ActiveRecord-获取表的所有属性

Question

I am creating a gem that has to work with any possible combination of how the attributes on a Table would be configured - the specific case I'm using it for is Feedback, so we'll use that in this example:

Given the following item:

Feedback {
  :id => 1,
  :comments => "Works well",
  :recommendations => "Change this one thing"
}

I would have to extract the data as {id: 1, comments: "Works Well", recommendations: "Change this one thing"} , which if I know the particular fields Im dealing with is a no brainer. Unfortunately I need this to play nicely with any arrangement or collection of fields on the Feedback table.

So my question is this: Does Rails or ActiveRecord have a method that will allow me to simply grab all of the fields and the relevant data in a hash / is there a way to iterate over the values of an item in the database with ActiveRecord. I've tried converting the item to a Hash, using the to_params method on it, and other typical tricks for grabbing both the keys and values in key/value pairs, but to no avail.

Thanks!

Answer 1

Use the attributes method.

Like Feedback.first.attributes and you are done.

Answer 2

You can use the columns_hash class method on any active_record model.

Feedback.columns_hash

or if you just need the names of the columns, use column_names

Feedback.column_names

you can use content_columns to get only the columns that contains data, so any column, ending with _id, _count will be removed from the collection.

Feedback.content_columns