如何在Hanami控制台中删除数据库记录？

I totally get the confusion—Hanami uses a repository pattern instead of Rails' ActiveRecord, so the workflow is a bit different but straightforward once you get the hang of it. Here's how to replicate that Rails console delete operation in Hanami:

Step 1: Launch the Hanami Console #

First, open the Hanami console (just like rails c in Rails):

hanami console
# Or the shorthand:
hanami c

Step 2: Access the Repository #

In Hanami, all database operations are handled by repositories (your entities are pure Ruby objects with no database logic baked in). For your Record entity, you'll need its corresponding RecordRepository (auto-generated if you used Hanami generators, or defined by you).

You can get an instance of the repository in two ways:

• Directly initialize it:

  repo = RecordRepository.new
  

• (Hanami 2.x only) Use the application's dependency injector:

  repo = Application['repositories.record']
  

Step 3: Find the Target Record #

Use the repository to query for your record—this is similar to Rails, but routed through the repo:

# Find by a specific attribute (works like Rails' find_by)
record = repo.find_by(name: 'Test Record')

# Or use `where` + `first` if you prefer that syntax
record = repo.where(name: 'Test Record').first

Step 4: Delete the Record #

Once you have the record, use the repository's delete method to remove it from the database:

repo.delete(record)

Bonus: Direct Delete by ID #

If you already know the record's ID, you can skip finding it first and delete directly:

repo.delete(123) # Replace 123 with your record's ID

Key Difference from Rails #

Unlike Rails' ActiveRecord (where models handle both data and database operations), Hanami separates concerns:

• Entities: Plain Ruby objects that hold your data (no database methods)
• Repositories: Classes dedicated to database queries and persistence

This keeps your domain logic clean and decoupled from database specifics!

内容的提问来源于stack exchange，提问作者Cameron