| Safe Haskell | None |
|---|---|
| Language | Haskell98 |
Yesod.Persist.Core
Description
Defines the core functionality of this package. This package is distinguished from Yesod.Persist in that the latter additionally exports the persistent modules themselves.
Synopsis
- class Monad (YesodDB site) => YesodPersist site where
- type YesodPersistBackend site
- defaultRunDB :: PersistConfig c => (site -> c) -> (site -> PersistConfigPool c) -> PersistConfigBackend c (HandlerFor site) a -> HandlerFor site a
- class YesodPersist site => YesodPersistRunner site where
- defaultGetDBRunner :: (IsSqlBackend backend, YesodPersistBackend site ~ backend) => (site -> Pool backend) -> HandlerFor site (DBRunner site, HandlerFor site ())
- newtype DBRunner site = DBRunner {
- runDBRunner :: forall a. YesodDB site a -> HandlerFor site a
- runDBSource :: YesodPersistRunner site => ConduitT () a (YesodDB site) () -> ConduitT () a (HandlerFor site) ()
- respondSourceDB :: YesodPersistRunner site => ContentType -> ConduitT () (Flush Builder) (YesodDB site) () -> HandlerFor site TypedContent
- type YesodDB site = ReaderT (YesodPersistBackend site) (HandlerFor site)
- get404 :: (MonadIO m, PersistStoreRead backend, PersistRecordBackend val backend) => Key val -> ReaderT backend m val
- getBy404 :: (PersistUniqueRead backend, PersistRecordBackend val backend, MonadIO m) => Unique val -> ReaderT backend m (Entity val)
- insert400 :: (MonadIO m, PersistUniqueWrite backend, PersistRecordBackend val backend) => val -> ReaderT backend m (Key val)
- insert400_ :: (MonadIO m, PersistUniqueWrite backend, PersistRecordBackend val backend) => val -> ReaderT backend m ()
Documentation
class Monad (YesodDB site) => YesodPersist site where Source #
Minimal complete definition
Associated Types
type YesodPersistBackend site Source #
Methods
runDB :: YesodDB site a -> HandlerFor site a Source #
defaultRunDB :: PersistConfig c => (site -> c) -> (site -> PersistConfigPool c) -> PersistConfigBackend c (HandlerFor site) a -> HandlerFor site a Source #
Helper for creating runDB.
Since 1.2.0
class YesodPersist site => YesodPersistRunner site where Source #
Since 1.2.0
Minimal complete definition
Methods
getDBRunner :: HandlerFor site (DBRunner site, HandlerFor site ()) Source #
This function differs from runDB in that it returns a database
runner function, as opposed to simply running a single action. This will
usually mean that a connection is taken from a pool and then reused for
each invocation. This can be useful for creating streaming responses;
see runDBSource.
It additionally returns a cleanup function to free the connection. If your code finishes successfully, you must call this cleanup to indicate changes should be committed. Otherwise, for SQL backends at least, a rollback will be used instead.
Since 1.2.0
defaultGetDBRunner :: (IsSqlBackend backend, YesodPersistBackend site ~ backend) => (site -> Pool backend) -> HandlerFor site (DBRunner site, HandlerFor site ()) Source #
Helper for implementing getDBRunner.
Since 1.2.0
newtype DBRunner site Source #
Constructors
| DBRunner | |
Fields
| |
runDBSource :: YesodPersistRunner site => ConduitT () a (YesodDB site) () -> ConduitT () a (HandlerFor site) () Source #
Like runDB, but transforms a Source. See respondSourceDB for an
example, practical use case.
Since 1.2.0
respondSourceDB :: YesodPersistRunner site => ContentType -> ConduitT () (Flush Builder) (YesodDB site) () -> HandlerFor site TypedContent Source #
Extends respondSource to create a streaming database response body.
type YesodDB site = ReaderT (YesodPersistBackend site) (HandlerFor site) Source #
get404 :: (MonadIO m, PersistStoreRead backend, PersistRecordBackend val backend) => Key val -> ReaderT backend m val Source #
Get the given entity by ID, or return a 404 not found if it doesn't exist.
getBy404 :: (PersistUniqueRead backend, PersistRecordBackend val backend, MonadIO m) => Unique val -> ReaderT backend m (Entity val) Source #
Get the given entity by unique key, or return a 404 not found if it doesn't exist.
insert400 :: (MonadIO m, PersistUniqueWrite backend, PersistRecordBackend val backend) => val -> ReaderT backend m (Key val) Source #
Create a new record in the database, returning an automatically created key, or raise a 400 bad request if a uniqueness constraint is violated.
Since: yesod-persistent-1.4.1