Raman mantap ","id":"13","service_provider_id":"36",
"slot_name":"morning","slot_charge":"5000","slot_starting_time":"09:00:00","slot_ending_time":"03:00:00",
"hall_info_id":"46","hall_type":"mantap"
},
{
"hall_name":"Raman mantap","id":"13","service_provider_id":"36",
"slot_name":"evening", "slot_charge":"10000","slot_starting_time":"05:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"46","hall_type":"mini"
},
{
"hall_name":"Raman mantap","id":"13","service_provider_id":"36",
"slot_name":"full_day","slot_charge":"25000","slot_starting_time":"09:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"46","hall_type":"bunquet"
},
];
here are the table schemas.
CREATE TABLE hall_information (
id integer NOT NULL,
hall_name character varying(30),
service_provider_id REFERENCES service_provider(id);
);
CREATE TABLE hall_pricing (
id integer NOT NULL,
slot_name slot_type NOT NULL,
slot_charge integer NOT NULL,
slot_starting_time time without time zone NOT NULL,
slot_ending_time time without time zone NOT NULL,
hall_info_id integer REFERENCES hall_information(id),
hall_type character varying(20)
);
and my query to fetch all records is
public function get_hall_info(){
$this->db->select('*');
$this->db->from('hall_info');
$this->db->join('hall_pricing', 'hall_info.id = hall_pricing.hall_info_id');
$query =$this->db->get();
return $query->result();
}
I guess this will do my work but i dont have idea to convert my data into this below form.
var hallinfo =
[
{
"hall_name":"Sai mantap","id":"12","service_provider_id":"35",
"slots":[
{
"slot_name":"morning","slot_charge":"5000","slot_starting_time":"09:00:00","slot_ending_time":"03:00:00",
"hall_info_id":"45","hall_type":"mantap"
},
{
"slot_name":"evening", "slot_charge":"10000","slot_starting_time":"05:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"45","hall_type":"mini"
},
{
"slot_name":"full_day","slot_charge":"15000","slot_starting_time":"09:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"45","hall_type":"bunquet"
}
]
},
{
"hall_name":"Raman mantap ","id":"13","service_provider_id":"36",
"slots":[
{
"slot_name":"morning","slot_charge":"5000","slot_starting_time":"09:00:00","slot_ending_time":"03:00:00",
"hall_info_id":"46","hall_type":"mantap"
},
{
"slot_name":"evening", "slot_charge":"10000","slot_starting_time":"05:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"46","hall_type":"mini"
},
{
"slot_name":"full_day","slot_charge":"25000","slot_starting_time":"09:00:00","slot_ending_time":"10:00:00",
"hall_info_id":"46","hall_type":"bunquet"
}
]
}
];