default values for PersistList on SQLite - YesodComparing Haskell's Snap and Yesod web frameworksExceptions in YesodMongoDB Example for Yesod / Persistentyesod persistent: get Entity value within hamletYesod migrating custom data typesPersistMap in Yesod?Yesod Persistent: SQLite table with id row onlyError with Persistent syntax using MySQL and YesodYesod CSS luciusYesod: Passing the current user to a form
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default values for PersistList on SQLite - Yesod
Comparing Haskell's Snap and Yesod web frameworksExceptions in YesodMongoDB Example for Yesod / Persistentyesod persistent: get Entity value within hamletYesod migrating custom data typesPersistMap in Yesod?Yesod Persistent: SQLite table with id row onlyError with Persistent syntax using MySQL and YesodYesod CSS luciusYesod: Passing the current user to a form
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
I would like to add a PersistList value into a user entity with a default value. My model file looks like this. And Models.hs file:
User
ident Text
password Text Maybe
UniqueUser ident
perms [Privileges] default=[PrvDemoOne]
deriving Typeable
data Privileges =
PrvDemoOne -- ^ what can be demo one...
| PrvDemoTwo -- ^ what can be demo two...
deriving (Show,Read,Eq)
derivePersistField "Privileges"
the code compiles but when a new user is added into the table save an empty array instead of an array with the default value.
1|google-uid:223344555661778819911||[]
The question is how I could save the column with the default value?
haskell yesod persistent
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
add a comment |
I would like to add a PersistList value into a user entity with a default value. My model file looks like this. And Models.hs file:
User
ident Text
password Text Maybe
UniqueUser ident
perms [Privileges] default=[PrvDemoOne]
deriving Typeable
data Privileges =
PrvDemoOne -- ^ what can be demo one...
| PrvDemoTwo -- ^ what can be demo two...
deriving (Show,Read,Eq)
derivePersistField "Privileges"
the code compiles but when a new user is added into the table save an empty array instead of an array with the default value.
1|google-uid:223344555661778819911||[]
The question is how I could save the column with the default value?
haskell yesod persistent
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
add a comment |
I would like to add a PersistList value into a user entity with a default value. My model file looks like this. And Models.hs file:
User
ident Text
password Text Maybe
UniqueUser ident
perms [Privileges] default=[PrvDemoOne]
deriving Typeable
data Privileges =
PrvDemoOne -- ^ what can be demo one...
| PrvDemoTwo -- ^ what can be demo two...
deriving (Show,Read,Eq)
derivePersistField "Privileges"
the code compiles but when a new user is added into the table save an empty array instead of an array with the default value.
1|google-uid:223344555661778819911||[]
The question is how I could save the column with the default value?
haskell yesod persistent
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
I would like to add a PersistList value into a user entity with a default value. My model file looks like this. And Models.hs file:
User
ident Text
password Text Maybe
UniqueUser ident
perms [Privileges] default=[PrvDemoOne]
deriving Typeable
data Privileges =
PrvDemoOne -- ^ what can be demo one...
| PrvDemoTwo -- ^ what can be demo two...
deriving (Show,Read,Eq)
derivePersistField "Privileges"
the code compiles but when a new user is added into the table save an empty array instead of an array with the default value.
1|google-uid:223344555661778819911||[]
The question is how I could save the column with the default value?
haskell yesod persistent
haskell yesod persistent
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
edited May 5 at 9:49
recnac
3,1976 gold badges9 silver badges38 bronze badges
3,1976 gold badges9 silver badges38 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
asked Mar 27 at 15:25
oriajoriaj
4138 silver badges26 bronze badges
4138 silver badges26 bronze badges
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
Have you read this? The value of the default field doesn't really have anything to do with the Haskell side per-se, it's being passed to set the "default value" description your DBMS. In this case [PrvDemoOne] is being passed directly to SQLite, which will interpret it as gibberish (because it's not a valid SQL expression) so this is either ignored or (what seems to be the case here) treated as if you hadn't set a default at all.
