nl_tokens: Underscores relationship names and appends _id or _ids when serializing relationship keys .
pl_tokens: function ( key , kind ) { key = Ember . String . decamelize ( <mask> ) ; if ( kind === "belongsTo" ) { return key + "_id" ; } else if ( kind === "hasMany" ) { return Ember . String . singularize ( key ) + "_ids" ; } else { return key ; } }