awesome_nested_set adding a new category

in this example what if i didn't have a values for science, physics and gravity but had to get it from form what field would i use? my guess any of the 3 variables can be substituted with params[:id] ?

Create a root node:

science = Category.create!(:name => 'Science')

Put a new thing inside this root node:

physics = Category.create!(:name => 'Physics')
physics.move_to_child_of(science)

Put another thing inside the “physics” node:

gravity = Category.create!(:name => 'Gravity')
gravity.move_to_child_of(physics)

Again, unfortunately, I have little idea of exactly what you are
asking. If the form is generated by
form_for @category
then 'name' would be one of the fields expected to be in the form, so
you should be able to do
Category.create!(params[:category])
though it would be more usual to use new and save and then check the
return value of save in case there were validation errors.

Colin

Why not Category.create!(category_params)
instead of Category.create!(params[:category])
? thanks

isn’t params[:category] a reference to a single field and not all the params from the form

params[:category] is identical to category_params. As an old hand I
don't necessarily make use of later useful syntactical goodies in
rails. Look at the params structure in the controller and you will
see how the hash is organised. In fact I am not sure whether I like
using category_params as it is not obvious exactly what is being
referred to, whereas params[:category] can only refer to the category
hash within the params hash.

Colin