Common transformResponse in factory $resource - angularjs

Question

We are using a factory to interact with a series of custom APIs around common entities. However, part of what I need to do is evaluate the custom responses sent back in the headers and it seems like they way to do this is to use transformResponse. What I have seems to be working, but I'm literally repeating the same thing over and over in each definition. I tried creating a function to make it reusable, but the reference seems to fail. What am I doing wrong?
(function()
{
'use strict';
angular.module('aumBills', ['ngResource'])
.factory('Bills', ['$resource',
function($resource)
{
return $resource(
'/ua_aumcore/bills/api/v1/bills/:billableEventI',
{
billableEventI:'#billableEventI'
},
{
getList:
{
method: 'GET',
isArray: false,
transformResponse: function(data, header, status, config, statusText)
{
var response = {};
if (isJson(data))
{
data = angular.fromJson(data);
response.data = data;
}
response.status = status;
response.config = config;
response.statusText = statusText;
return response;
},
url: '/ua_aumcore/bills/api/v1/bills/query/'
},
getParties:
{
method: 'GET',
isArray: false,
transformResponse: function(data, header, status, config, statusText)
{
var response = {};
if (isJson(data))
{
data = angular.fromJson(data);
response.data = data;
}
response.status = status;
response.config = config;
response.statusText = statusText;
return response;
},
url: '/ua_aumcore/bills/api/v1/customer/billParties/?partySites=:partySiteIDs',
params: {partySiteIDs: '#partySiteIDs'}
}
//plus about 12 more after this
});
}]);
function isJson(str)
{
try
{
JSON.parse(str);
}
catch (e)
{
return false;
}
return true;
}
})();
The code that broke looked identical to above, only I put:
transformResponse: transResp(data, header, status, config, statusText),
in each definition, and then this is the function that follows immediately after isJSON:
function transResp(data, header, status, config, statusText)
{
var response = {};
if (isJson(data))
{
data = angular.fromJson(data);
response.data = data;
}
response.status = status;
response.config = config;
response.statusText = statusText;
return response;
}

Answer 1

It looks like defining the transformResponse function I want to use as a variable, and plugging the variable into the definition works:
(function()
{
'use strict';
angular.module('aumBills', ['ngResource'])
.factory('Bills', ['$resource',
function($resource)
{
var transResp = function(data, header, status, config, statusText)
{
var response = {};
if (isJson(data))
{
data = angular.fromJson(data);
response.data = data;
}
response.status = status;
response.config = config;
response.statusText = statusText;
return response;
};
return $resource(
'/ua_aumcore/bills/api/v1/bills/:billableEventI',
{
billableEventI:'#billableEventI'
},
{
get:
{
method: 'GET',
isArray: false,
transformResponse: transResp,
url: '/ua_aumcore/bills/api/v1/bills/:billableEventI'
},
getList:
{
method: 'GET',
isArray: false,
transformResponse: transResp,
url: '/ua_aumcore/bills/api/v1/bills/query/'
}
//and so on and so forth
});
}]);
function isJson(str)
{
try
{
JSON.parse(str);
}
catch (e)
{
return false;
}
return true;
}
})();