rails-generate:tldr:c40a0
rails-generate: Generate a new migration that adds a category attribute to an existing model called Post.
$ rails generate migration ${AddCategoryToPost} ${category:string}
try on your machine
This command is used in Ruby on Rails framework to create a migration file, which is responsible for managing changes to the database schema.
Let's break down the command:
rails: This is the command-line tool used for interacting with the Rails framework.generate migration: This is the specific command to generate a new migration file.${AddCategoryToPost}: This is the name given to the migration file. It follows the convention of "Add[Column(s)]To[Table]" to make it more descriptive and intuitive. In this case, it suggests that a "category" column will be added to the "posts" table.${category:string}: This specifies the column(s) to be added to the table. In this case, it is creating a column named "category" with the data type of "string". "String" represents a variable-length character string.
By running this command, Rails will generate a new migration file with a timestamp and a name that reflects the purpose of the migration. The migration file will contain instructions for adding the "category" column to the "posts" table in the database.
This explanation was created by an AI. In most cases those are correct. But please always be careful and
never run a command you are not sure if it is safe.