rails查找模型而无需加载相关的关联

Question

My rails application has two models, gallery and photo. Galleries have many photos and photos belong to one gallery.

When I delete a photo, I noticed that rails also loads the gallery - which I do not need. It is an added database query.

When I find the photo to delete, I use @photo = Photo.find(params[:id]) . This loads the association.

I know that there is @photo = Photo.find(params[:id], :include => :gallery) , which tells it to load the gallery. What is the opposite of this? I tried the following:

@photo = Photo.find(params[:id], :include => [])
@photo = Photo.find(params[:id], :include => nil)

I also tried to select only the fields that I need in order to delete the photo, but I need the gallery_id in order to delete the actual file because the path of the file is based off the gallery. This just ends up loading the gallery too.

Edit: My Photo model looks like this:

class Photo < ActiveRecord::Base
    belongs_to :gallery

    mount_uploader :file, PhotoUploader
end

mount_uploader is from carrierwave . I have an uploader with the following code in it:

def store_dir_base
    "galleries/#{model.gallery.id}/"
end

Could it be the culprit?

Thanks!

Answer 1

The reason this was happening was because of my uploader code that I used for carrierwave.

This code was accessing the gallery model, when all I needed to access was the id:

def store_dir_base
    "galleries/#{model.gallery.id}/"
end

All I had to do was change it to:

def store_dir_base
    "galleries/#{model.gallery_id}/"
end

This made it so I was accessing the photo model column gallery_id instead of the gallery model.