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pg guides, some stylistic changes [ci skip]

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guides/source/active_record_postgresql.md
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@ -1,14 +1,15 @@
eActive Record and PostgreSQL
Active Record and PostgreSQL
============================
This guide goes over PostgreSQL specific usage of Active Record.
How to use the PostgreSQL adapter for Active Record is described in the
[configuring Rails guide](configuring.html#configuring-a-postgresql-database).
This guide covers PostgreSQL specific usage of Active Record.
In order to use the PostgreSQL adapter you need to have at least version 8.2
installed. Older versions are not supported.
To get started with PostgreSQL have a look at the
[configuring Rails guide](configuring.html#configuring-a-postgresql-database).
It describes how to properly setup Active Record for PostgreSQL.
Datatypes
---------
@ -37,8 +38,8 @@ Document.create payload: data
### Array
* [type definition](http://www.postgresql.org/docs/9.3/static/arrays.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-array.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/arrays.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-array.html)
```ruby
# db/migrate/20140207133952_create_books.rb
@ -69,7 +70,7 @@ Book.where("array_length(ratings, 1) >= 3")
### Hstore
* [type definition](http://www.postgresql.org/docs/9.3/static/hstore.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/hstore.html)
```ruby
# db/migrate/20131009135255_create_profiles.rb
@ -100,8 +101,8 @@ profile.save!
### Json
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-json.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-json.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-json.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-json.html)
```ruby
# db/migrate/20131220144913_create_events.rb
@ -125,8 +126,8 @@ Event.where("payload->'kind' = ?", "user_renamed")
### Range Types
* [type definition](http://www.postgresql.org/docs/9.3/static/rangetypes.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-range.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/rangetypes.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-range.html)
This type is mapped to Ruby [`Range`]() objects.
@ -160,7 +161,7 @@ event.ends_at # => Thu, 13 Feb 2014
### Composite Types
* [type definition](http://www.postgresql.org/docs/9.3/static/rowtypes.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/rowtypes.html)
Currently there is no special support for composite types. They are mapped to as
normal text columns:
@ -200,7 +201,7 @@ contact.save!
### Enumerated Types
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-enum.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-enum.html)
Currently there is no special support for enumerated types. They are mapped as
normal text columns:
@ -229,8 +230,8 @@ article.save!
### UUID
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-uuid.html)
* [generator functions](http://www.postgresql.org/docs/9.3/static/uuid-ossp.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-uuid.html)
* [generator functions](http://www.postgresql.org/docs/9.3/static/uuid-ossp.html)
```ruby
@ -252,8 +253,8 @@ revision.identifier # => "a0eebc99-9c0b-4ef8-bb6d-6bb9bd380a11"
### Bit String Types
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-bit.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-bitstring.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-bit.html)
* [functions and operators](http://www.postgresql.org/docs/9.3/static/functions-bitstring.html)
```ruby
# db/migrate/20131220144913_create_users.rb
@ -276,14 +277,14 @@ user.save!
### Network Address Types
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-net-types.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-net-types.html)
The types `inet` and `cidr` are mapped to Ruby [`IPAddr`]() objects. The
`macaddr` type is mapped to normal text.
### Geometric Types
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-geometric.html)
* [type definition](http://www.postgresql.org/docs/9.3/static/datatype-geometric.html)
All geometric types are mapped to normal text.