CODEWITHSUNDEEP
ruby-on-rails
user3180
user3180

Reputation: 1497

How does Ruby syntax for inputting arguments work?

<%= f.label :password %>
<%= f.password_field :password, class: 'form-control' %>

The method signature of password_field is:

      def password_field(object_name, method, options = {})
  1. In the "... f.password_field :password..." line, are two arguments getting passed into password_field? So it's the same as "f.password_field(:password, class: 'form-control')?
  2. According to the method signature of pw_field, ":password" should be an object. However, it's a symbol which as I understand is more like a string than a pointer. How does inputting this as an object make sense?
  3. Why is the "class: 'form-control'" argument a method? It doesn't seem like a method to me, but it's not a hash so I assume it should not be the "options" in the method signature...

Upvotes: 1

Views: 32

Answers (1)

Roman Kiselenko
Roman Kiselenko

Reputation: 44380

In the "... f.password_field :password..." line, are two arguments getting passed into password_field? So it's the same as "f.password_field(:password, class: 'form-control')?

f.password_field :password, class: 'form-control' - here you pass two arguments to f.password_field function

According to the method signature of pw_field, ":password" should be an object. However, it's a symbol which as I understand is more like a string than a pointer. How does inputting this as an object make sense?

It is not an object, is object_name object name

Why is the "class: 'form-control'" argument a method? It doesn't seem like a method to me, but it's not a hash so I assume it should not be the "options" in the method signature..

class: 'form-control' it is not a method, is an argument, also is a hash.

How does "class: 'form-control'" get evaluated into HTML (and what resource tells me how that happens)?

With FormBuilder. It's generate the html under the hood and use "class: 'form-control'" argument to set the class.

Also with object_name, is the object name automatically a pointer to an object?

object_name it is a name of the attribute of the model which you're using. password_field function do not know, the form builder know.

I suggest you to read Ruby Basic

Upvotes: 1

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