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Controllers handle web requests from users and interact with views and models. Views display templates filled with application data and convert it to HTML. Models represent and wrap application data stored in the database. Helpers assist models, views, and controllers. Common Rails methods include link_to for creating links and migrations for modifying the database schema by adding, removing, or changing columns.
![Architecture Rails:
Controllers: Rails look to find controllers classes. A controllers handles a web request from user.
Views: Holds the display templates to fill in with data from our application, convert to HTML, and
return to the user's browser.
Models: Holds the classes that model and wrap the data stored in our application's database.
Helpers: Holds any helper classes used to assist the model, view, and controllers classes
Methods:
link_to → creates a hyperlink to an action
example: <%= link_to "Hello", say_hello_path %>
Marshaling Objects: Take an object and convert it into a stream of bytes that can be stored outside the
app.
rails generate migration add_columnname_to_tablename columnname:datatype
example: rails generate migration add_password_to_users password:string
Problem Solve Take-note
Get URL parameter path = request.fullpath
path_search = URI.parse(path)
parse_url = CGI.parse(path_search.query)
array_facility_choose = parse_url['search[facilities][]']#params['search']['facilities']
name_facility = Array.new # content all name of facility choose
search[prefecture]=&search[departments][]=3&search[facilities][]=2
To create a model
that references
another, use the
rails model
generator:
$ rails g model wheel car:references
class Wheel < ActiveRecord::Base
belongs_to :car
end
class CreateWheels < ActiveRecord::Migration](https://image.slidesharecdn.com/railsnotification-140620031548-phpapp01/85/Rails-notification-1-320.jpg)
Rails notification
- 1. Architecture Rails: Controllers: Rails look to find controllers classes. A controllers handles a web request from user. Views: Holds the display templates to fill in with data from our application, convert to HTML, and return to the user's browser. Models: Holds the classes that model and wrap the data stored in our application's database. Helpers: Holds any helper classes used to assist the model, view, and controllers classes Methods: link_to → creates a hyperlink to an action example: <%= link_to "Hello", say_hello_path %> Marshaling Objects: Take an object and convert it into a stream of bytes that can be stored outside the app. rails generate migration add_columnname_to_tablename columnname:datatype example: rails generate migration add_password_to_users password:string Problem Solve Take-note Get URL parameter path = request.fullpath path_search = URI.parse(path) parse_url = CGI.parse(path_search.query) array_facility_choose = parse_url['search[facilities][]']#params['search']['facilities'] name_facility = Array.new # content all name of facility choose search[prefecture]=&search[departments][]=3&search[facilities][]=2 To create a model that references another, use the rails model generator: $ rails g model wheel car:references class Wheel < ActiveRecord::Base belongs_to :car end class CreateWheels < ActiveRecord::Migration
- 2. def self.up create_table :wheels do |t| t.references :car t.timestamps end end ActiveRecord Products.connection.execute('UPDATE `products` SET `price`=`free` WHERE 1') If the helpers not enough Rename column script/generate migration rename_my_column_by_hand Then edit the file it creates: class RenameMyColumnByHand < ActiveRecord::Migration def self.up rename_column :my_table, :old_name, :new_name end def self.down rename_column :my_table, :new_name, :old_name end end It executes SQL like: ALTER TABLE my_table CHANGE old_name new_name BIGINT; Change type of column class AddColumnToTable < ActiveRecord::Migration def change add_column :table, :column, :type end end Rails g migration changetypecolumn Add column rails generate migration add_password_to_users password:string rails generate migration add_columnname_to_tablename