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ActiveRecord::Base indicates that the ActiveRecord class or module has a static inner class called Base that you're extending.
One of the primary aspects of ActiveRecord is that there is very little to no configuration needed. It follow convention over configuration. ActiveRecord is commonly used with the Ruby-on-Rails framework but you can use it with Sinatra or without any web framework if desired.
Reloads the attributes of object(here @user) from the database. It always ensures object has latest data that is currently stored in database.
Active Record is the M in MVC - the model - which is the layer of the system responsible for representing business data and logic. Active Record facilitates the creation and use of business objects whose data requires persistent storage to a database.
The answer is yes!
Blog.reset_column_information
I always used new models in migrations
MyBlog < ActiveRecord::Base
set_table_name 'blogs'
end
def self.up
MyBlog.all.each do |blog|
update_some_blog_attributes_to_match_new_schema
end
end
But Blog.reset_column_information is more convenient.
Create new instances:
Old_blogs = Blog.all
# change/modify db table in here
New_blogs = Blog.all # this should be reloaded or you could use the .reload on this
# change information, load old into new
Old_blogs.each do |blog|
New_blogs.find(blog.id).title = blog.title
end
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