awesome_nested_set adding a new category

rubyonrails-talk
1 
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)
2

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

3

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

4

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

5

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