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Undid previous change which violated the convention regarding output (use "# =>") used in these guides. Corrected typo in previous correction. (Thanks for pointing this out, vijaydev.)

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Manuel Menezes de Sequeira 2011-10-06 21:29:58 +01:00
parent cde529448b
commit 29bf193cad
1 changed files with 13 additions and 13 deletions
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26
railties/guides/source/active_record_querying.textile
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@ -87,7 +87,7 @@ Using <tt>Model.find(primary_key)</tt>, you can retrieve the object correspondin
<ruby> <ruby>
# Find the client with primary key (id) 10. # Find the client with primary key (id) 10.
client = Client.find(10) client = Client.find(10)
=> #<Client id: 10, first_name: "Ryan"> # => #<Client id: 10, first_name: "Ryan">
</ruby> </ruby>
The SQL equivalent of the above is: The SQL equivalent of the above is:
@ -104,7 +104,7 @@ h5. +first+
<ruby> <ruby>
client = Client.first client = Client.first
=> #<Client id: 1, first_name: "Lifo"> # => #<Client id: 1, first_name: "Lifo">
</ruby> </ruby>
The SQL equivalent of the above is: The SQL equivalent of the above is:
@ -121,7 +121,7 @@ h5. +last+
<ruby> <ruby>
client = Client.last client = Client.last
=> #<Client id: 221, first_name: "Russel"> # => #<Client id: 221, first_name: "Russel">
</ruby> </ruby>
The SQL equivalent of the above is: The SQL equivalent of the above is:
@ -138,7 +138,7 @@ h5(#first_1). +first!+
<ruby> <ruby>
client = Client.first! client = Client.first!
=> #<Client id: 1, first_name: "Lifo"> # => #<Client id: 1, first_name: "Lifo">
</ruby> </ruby>
The SQL equivalent of the above is: The SQL equivalent of the above is:
@ -155,7 +155,7 @@ h5(#last_1). +last!+
<ruby> <ruby>
client = Client.last! client = Client.last!
=> #<Client id: 221, first_name: "Russel"> # => #<Client id: 221, first_name: "Russel">
</ruby> </ruby>
The SQL equivalent of the above is: The SQL equivalent of the above is:
@ -175,7 +175,7 @@ h5. Using Multiple Primary Keys
<ruby> <ruby>
# Find the clients with primary keys 1 and 10. # Find the clients with primary keys 1 and 10.
client = Client.find([1, 10]) # Or even Client.find(1, 10) client = Client.find([1, 10]) # Or even Client.find(1, 10)
=> [#<Client id: 1, first_name: "Lifo">, #<Client id: 10, first_name: "Ryan">] # => [#<Client id: 1, first_name: "Lifo">, #<Client id: 10, first_name: "Ryan">]
</ruby> </ruby>
The SQL equivalent of the above is: The SQL equivalent of the above is:
@ -252,7 +252,7 @@ Invoice.find_in_batches(:include => :invoice_lines) do |invoices|
end end
</ruby> </ruby>
The above will each time yield to the supplied block an arrays of 1000 invoices (or the remaining invoices, if less than 1000). The above will each time yield to the supplied block an array of 1000 invoices (or the remaining invoices, if less than 1000).
NOTE: The +:include+ option allows you to name associations that should be loaded alongside with the models. NOTE: The +:include+ option allows you to name associations that should be loaded alongside with the models.
@ -1032,7 +1032,7 @@ Suppose you want to find a client named 'Andy', and if there's none, create one
<ruby> <ruby>
Client.where(:first_name => 'Andy').first_or_create(:locked => false) Client.where(:first_name => 'Andy').first_or_create(:locked => false)
=> #<Client id: 1, first_name: "Andy", orders_count: 0, locked: false, created_at: "2011-08-30 06:09:27", updated_at: "2011-08-30 06:09:27"> # => #<Client id: 1, first_name: "Andy", orders_count: 0, locked: false, created_at: "2011-08-30 06:09:27", updated_at: "2011-08-30 06:09:27">
</ruby> </ruby>
The SQL generated by this method looks like this: The SQL generated by this method looks like this:
@ -1070,7 +1070,7 @@ to your +Client+ model. If you try to create a new +Client+ without passing an +
<ruby> <ruby>
Client.where(:first_name => 'Andy').first_or_create!(:locked => false) Client.where(:first_name => 'Andy').first_or_create!(:locked => false)
=> ActiveRecord::RecordInvalid: Validation failed: Orders count can't be blank # => ActiveRecord::RecordInvalid: Validation failed: Orders count can't be blank
</ruby> </ruby>
h4. +first_or_initialize+ h4. +first_or_initialize+
@ -1079,13 +1079,13 @@ The +first_or_initialize+ method will work just like +first_or_create+ but it wi
<ruby> <ruby>
nick = Client.where(:first_name => 'Nick').first_or_initialize(:locked => false) nick = Client.where(:first_name => 'Nick').first_or_initialize(:locked => false)
=> <Client id: nil, first_name: "Nick", orders_count: 0, locked: false, created_at: "2011-08-30 06:09:27", updated_at: "2011-08-30 06:09:27"> # => <Client id: nil, first_name: "Nick", orders_count: 0, locked: false, created_at: "2011-08-30 06:09:27", updated_at: "2011-08-30 06:09:27">
nick.persisted? nick.persisted?
=> false # => false
nick.new_record? nick.new_record?
=> true # => true
</ruby> </ruby>
Because the object is not yet stored in the database, the SQL generated looks like this: Because the object is not yet stored in the database, the SQL generated looks like this:
@ -1098,7 +1098,7 @@ When you want to save it to the database, just call +save+:
<ruby> <ruby>
nick.save nick.save
=> true # => true
</ruby> </ruby>
h3. Finding by SQL h3. Finding by SQL