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[ci skip] Remove duplicated last! section.

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Reference: d4fd0bd177

cc @schneems
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Juanito Fatas 2014-07-16 23:12:13 +08:00
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guides/source/active_record_querying.md
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@ -267,23 +267,6 @@ This is equivalent to writing:
Client.where(first_name: 'does not exist').take!
```
#### `last!`
`Model.last!` finds the last record ordered by the primary key. For example:
```ruby
client = Client.last!
# => #<Client id: 221, first_name: "Russel">
```
The SQL equivalent of the above is:
```sql
SELECT * FROM clients ORDER BY clients.id DESC LIMIT 1
```
`Model.last!` raises `ActiveRecord::RecordNotFound` if no matching record is found.
### Retrieving Multiple Objects in Batches
We often need to iterate over a large set of records, as when we send a newsletter to a large set of users, or when we export data.