{-# LANGUAGE GADTs #-}
{-# LANGUAGE QuasiQuotes #-}
{-# LANGUAGE RecordWildCards #-}
-{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
-- a root element \<message\> that contains an entire news item.
--
module TSN.XML.News (
+ dtd,
pickle_message,
-- * Tests
news_tests,
-- * WARNING: these are private but exported to silence warnings
- News_NewsLocationConstructor(..),
+ News_LocationConstructor(..),
News_NewsTeamConstructor(..),
NewsConstructor(..),
- NewsLocationConstructor(..),
NewsTeamConstructor(..) )
where
import Data.Typeable ( Typeable )
import Database.Groundhog (
countAll,
- executeRaw,
+ deleteAll,
insert_,
migrate,
runMigration,
xpOption,
xpPair,
xpText,
- xpTriple,
xpWrap )
-- Local imports.
import TSN.Database ( insert_or_select )
import TSN.DbImport ( DbImport(..), ImportResult(..), run_dbmigrate )
import TSN.Picklers ( xp_time_stamp )
+import TSN.Location ( Location(..), pickle_location )
import TSN.XmlImport ( XmlImport(..) )
import Xml (
FromXml(..),
unsafe_unpickle )
+-- | The DTD to which this module corresponds. Used to invoke dbimport.
+--
+dtd :: String
+dtd = "newsxml.dtd"
+
+
--
-- DB/XML Data types
--
-- * News/Message
--- | The msg_id child of <message> contains an event_id attribute; we
--- embed it into the 'News' type. We (pointlessly) use the "db_"
--- prefix here so that the two names don't collide on "id" when
+-- | The msg_id child of \<message\> contains an event_id attribute; we
+-- embed it into the 'News' type. We (pointlessly) use the \"db_\"
+-- prefix here so that the two names don't collide on \"id\" when
-- Groundhog is creating its fields using our field namer.
--
data MsgId =
xml_sport :: String,
xml_url :: Maybe String,
xml_teams :: [NewsTeam],
- xml_locations :: [NewsLocation],
+ xml_locations :: [Location],
xml_sms :: String,
xml_editor :: Maybe String,
xml_text :: Maybe String, -- Text and continue seem to show up in pairs,
-- * NewsTeam
--- | The database type for teams as they show up in the news.
+-- | The database/XML type for teams as they show up in the news. We
+-- can't reuse the representation from "TSN.Team" because they
+-- require a team id. We wouldn't want to make the team ID optional
+-- and then insert a team with no id, only to find the same team
+-- later with an id and be unable to update the record. (We could
+-- add the update logic, but it would be more trouble than it's
+-- worth.)
--
data NewsTeam =
NewsTeam { team_name :: String }
(DefaultKey NewsTeam)
--- * NewsLocation
+-- * News_Location
--- | The database type for locations as they show up in the news.
---
-data NewsLocation =
- NewsLocation {
- city :: Maybe String,
- state :: Maybe String,
- country :: String }
- deriving (Eq, Show)
-
-
--- * News_NewsLocation
-
--- | Mapping between News records and NewsLocation records in the
+-- | Mapping between 'News' records and 'Location' records in the
-- database. We don't name the fields because we don't use the names
-- explicitly; that means we have to give them nice database names
-- via groundhog.
--
-data News_NewsLocation = News_NewsLocation
- (DefaultKey News)
- (DefaultKey NewsLocation)
+data News_Location = News_Location
+ (DefaultKey News)
+ (DefaultKey Location)
-- | Define 'dbmigrate' and 'dbimport' for 'Message's. The import is
-- slightly non-generic because of our 'News_NewsTeam' and
--- 'News_NewsLocation' join tables.
+-- 'News_Location' join tables.
--
instance DbImport Message where
dbmigrate _ =
run_dbmigrate $ do
+ migrate (undefined :: Location)
migrate (undefined :: News)
migrate (undefined :: NewsTeam)
migrate (undefined :: News_NewsTeam)
- migrate (undefined :: NewsLocation)
- migrate (undefined :: News_NewsLocation)
+ migrate (undefined :: News_Location)
dbimport message = do
-- Insert the message and acquire its primary key (unique ID)
news_id <- insert_xml message
- -- And insert each one into its own table. We use insert_xml_or_select
- -- because we know that most teams will already exist, and we
- -- want to get back the id for the existing team when
- -- there's a collision.
