Ruby on Rails: A Complete Guide To Ruby On Rails , 2nd Edition by mEm lnc & Rufus Stewart

Author:mEm lnc & Rufus Stewart [lnc, mEm]
Language: eng
Format: azw3
Published: 2020-10-15T16:00:00+00:00

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Read and write CRUD data

CRUD is the abbreviation of the following four words: Create, Read, Update and Delete. Active Record automatically creates functions that allow an application to read and modify the data within its tables.

Create command

Objects in Active Record can be created using the hash window icon or their properties can be set manually after they are defined. A new function will output a new object. The create function will output a new object and save it in the database. For example, assuming a model named User and its name and occupation properties, the method function will create the form and save it to the database.

user = User.create (name: "David", occupation: "Code Artist")

Using the new function will create the object but not save it

user = User.new

user.name = "David"

user.occupation = "Code Artist"

And when you type user.save, the object will be saved in the database. Assuming a pre-block exists, both the creat and new commands will initially subject that object to block.

user = User.new do | u |

u.name = "David"

u.occupation = "Code Artist"

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