Question

I have model:

class Task
    include Mongoid::Document
    field :name, type: String
    field :category, type: String
    # ....

And I have a method to create new documents:

def self.create_task(hash)
        Task.safely.create!(name: hash["name"],
                            category: hash["category"],
                            ... );

I’m just wondering if it is possible to simplify this code and pass Ruby Hash to create!() method of Mongoid::Document ?

Something like this:

Task.safely.create!(hash)

Answer 1

This:

Task.safely.create!(name: hash["name"], category: hash["category"], ...)

is exactly the same as this:

Task.safely.create!({name: hash["name"], category: hash["category"], ...})

which is the same as this:

h = { name: hash['name'], ... }
Task.safely.create!(h)

So you can probably just do this:

Task.safely.create!(hash)

When you do something like this:

o.m(:a => 'b', :c => 'd')

Ruby notices that you’re supply a Hash literal without the usual {...} wrapping and adds it for you; this sort of thing works at the end of any argument list:

o.m(a, b, :c => 'd', :e => 'f')

is the same as:

o.m(a, b, { :c => 'd', :e => 'f' })