struct JSON::Any
Overview
JSON::Any
is a convenient wrapper around all possible JSON types (JSON::Any::Type
)
and can be used for traversing dynamic or unknown JSON structures.
require "json"
obj = JSON.parse(%({"access": [{"name": "mapping", "speed": "fast"}, {"name": "any", "speed": "slow"}]}))
obj["access"][1]["name"].as_s # => "any"
obj["access"][1]["speed"].as_s # => "slow"
Note that methods used to traverse a JSON structure, #[]
and #[]?
,
always return a JSON::Any
to allow further traversal. To convert them to String
,
Int32
, etc., use the as_
methods, such as #as_s
, #as_i
, which perform
a type check against the raw underlying value. This means that invoking #as_s
when the underlying value is not a String will raise: the value won't automatically
be converted (parsed) to a String
.
Defined in:
json/any.crConstructors
-
.new(raw : Type)
Creates a
JSON::Any
that wraps the given value. -
.new(pull : JSON::PullParser)
Reads a
JSON::Any
value from the given pull parser.
Instance Method Summary
-
#==(other)
Returns
true
if the raw object is equal to other. -
#==(other : JSON::Any)
Returns
true
if bothself
and other's raw object are equal. -
#[](index : Int) : JSON::Any
Assumes the underlying value is an
Array
and returns the element at the given index. -
#[](key : String) : JSON::Any
Assumes the underlying value is a
Hash
and returns the element with the given key. -
#[]?(index : Int) : JSON::Any?
Assumes the underlying value is an
Array
and returns the element at the given index, ornil
if out of bounds. -
#[]?(key : String) : JSON::Any?
Assumes the underlying value is a
Hash
and returns the element with the given key, ornil
if the key is not present. -
#as_a : Array(Any)
Checks that the underlying value is
Array
, and returns its value. -
#as_a? : Array(Any)?
Checks that the underlying value is
Array
, and returns its value. -
#as_bool : Bool
Checks that the underlying value is
Bool
, and returns its value. -
#as_bool? : Bool?
Checks that the underlying value is
Bool
, and returns its value. - #as_f : Float64
- #as_f32 : Float32
- #as_f32? : Float32?
- #as_f? : Float64?
-
#as_h : Hash(String, Any)
Checks that the underlying value is
Hash
, and returns its value. -
#as_h? : Hash(String, Any)?
Checks that the underlying value is
Hash
, and returns its value. - #as_i : Int32
- #as_i64 : Int64
- #as_i64? : Int64?
- #as_i? : Int32?
-
#as_nil : Nil
Checks that the underlying value is
Nil
, and returnsnil
. -
#as_s : String
Checks that the underlying value is
String
, and returns its value. -
#as_s? : String?
Checks that the underlying value is
String
, and returns its value. - #clone
-
#dig(key : String | Int, *subkeys)
Traverses the depth of a structure and returns the value, otherwise raises.
-
#dig?(key : String | Int, *subkeys)
Traverses the depth of a structure and returns the value.
- #dup
- #hash(hasher)
-
#raw : Type
Returns the raw underlying value.
- #size : Int
- #to_yaml(yaml : YAML::Nodes::Builder)
Instance methods inherited from struct Struct
==(other) : Bool
==,
hash(hasher)
hash,
inspect(io : IO) : Nil
inspect,
pretty_print(pp) : Nil
pretty_print,
to_s(io : IO) : Nil
to_s
Instance methods inherited from struct Value
==(other : JSON::Any)==(other : YAML::Any)
==(other) ==, dup dup
Instance methods inherited from class Object
! : Bool
!,
!=(other)
!=,
!~(other)
!~,
==(other)
==,
===(other : JSON::Any)===(other : YAML::Any)
===(other) ===, =~(other) =~, as(type : Class) as, as?(type : Class) as?, class class, dup dup, hash
hash(hasher) hash, inspect(io : IO) : Nil
inspect : String inspect, is_a?(type : Class) : Bool is_a?, itself itself, nil? : Bool nil?, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, responds_to?(name : Symbol) : Bool responds_to?, tap(&) tap, to_json(io : IO)
to_json to_json, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ") to_pretty_json, to_s : String
to_s(io : IO) : Nil to_s, to_yaml(io : IO)
to_yaml to_yaml, try(&) try, unsafe_as(type : T.class) forall T unsafe_as
Class methods inherited from class Object
from_json(string_or_io, root : String)from_json(string_or_io) from_json, from_yaml(string_or_io : String | IO) from_yaml
Constructor Detail
Instance Method Detail
Returns true
if both self
and other's raw object are equal.
Assumes the underlying value is an Array
and returns the element
at the given index.
Raises if the underlying value is not an Array
.
Assumes the underlying value is a Hash
and returns the element
with the given key.
Raises if the underlying value is not a Hash
.
Assumes the underlying value is an Array
and returns the element
at the given index, or nil
if out of bounds.
Raises if the underlying value is not an Array
.
Assumes the underlying value is a Hash
and returns the element
with the given key, or nil
if the key is not present.
Raises if the underlying value is not a Hash
.
Checks that the underlying value is Array
, and returns its value.
Raises otherwise.
Checks that the underlying value is Array
, and returns its value.
Returns nil
otherwise.
Checks that the underlying value is Bool
, and returns its value.
Raises otherwise.
Checks that the underlying value is Bool
, and returns its value.
Returns nil
otherwise.
Checks that the underlying value is Float
, and returns its value as an Float32
.
Returns nil
otherwise.
Checks that the underlying value is Float
, and returns its value as an Float64
.
Returns nil
otherwise.
Checks that the underlying value is Hash
, and returns its value.
Raises otherwise.
Checks that the underlying value is Hash
, and returns its value.
Returns nil
otherwise.
Checks that the underlying value is Nil
, and returns nil
.
Raises otherwise.
Checks that the underlying value is String
, and returns its value.
Raises otherwise.
Checks that the underlying value is String
, and returns its value.
Returns nil
otherwise.
Traverses the depth of a structure and returns the value, otherwise raises.
Traverses the depth of a structure and returns the value.
Returns nil
if not found.