+ -- Now insert the teams. We use insert_or_select because we know
+ -- that most teams will already exist, and we want to get back the
+ -- id for the existing team when there's a collision.
nt_ids <- mapM insert_or_select (xml_teams message)
-- Now that the teams have been inserted, create
let news_news_teams = map (News_NewsTeam news_id) nt_ids
mapM_ insert_ news_news_teams
- -- Do all of that over again for the NewsLocations.
+ -- Do all of that over again for the Locations.
loc_ids <- mapM insert_or_select (xml_locations message)
- let news_news_locations = map (News_NewsLocation news_id) loc_ids
+ let news_news_locations = map (News_Location news_id) loc_ids
mapM_ insert_ news_news_locations
return ImportSucceeded
type: constraint
fields: [team_name]
-- entity: NewsLocation
- dbName: news_locations
- constructors:
- - name: NewsLocation
- uniques:
- - name: unique_news_location
- type: constraint
- fields: [city, state, country]
-
|]
-- use our own codegen to peel those off before naming the columns.
mkPersist tsn_codegen_config [groundhog|
- entity: News
- dbName: news
constructors:
- name: News
uniques:
reference:
onDelete: cascade
-- entity: News_NewsLocation
- dbName: news__news_locations
+- entity: News_Location
+ dbName: news__locations
constructors:
- - name: News_NewsLocation
+ - name: News_Location
fields:
- - name: news_NewsLocation0 # Default created by mkNormalFieldName
+ - name: news_Location0 # Default created by mkNormalFieldName
dbName: news_id
reference:
onDelete: cascade
- - name: news_NewsLocation1 # Default created by mkNormalFieldName
- dbName: news_locations_id
+ - name: news_Location1 # Default created by mkNormalFieldName
+ dbName: locations_id
reference:
onDelete: cascade
|]
to_tuple m = (db_msg_id m, db_event_id m)
--- | Convert a 'NewsLocation' to/from XML.
---
-pickle_location :: PU NewsLocation
-pickle_location =
- xpElem "location" $
- xpWrap (from_tuple, to_tuple) $
- xpTriple (xpOption (xpElem "city" xpText))
- (xpOption (xpElem "state" xpText))
- (xpElem "country" xpText)
- where
- from_tuple =
- uncurryN NewsLocation
- to_tuple l = (city l, state l, country l)
-
-- | Convert a 'Message' to/from XML.
--
test_on_delete_cascade :: TestTree
test_on_delete_cascade = testGroup "cascading delete tests"
[ check "deleting news deletes its children"
- "test/xml/newsxml.xml" ]
+ "test/xml/newsxml.xml"
+ 4 -- 2 news_teams and 2 news_locations that should remain.
+ ]
where
- check desc path = testCase desc $ do
+ check desc path expected = testCase desc $ do
news <- unsafe_unpickle path pickle_message
- let a = undefined :: News
- let b = undefined :: NewsTeam
- let c = undefined :: News_NewsTeam
- let d = undefined :: NewsLocation
- let e = undefined :: News_NewsLocation
+ let a = undefined :: Location
+ let b = undefined :: News
+ let c = undefined :: NewsTeam
+ let d = undefined :: News_NewsTeam
+ let e = undefined :: News_Location
actual <- withSqliteConn ":memory:" $ runDbConn $ do
runMigration silentMigrationLogger $ do
migrate a
migrate d
migrate e
_ <- dbimport news
- -- No idea how 'delete' works, so do this instead.
- executeRaw False "DELETE FROM news;" []
+ deleteAll b
count_a <- countAll a
count_b <- countAll b
count_c <- countAll c
count_d <- countAll d
count_e <- countAll e
return $ count_a + count_b + count_c + count_d + count_e
- -- There are 2 news_teams and 2 news_locations that should remain.
- let expected = 4
actual @?= expected
projects / dead / htsn-import.git / blobdiff