Moving association func on the outside of through

We've ran into an issue where Chrome 32 thinks that the nested **association** function in the **through** function is undefined. 

"TypeError: Cannot call method 'call' of undefined
    at through (http://localhost:3000/web/assets/backbone_extensions/associations.js?body=1:22:49)
    at associations.belongsTo (http://localhost:3000/web/assets/backbone_extensions/associations.js?body=1:48:82)