Rails包含模型关联

Question

is there a way to load model association without eager loading? im trying to push an object to the browser with model associations included.

push_to_user pushes the @todo object to the browser. a javascript listener will read the data and print it out.

The issue im having is that @todo doesn't include its model association (eg "categories"). how can i include that?

@todo = Todo.find(1)
puts @todo.item.categories  # eager load categories. works

# push object to pusher
Pusher.push_to_user(@todo, user)

# custom pusher method
def self.push_to_user(todo, user)
    Pusher['private-1'].trigger('activity', {:todo => todo, :user => user})
end

# Browser
console.log(todo) # categories are missing

thanks pete

Answer 1

I think the better is add a new key with this categories :

def self.push_to_user(todo, user)
    Pusher['private-1'].trigger('activity', {:todo => todo, :categories => todo.categories, :user => user})
end

Answer 2

You can call a #serializable_hash method on your todo with an :include => categories

def self.push_to_user(todo, user)
    Pusher['private-1'].trigger('activity', {:todo => todo.serializable_hash(:include => :categories), :user => user})
end

I don't test this solution but can works.