Scala circe decode Map[String, String] type
I have a Map[String, String] object with I want to use as json. I have written an encoder for this type:
implicit val encodeMap: Encoder[Map[String, String]] = new Encoder[Map[String, String]]
override def apply(values: Map[String, String]): Json =
values.toList
.map(pair => Json.obj(
(pair._1, pair._2.asJson)
)).asJson
In addition to encoder, I need a decoder, but I don't have an idea how to write it. My best try so far:
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
final def apply(c: HCurser): Decoder.Result[Map[String, String]] = ???
Pretty basic, but I don't really know how to get into this problem.
Thanks!
scala circe
asked Oct 10 '18 at 19:02
Doe
62
add a comment |
I have a Map[String, String] object with I want to use as json. I have written an encoder for this type:
implicit val encodeMap: Encoder[Map[String, String]] = new Encoder[Map[String, String]]
override def apply(values: Map[String, String]): Json =
values.toList
.map(pair => Json.obj(
(pair._1, pair._2.asJson)
)).asJson
In addition to encoder, I need a decoder, but I don't have an idea how to write it. My best try so far:
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
final def apply(c: HCurser): Decoder.Result[Map[String, String]] = ???
Pretty basic, but I don't really know how to get into this problem.
Thanks!
scala circe
asked Oct 10 '18 at 19:02
Doe
62
Doesimport io.circe.generic.auto._not just work here (allowing you to use.asJson) ?
– Andy Hayden
Oct 10 '18 at 19:28
add a comment |
I have a Map[String, String] object with I want to use as json. I have written an encoder for this type:
implicit val encodeMap: Encoder[Map[String, String]] = new Encoder[Map[String, String]]
override def apply(values: Map[String, String]): Json =
values.toList
.map(pair => Json.obj(
(pair._1, pair._2.asJson)
)).asJson
In addition to encoder, I need a decoder, but I don't have an idea how to write it. My best try so far:
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
final def apply(c: HCurser): Decoder.Result[Map[String, String]] = ???
Pretty basic, but I don't really know how to get into this problem.
Thanks!
scala circe
asked Oct 10 '18 at 19:02
Doe
62
I have a Map[String, String] object with I want to use as json. I have written an encoder for this type:
implicit val encodeMap: Encoder[Map[String, String]] = new Encoder[Map[String, String]]
override def apply(values: Map[String, String]): Json =
values.toList
.map(pair => Json.obj(
(pair._1, pair._2.asJson)
)).asJson
In addition to encoder, I need a decoder, but I don't have an idea how to write it. My best try so far:
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
final def apply(c: HCurser): Decoder.Result[Map[String, String]] = ???
Pretty basic, but I don't really know how to get into this problem.
Thanks!
scala circe
scala circe
asked Oct 10 '18 at 19:02
Doe
62
asked Oct 10 '18 at 19:02
Doe
62
edited Oct 10 '18 at 20:00
asked Oct 10 '18 at 19:02
Doe
62
asked Oct 10 '18 at 19:02
Doe
62
asked Oct 10 '18 at 19:02
Doe
62
62
Doesimport io.circe.generic.auto._not just work here (allowing you to use.asJson) ?
– Andy Hayden
Oct 10 '18 at 19:28
add a comment |
Doesimport io.circe.generic.auto._not just work here (allowing you to use.asJson) ?
– Andy Hayden
Oct 10 '18 at 19:28
Does
import io.circe.generic.auto._ not just work here (allowing you to use .asJson) ?– Andy Hayden
Oct 10 '18 at 19:28
Does
import io.circe.generic.auto._ not just work here (allowing you to use .asJson) ?– Andy Hayden
Oct 10 '18 at 19:28
add a comment |
1 Answer
1
active
oldest
votes
Something like this should work but as Andy said above, you should be able to use automatic or semi-automatic derivation in this case.
import cats.syntax.either._
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
override def apply(c: HCursor): Decoder.Result[Map[String, String]] =
c.keys.fold[Decoder.Result[Map[String, String]]](Right(Map.empty))(
_.foldLeft(Map[String, String]().asRight[DecodingFailure])((res, k) =>
res.flatMap((m: Map[String, String]) =>
c.downField(k).as[String].fold(
_.asLeft[Map[String, String]],
v => (m + (k -> v)).asRight[DecodingFailure]
)
)
)
)
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Something like this should work but as Andy said above, you should be able to use automatic or semi-automatic derivation in this case.
import cats.syntax.either._
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
override def apply(c: HCursor): Decoder.Result[Map[String, String]] =
c.keys.fold[Decoder.Result[Map[String, String]]](Right(Map.empty))(
_.foldLeft(Map[String, String]().asRight[DecodingFailure])((res, k) =>
res.flatMap((m: Map[String, String]) =>
c.downField(k).as[String].fold(
_.asLeft[Map[String, String]],
v => (m + (k -> v)).asRight[DecodingFailure]
)
)
)
)
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
add a comment |
Something like this should work but as Andy said above, you should be able to use automatic or semi-automatic derivation in this case.
import cats.syntax.either._
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
override def apply(c: HCursor): Decoder.Result[Map[String, String]] =
c.keys.fold[Decoder.Result[Map[String, String]]](Right(Map.empty))(
_.foldLeft(Map[String, String]().asRight[DecodingFailure])((res, k) =>
res.flatMap((m: Map[String, String]) =>
c.downField(k).as[String].fold(
_.asLeft[Map[String, String]],
v => (m + (k -> v)).asRight[DecodingFailure]
)
)
)
)
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
add a comment |
Something like this should work but as Andy said above, you should be able to use automatic or semi-automatic derivation in this case.
import cats.syntax.either._
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
override def apply(c: HCursor): Decoder.Result[Map[String, String]] =
c.keys.fold[Decoder.Result[Map[String, String]]](Right(Map.empty))(
_.foldLeft(Map[String, String]().asRight[DecodingFailure])((res, k) =>
res.flatMap((m: Map[String, String]) =>
c.downField(k).as[String].fold(
_.asLeft[Map[String, String]],
v => (m + (k -> v)).asRight[DecodingFailure]
)
)
)
)
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
Something like this should work but as Andy said above, you should be able to use automatic or semi-automatic derivation in this case.
import cats.syntax.either._
implicit val decodeMap: Decoder[Map[String, String]] = new Decoder[Map[String, String]]
override def apply(c: HCursor): Decoder.Result[Map[String, String]] =
c.keys.fold[Decoder.Result[Map[String, String]]](Right(Map.empty))(
_.foldLeft(Map[String, String]().asRight[DecodingFailure])((res, k) =>
res.flatMap((m: Map[String, String]) =>
c.downField(k).as[String].fold(
_.asLeft[Map[String, String]],
v => (m + (k -> v)).asRight[DecodingFailure]
)
)
)
)
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
edited Nov 12 '18 at 19:24
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
answered Nov 12 '18 at 19:16
Paul Medcraft
1,1461023
1,1461023
add a comment |
add a comment |
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Does
import io.circe.generic.auto._not just work here (allowing you to use.asJson) ?– Andy Hayden
Oct 10 '18 at 19:28