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-rw-r--r--guides/source/active_record_querying.textile30
1 files changed, 10 insertions, 20 deletions
diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile
index 33b4a35edd..5ea3edd6a0 100644
--- a/guides/source/active_record_querying.textile
+++ b/guides/source/active_record_querying.textile
@@ -985,15 +985,17 @@ To define a simple scope, we use the +scope+ method inside the class, passing th
<ruby>
class Post < ActiveRecord::Base
- scope :published, where(:published => true)
+ scope :published, -> { where(published: true) }
end
</ruby>
-Just like before, these methods are also chainable:
+This is exactly the same as defining a class method, and which you use is a matter of personal preference:
<ruby>
class Post < ActiveRecord::Base
- scope :published, where(:published => true).joins(:category)
+ def self.published
+ where(published: true)
+ end
end
</ruby>
@@ -1001,8 +1003,8 @@ Scopes are also chainable within scopes:
<ruby>
class Post < ActiveRecord::Base
- scope :published, where(:published => true)
- scope :published_and_commented, published.and(self.arel_table[:comments_count].gt(0))
+ scope :published, -> { where(:published => true) }
+ scope :published_and_commented, -> { published.and(self.arel_table[:comments_count].gt(0)) }
end
</ruby>
@@ -1019,25 +1021,13 @@ category = Category.first
category.posts.published # => [published posts belonging to this category]
</ruby>
-h4. Working with times
-
-If you're working with dates or times within scopes, due to how they are evaluated, you will need to use a lambda so that the scope is evaluated every time.
-
-<ruby>
-class Post < ActiveRecord::Base
- scope :created_before_now, lambda { where("created_at < ?", Time.zone.now ) }
-end
-</ruby>
-
-Without the +lambda+, this +Time.zone.now+ will only be called once.
-
h4. Passing in arguments
-When a +lambda+ is used for a +scope+, it can take arguments:
+You scope can take arguments:
<ruby>
class Post < ActiveRecord::Base
- scope :created_before, lambda { |time| where("created_at < ?", time) }
+ scope :created_before, ->(time) { where("created_at < ?", time) }
end
</ruby>
@@ -1084,7 +1074,7 @@ If we wish for a scope to be applied across all queries to the model we can use
<ruby>
class Client < ActiveRecord::Base
- default_scope where("removed_at IS NULL")
+ default_scope { where("removed_at IS NULL") }
end
</ruby>