I have seen this answer and have created a solution to match my needs. However, just for fun, I decided to make another variation without async and start my descent into callback hell. Here's the async version
async.auto
(
{
restaurant: function(cb)
{
Restaurant.findOne
(
{
where:
{
owner: req.session.owner.id,
id: req.params.id
}
}
)
.populate('categories')
.exec(cb);
},
categoryItems:
[
'restaurant',
function(cb, results)
{
Item.find
(
{
where:
{
category: _.pluck(results.restaurant.categories, 'id')
}
}
)
.exec(cb);
}
],
map:
[
'categoryItems',
function(cb, results)
{
var categoryItems = _.groupBy(results.categoryItems, 'category');
var restaurant = results.restaurant.toObject();
restaurant.categories = restaurant.categories.map
(
function(category)
{
category.items = categoryItems[category.id];
return category;
}
);
return cb(null, restaurant);
}
]
},
function finish(err, results)
{
if(err)
{
res.serverError(err);
}
else
{
res.json(_.cloneDeep(results.map));
}
}
);
and here's the callback hell version.
Restaurant.findOne
(
{
where:
{
owner: req.session.owner.id,
id: req.params.id
}
}
)
.populate('categories')
.exec
(
function(err, restaurant)
{
if(err)
{
res.serverError(err);
}
else if(typeof restaurant === 'undefined')
{
res.notFound();
}
else
{
if(typeof restaurant.categories === "undefined" || restaurant.categories === null || restaurant.categories.length === 0)
{
sails.log.info("i got nuthin")
}
else
{
Item.find
(
{
where:
{
category: _.pluck(restaurant.categories, 'id')
}
}
)
.exec
(
function(err, items)
{
if(err)
{
res.serverError(err);
}
else if(typeof items === 'undefined' || items === null || items.length === 0)
{
sails.log.info(':(');
}
else
{
var categoryItems = _.groupBy(items, 'category');
var restaurant = restaurant.toObject();
restaurant.categories = restaurant.categories.map
(
function(category)
{
category.items = categoryItems[category.id];
return category;
}
);
res.json(restaurant);
}
}
);
}
}
}
);
However, I'm getting TypeError: Cannot call method 'toObject' of undefined from var restaurant = restaurant.toObject(); Why? Why am I not able to access the restaurant variable? I could access it just fine for the where clause.