If you want a "Haskell side" default value you should just create a function for that, i.e. something like
defaultUser :: Text -> Maybe Text -> User
defaultUser i maybePw = User ident = i, password = maybePw, perms = [PrvDemoOne]
If you want a SQL side default you need to write the corresponding SQL expression for the value you're trying to represent.
On a non-Haskell related note: the 'normal' way to represent lists (or sets in this case, rather!) in SQL is via relations, so you'd normally have a many-to-many relationship mapping users to their privileges instead of a list field.
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
add a comment |
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1 Answer
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1 Answer
1
active
oldest
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active
oldest
votes
Have you read this? The value of the default field doesn't really have anything to do with the Haskell side per-se, it's being passed to set the "default value" description your DBMS. In this case [PrvDemoOne] is being passed directly to SQLite, which will interpret it as gibberish (because it's not a valid SQL expression) so this is either ignored or (what seems to be the case here) treated as if you hadn't set a default at all.
If you want a "Haskell side" default value you should just create a function for that, i.e. something like
defaultUser :: Text -> Maybe Text -> User
defaultUser i maybePw = User ident = i, password = maybePw, perms = [PrvDemoOne]
If you want a SQL side default you need to write the corresponding SQL expression for the value you're trying to represent.
On a non-Haskell related note: the 'normal' way to represent lists (or sets in this case, rather!) in SQL is via relations, so you'd normally have a many-to-many relationship mapping users to their privileges instead of a list field.
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
add a comment |
Have you read this? The value of the default field doesn't really have anything to do with the Haskell side per-se, it's being passed to set the "default value" description your DBMS. In this case [PrvDemoOne] is being passed directly to SQLite, which will interpret it as gibberish (because it's not a valid SQL expression) so this is either ignored or (what seems to be the case here) treated as if you hadn't set a default at all.
If you want a "Haskell side" default value you should just create a function for that, i.e. something like
defaultUser :: Text -> Maybe Text -> User
defaultUser i maybePw = User ident = i, password = maybePw, perms = [PrvDemoOne]
If you want a SQL side default you need to write the corresponding SQL expression for the value you're trying to represent.
On a non-Haskell related note: the 'normal' way to represent lists (or sets in this case, rather!) in SQL is via relations, so you'd normally have a many-to-many relationship mapping users to their privileges instead of a list field.
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
add a comment |
Have you read this? The value of the default field doesn't really have anything to do with the Haskell side per-se, it's being passed to set the "default value" description your DBMS. In this case [PrvDemoOne] is being passed directly to SQLite, which will interpret it as gibberish (because it's not a valid SQL expression) so this is either ignored or (what seems to be the case here) treated as if you hadn't set a default at all.
If you want a "Haskell side" default value you should just create a function for that, i.e. something like
defaultUser :: Text -> Maybe Text -> User
defaultUser i maybePw = User ident = i, password = maybePw, perms = [PrvDemoOne]
If you want a SQL side default you need to write the corresponding SQL expression for the value you're trying to represent.
On a non-Haskell related note: the 'normal' way to represent lists (or sets in this case, rather!) in SQL is via relations, so you'd normally have a many-to-many relationship mapping users to their privileges instead of a list field.
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
Have you read this? The value of the default field doesn't really have anything to do with the Haskell side per-se, it's being passed to set the "default value" description your DBMS. In this case [PrvDemoOne] is being passed directly to SQLite, which will interpret it as gibberish (because it's not a valid SQL expression) so this is either ignored or (what seems to be the case here) treated as if you hadn't set a default at all.
If you want a "Haskell side" default value you should just create a function for that, i.e. something like
defaultUser :: Text -> Maybe Text -> User
defaultUser i maybePw = User ident = i, password = maybePw, perms = [PrvDemoOne]
If you want a SQL side default you need to write the corresponding SQL expression for the value you're trying to represent.
On a non-Haskell related note: the 'normal' way to represent lists (or sets in this case, rather!) in SQL is via relations, so you'd normally have a many-to-many relationship mapping users to their privileges instead of a list field.
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
answered Mar 27 at 16:07
CubicCubic
11.7k3 gold badges34 silver badges76 bronze badges
11.7k3 gold badges34 silver badges76 bronze badges
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