1 -- | Modifications to the code generation used in Groundhog.
5 tsn_db_field_namer -- Used in a TSN.XML.News test.
9 import Data.Char ( toUpper )
10 import Data.List.Utils ( join, split )
11 import Database.Groundhog.TH (
12 CodegenConfig ( namingStyle ),
13 NamingStyle ( mkDbFieldName, mkExprFieldName ),
15 lowerCaseSuffixNamingStyle )
18 -- | The lowercase naming style for database entities, provided by
19 -- Groundhog. Makes a better starting point than the default.
21 lowercase_ns :: NamingStyle
22 lowercase_ns = lowerCaseSuffixNamingStyle
25 -- | A database field name creator. It takes the field name (from a
26 -- record type) and drops the first component determined by
27 -- underscores. So, foo_bar_baz would get mapped to bar_baz in the
32 -- >>> tsn_db_field_namer "herp" "derp" 0 "xml_player_name" 0
35 tsn_db_field_namer :: String -> String -> Int -> String -> Int -> String
36 tsn_db_field_namer _ _ _ fieldname _ =
37 (join "_") . tail . (split "_") $ fieldname
39 -- | An expression field name creator. \"Expression\" in the context
40 -- of Groundhog means a constructor/type that you can use in queries
41 -- and update statement. We take the field name (from a record type)
42 -- as an argument and capitalize the first letter of each word.
46 -- >>> tsn_expr_field_namer "herp" "derp" 0 "foo_bar" 0
49 tsn_expr_field_namer :: String -> String -> Int -> String -> Int -> String
50 tsn_expr_field_namer _ _ _ fieldname _ =
51 (join "_") . (map capitalize) . (split "_") $ fieldname
54 capitalize (c:cs) = (toUpper c : cs)
57 -- | Combine the modifications above into a new naming style based on
60 tsn_naming_style :: NamingStyle
61 tsn_naming_style = lowercase_ns { mkDbFieldName = tsn_db_field_namer,
62 mkExprFieldName = tsn_expr_field_namer }
64 -- | Create a 'CodegenConfig' by replacing the default 'namingStyle'
65 -- with our modified version.
67 tsn_codegen_config :: CodegenConfig
69 defaultCodegenConfig { namingStyle = tsn_naming_style }