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体验新版 GitCode,发现更多精彩内容 >>
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9a2ad60f
编写于
11月 09, 2016
作者:
R
Robert Speicher
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Add more highlighting to Migration Style Guide doc
[ci skip]
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doc/development/migration_style_guide.md
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doc/development/migration_style_guide.md
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...
...
@@ -60,7 +60,7 @@ migration was tested.
If you need to remove index, please add a condition like in following example:
```
```
ruby
remove_index
:namespaces
,
column: :name
if
index_exists?
(
:namespaces
,
:name
)
```
...
...
@@ -75,7 +75,7 @@ need for downtime. To use this method you must disable transactions by calling
the method
`disable_ddl_transaction!`
in the body of your migration class like
so:
```
```
ruby
class
MyMigration
<
ActiveRecord
::
Migration
include
Gitlab
::
Database
::
MigrationHelpers
disable_ddl_transaction!
...
...
@@ -96,7 +96,7 @@ the `up` and `down` methods in your migration class.
For example, to add the column
`foo`
to the
`projects`
table with a default
value of
`10`
you'd write the following:
```
```
ruby
class
MyMigration
<
ActiveRecord
::
Migration
include
Gitlab
::
Database
::
MigrationHelpers
disable_ddl_transaction!
...
...
@@ -125,7 +125,7 @@ set the limit to 8-bytes. This will allow the column to hold a value up to
Rails migration example:
```
```
ruby
add_column_with_default
(
:projects
,
:foo
,
:integer
,
default:
10
,
limit:
8
)
# or
...
...
@@ -145,7 +145,7 @@ Please prefer Arel and plain SQL over usual ActiveRecord syntax. In case of usin
Example with Arel:
```
```
ruby
users
=
Arel
::
Table
.
new
(
:users
)
users
.
group
(
users
[
:user_id
]).
having
(
users
[
:id
].
count
.
gt
(
5
))
...
...
@@ -154,7 +154,7 @@ users.group(users[:user_id]).having(users[:id].count.gt(5))
Example with plain SQL and
`quote_string`
helper:
```
```
ruby
select_all
(
"SELECT name, COUNT(id) as cnt FROM tags GROUP BY name HAVING COUNT(id) > 1"
).
each
do
|
tag
|
tag_name
=
quote_string
(
tag
[
"name"
])
duplicate_ids
=
select_all
(
"SELECT id FROM tags WHERE name = '
#{
tag_name
}
'"
).
map
{
|
tag
|
tag
[
"id"
]}
...
...
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