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175d8acf
编写于
8月 08, 2015
作者:
C
Claudio B.
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Merge pull request #21166 from brooksreese/migration_seed_explanation
[ci skip] Give in-depth explanation of migrations vs. seeds.rb
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guides/source/active_record_migrations.md
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guides/source/active_record_migrations.md
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@@ -1004,7 +1004,10 @@ such features, the `execute` method can be used to execute arbitrary SQL.
Migrations and Seed Data
------------------------
Some people use migrations to add data to the database:
The main purpose of Rails' migration feature is to issue commands that modify the
schema using a consistent process. Migrations can also be used
to add or modify data. This is useful in an existing database that can't be destroyed
and recreated, such as a production database.
```
ruby
class
AddInitialProducts
<
ActiveRecord
::
Migration
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@@ -1020,9 +1023,11 @@ class AddInitialProducts < ActiveRecord::Migration
end
```
However, Rails has a 'seeds' feature that should be used for seeding a database
with initial data. It's a really simple feature: just fill up
`db/seeds.rb`
with some Ruby code, and run
`rake db:seed`
:
To add initial data after a database is created, Rails has a built-in
'seeds' feature that makes the process quick and easy. This is especially
useful when reloading the database frequently in development and test environments.
It's easy to get started with this feature: just fill up
`db/seeds.rb`
with some
Ruby code, and run
`rake db:seed`
:
```
ruby
5
.
times
do
|
i
|
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