tohchye / dm-more fork watch download tarball
public
Fork of sam/dm-more
Description: Extras for DataMapper, including bridges to DataObjects::Migrations and Merb::DataMapper
Homepage: http://datamapper.org
Clone URL: git://github.com/tohchye/dm-more.git 
Count distinct field when :unique => true
tohchye (author)
Fri Jul 18 01:21:46 -0700 2008
commit  66b7b5c6e91b86fe8ebd8712c0193e65fff9b7f6
tree    0a5ce40fbd77b17bbca0bdb0668948e3f74ab23f
parent  0a8eab9da694666bc4544288bb729f4319e3ec6f
0
dm-aggregates/lib/dm-aggregates/adapters/data_objects_adapter.rb 
...
48
49
50
51
 
 
 
 
 
 
52
53
54
 
55
56
57
...
59
60
61
62
 
63
64
65
66
 
 
67
68
69
 
...
48
49
50
 
51
52
53
54
55
56
57
58
 
59
60
61
62
...
64
65
66
 
67
68
69
70
 
71
72
73
74
75
 
0
@@ -48,10 +48,15 @@ module DataMapper
0
 
0
         alias original_property_to_column_name property_to_column_name
0
 
0
-        def property_to_column_name(repository, property, qualify)
0
+        def fields_statement(query)
0
+          qualify = query.links.any?
0
+          query.fields.map { |p| property_to_column_name(query.repository, p, qualify, query.unique?) } * ', '
0
+        end
0
+        
0
+        def property_to_column_name(repository, property, qualify, unique=false)
0
           case property
0
             when Query::Operator
0
-              aggregate_field_statement(repository, property.operator, property.target, qualify)
0
+              aggregate_field_statement(repository, property.operator, property.target, qualify, unique)
0
             when Property
0
               original_property_to_column_name(repository, property, qualify)
0
             else
0
@@ -59,11 +64,12 @@ module DataMapper
0
           end
0
         end
0
 
0
-        def aggregate_field_statement(repository, aggregate_function, property, qualify)
0
+        def aggregate_field_statement(repository, aggregate_function, property, qualify, unique=false)
0
           column_name = if aggregate_function == :count && property == :all
0
             '*'
0
           else
0
-            property_to_column_name(repository, property, qualify)
0
+            unique ? "distinct #{property_to_column_name(repository, property, qualify)}" :
0
+              property_to_column_name(repository, property, qualify)
0
           end
0
 
0
           function_name = case aggregate_function

Comments

    No one has commented yet.