package.json

{
  "name": "sequlize_user_model",
  "version": "0.1.0",
  "main": "sequlize_user_model.js"
}

sequlize_user_model.js

// Return express middleware that exposes sequelize query equivalents in req.context with user injected in
// object instances
//
// e.g. req.context.findById(User, 1) => {dataValues: {id: 1}, context}
//
// requires req.user to be available
module.exports = function(app, options){
    app.use(function(req, res, next){
        if(!req.context){
            req.context = {};
        }
        var arrays = ["findAll"];
        var singles = ["findById", "findOne", "findOrInitialize", "findOrCreate", "create"];
        var singleNoPromise = ["build"];

        // Make req.context.findAll and inject user to results
        arrays.forEach(function(name){
            req.context[name] = function(){
                var model = arguments[0];
                // Strip model from arguments
                Array.prototype.shift.apply(arguments);
                // Apply original function
                return model[name].apply(model, arguments).then(function(results){
                    results.forEach(function(result){
                        if(result){
                            result.context = {
                                user: req.user
                            }
                        }
                    })
                    return results;
                });
            };
        });
        // Make req.context.findById, findOne, ... and inject user to result
        singles.forEach(function(name){
            req.context[name] = function(){
                var model = arguments[0];
                // Strip model from arguments
                Array.prototype.shift.apply(arguments);
                // Apply original function
                return model[name].apply(model, arguments).then(function(result){
                    if(result){
                        result.context = {
                            user: req.user
                        }
                    }
                    return result;
                });
            };
        });
        // Make req.context.build and inject user to result
        singleNoPromise.forEach(function(name){
            req.context[name] = function(){
                var model = arguments[0];
                // Strip model from arguments
                Array.prototype.shift.apply(arguments);
                // Apply original function
                var result = model[name].apply(model, arguments);
                if(result){
                    result.context = {
                        user: req.user
                    }
                }
                return result;
            };
        });
        next();
    });
}