Create a small web project with crud addition, deletion, modification, and query operations using the method of creating Scaffold

[1] Create a rails project. We will name this project scaffoldtest.

[2] configure the config/database. yml file, that is, configure the database. Of course, you must first create the corresponding database

[3] use the generate tool or the following code on the command line after the new one is created:

$ Script/generate scaffold contact name: String Email: String

This is the core command, meaning to create a model layer object contact, which has two fields: Name (Data Type: string) and email (Data Type: string)

[3] If there is no accident, it should be successful. Go to the Controller, model, and view folders in the app folder and check that crud already exists, four template views are displayed: edit.html.erbw.index.html.erb;new.html.erb;show.html. ERB

[4] Run the $ rake DB: migrate command to run the code generated in the DB folder and create the table and its fields in the database.

[5] restart the server and check it in the browser!

The generated contacts_controller.rb is as follows:

Class contactscontroller <applicationcontroller <br/> # Get/contacts. XML <br/> def index <br/> @ contacts = contact. all <br/> respond_to do | format | <br/> format.html # index.html. ERB <br/> format. XML {render: XML =>@ contacts} <br/> end <br/> # Get/contacts/1 <br/> # Get/contacts/1.xml< br/> def show <br/> @ Contact = contact. find (Params [: Id]) <br/> respond_to do | format | <br/> format.html # show.html. ERB <br/> format. XML {render: xml => @ Contact} <br/> end <br/> # Get/contacts/New. XML <br/> def new <br/> @ Contact = contact. new <br/> respond_to do | format | <br/> format.html # new.html. ERB <br/> format. XML {render: xml => @ Contact} <br/> end <br/> # Get/contacts/1/edit <br/> def edit <br/> @ Contact = contact. find (Params [: Id]) <br/> end <br/> # post/contacts. XML <br/> def create <br/> @ Contact = contact. new (Params [: Contact]) <br/> respond_to do | format | <br/> If @ Contact. save <br/> FLASH [: Notice] = 'Contact was successfully created. '<br/> format.html {redirect_to (@ Contact)} <br/> format. XML {render: XML =>@ contact,: Status =>: created,: Location =>@ contact }< br/> else <br/> format.html {render: action => "new"} <br/> format. XML {render: xml => @ Contact. errors,: Status =>: unprocessable_entity} <br/> end <br/> # Put/contacts/1 <br/> # Put/contacts/1.xml< br/> def update <br/> @ Contact = contact. find (Params [: Id]) <br/> respond_to do | format | <br/> If @ Contact. update_attributes (Params [: Contact]) <br/> FLASH [: Notice] = 'Contact was successfully updated. '<br/> format.html {redirect_to (@ Contact)} <br/> format. XML {head: OK} <br/> else <br/> format.html {render: Action => "edit"} <br/> format. XML {render: xml => @ Contact. errors,: Status =>: unprocessable_entity} <br/> end <br/> # delete/contacts/1 <br/> # delete/contacts/1.xml< br/> def destroy <br/> @ Contact = contact. find (Params [: Id]) <br/> @ Contact. destroy <br/> respond_to do | format | <br/> format.html {redirect_to (contacts_url)} <br/> format. XML {head: OK} <br/> end <br/>

[PS] If this command fails, it may be because of a rails version problem. For details, refer to here:

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