What's the difference between these two possibilities?
//com @
@post = Post.find(params[:id])
//sem @
post = Post.find(params[:id])
Usually in controllers it is used with @ , but in functions each of views is usually used without @ , for example.
Are there performance differences?
variables that have @ are instance variables in the scope of the current object.
the variables without @ are local variables in the scope of the current object.
In the specific case of Rails, the variables with @ used in the controllers are made available to be used "inside" the views.
For the each that was quoted follow the example below:
@posts.each do |post|
<faz alguma coisa com 'post' aqui>
end
In this code snippet, the variable post is local to the scope of the block in which it was set, so it only exists inside the block do |post| ... end
To better understand the differences between variable types, classes, and objects, take a look at this link link .
About each , look here link
This is how Bruno said the variables without the @ can only be accessed within the scope of creation, in case if you create in the controller, you will not be able to access the variable in the view.