[英]How to turn a TaskOption into a TaskEither using fp-ts?
I have a function that can be used to find an object in the database and returns a TaskOption
:我有一个函数可用于在数据库中查找对象并返回一个
TaskOption
:
find: (key: SchemaInfo) => TO.TaskOption<Schema>
and another one that saves it:另一个保存它:
register: (schema: Schema) => TE.TaskEither<Error, void>
In my register
implementation I'd like to check whether the Schema
I'm trying to save exists or not (I want to use find
), but I don't know how to map a TaskOption
into a TaskEither
.在我的
register
实现中,我想检查我尝试保存的Schema
是否存在(我想使用find
),但我不知道如何将TaskOption
映射到TaskEither
。 I tried to do this:我试图这样做:
pipe(
findSchema(schema.info),
TE.fromTaskOption,
TE.swap
)
but TE.fromTaskOption
doesn't return the TaskEither
I expect.但
TE.fromTaskOption
没有返回我期望的TaskEither
。 I also tried TE.fromTaskOptionK
but it didn't work either, it returns a weird shaped function instead.我也试过
TE.fromTaskOptionK
但它也不起作用,它返回一个奇怪的形状函数。
My use case is that in case the TaskOption
is none
I try saving (this means that the schema is not registered yet) otherwise I return an error (the schema is already registered).我的用例是,如果
TaskOption
为none
我会尝试保存(这意味着架构尚未注册),否则我将返回错误(架构已注册)。 How can I solve this?我该如何解决这个问题?
TE.fromTaskOption
requires a value to put into Left
, when the TO is None
当 TO 为
None
时, TE.fromTaskOption
需要一个值放入Left
Try this:尝试这个:
pipe(
findSchema(schema.info),
TE.fromTaskOption(() => "No schema"),
TE.swap
)
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