diff options
Diffstat (limited to 'guides/source')
| -rw-r--r-- | guides/source/active_record_querying.textile | 18 | ||||
| -rw-r--r-- | guides/source/active_support_core_extensions.textile | 14 | ||||
| -rw-r--r-- | guides/source/layouts_and_rendering.textile | 6 |
3 files changed, 18 insertions, 20 deletions
diff --git a/guides/source/active_record_querying.textile b/guides/source/active_record_querying.textile index a9cb424eaa..294ef25b33 100644 --- a/guides/source/active_record_querying.textile +++ b/guides/source/active_record_querying.textile @@ -1260,6 +1260,24 @@ with Client.pluck(:id) </ruby> +h3. +ids+ + ++ids+ can be used to pluck all the IDs for the relation using the table's primary key. + +<ruby> +Person.ids +# SELECT id FROM people +</ruby> + +<ruby> +class Person < ActiveRecord::Base + self.primary_key = "person_id" +end + +Person.ids +# SELECT person_id FROM people +</ruby> + h3. Existence of Objects If you simply want to check for the existence of the object there's a method called +exists?+. This method will query the database using the same query as +find+, but instead of returning an object or collection of objects it will return either +true+ or +false+. diff --git a/guides/source/active_support_core_extensions.textile b/guides/source/active_support_core_extensions.textile index 80da1110d7..6443255f5d 100644 --- a/guides/source/active_support_core_extensions.textile +++ b/guides/source/active_support_core_extensions.textile @@ -1277,20 +1277,6 @@ The <tt>inquiry</tt> method converts a string into a +StringInquirer+ object mak "active".inquiry.inactive? # => false </ruby> -h4. Key-based Interpolation - -In Ruby 1.9 the <tt>%</tt> string operator supports key-based interpolation, both formatted and unformatted: - -<ruby> -"Total is %<total>.02f" % {:total => 43.1} # => Total is 43.10 -"I say %{foo}" % {:foo => "wadus"} # => "I say wadus" -"I say %{woo}" % {:foo => "wadus"} # => KeyError -</ruby> - -Active Support adds that functionality to <tt>%</tt> in previous versions of Ruby. - -NOTE: Defined in +active_support/core_ext/string/interpolation.rb+. - h4. +starts_with?+ and +ends_with?+ Active Support defines 3rd person aliases of +String#start_with?+ and +String#end_with?+: diff --git a/guides/source/layouts_and_rendering.textile b/guides/source/layouts_and_rendering.textile index e4a1fd6951..b0a87a5981 100644 --- a/guides/source/layouts_and_rendering.textile +++ b/guides/source/layouts_and_rendering.textile @@ -860,12 +860,6 @@ You can supply a hash of additional HTML options: <%= image_tag "icons/delete.gif", {:height => 45} %> </erb> -You can also supply an alternate image to show on mouseover: - -<erb> -<%= image_tag "home.gif", :onmouseover => "menu/home_highlight.gif" %> -</erb> - You can supply alternate text for the image which will be used if the user has images turned off in their browser. If you do not specify an alt text explicitly, it defaults to the file name of the file, capitalized and with no extension. For example, these two image tags would return the same code: <erb> |