通过键/值的散列进行映射

Question

I have a form being submitted that is saving multiple records, and the parameters look something like this:

{
  "utf8"=>"✓",
  "_method"=>"put",
  "products"=> {
    "321" => {
        "sale_price"=>"10"
    },
    "104" => {
        "sale_price"=>"10"
    }
  }
}

Then in my controller, I have this:

@updated_products = Product.update(params[:products].keys, params[:products].values)

This expects the keys (321, 104) to be IDs.
However, I'm using the to_param in my model to change my urls from IDs to another column value.

Is there a way to take the params[:products].keys and swap them for the appropriate IDs so I can use IDs in the .update() statement. I can use Product.find_by_column_name(321).id to get the id although I don't know how to do this. Still new to rails.

Any help would be appreciated. Thanks.

Answer 1

Looking at the source code here #update iterates through each key and runs update_attributes so it goes through all the validations. You can change your method to

@updated_products = params[:products].inject([]) do |array, (column_id, attributes)|
  product = Product.find_by_column_id column_id
  if product.update_attributes(attributes)
    array << product
  else
    array
  end
end

This may seem a little complex but it is equal to this one below which is easier to understand and code read

@updated_products = []

params[:products].each do |column_id, attributes|
  product = Product.find_by_column_id column_id
  if product.update_attributes(attributes)
    @updated_products << product
  end
end