struct JSON::Any

Overview

JSON::Any is a convenient wrapper around all possible JSON types (JSON::Type) and can be used for traversing dynamic or unknown JSON structures.

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 #each, 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.

Included Modules

Defined in:

json/any.cr

Constructors

Instance Method Summary

Instance methods inherited from module Enumerable(self)

all?(&block)
all?
all?
, any?(&block)
any?
any?
, chunks(&block : T -> U) forall U chunks, compact_map(&block) compact_map, count(&block)
count(item)
count
, cycle(n, &block)
cycle(&block)
cycle
, each(&block : T -> _) each, each_cons(count : Int, reuse = false, &block) each_cons, each_slice(count : Int, reuse = false, &block) each_slice, each_with_index(offset = 0, &block) each_with_index, each_with_object(obj, &block) each_with_object, find(if_none = nil, &block) find, first(count : Int)
first
first
, first? first?, flat_map(&block : T -> Array(U) | Iterator(U) | U) forall U flat_map, grep(pattern) grep, group_by(&block : T -> U) forall U group_by, in_groups_of(size : Int, filled_up_with : U = nil) forall U
in_groups_of(size : Int, filled_up_with : U = nil, reuse = false, &block) forall U
in_groups_of
, includes?(obj) includes?, index(&block)
index(obj)
index
, index_by(&block : T -> U) forall U index_by, join(separator, io)
join(separator = "")
join(separator, io, &block)
join(separator = "", &block)
join
, map(&block : T -> U) forall U map, map_with_index(&block : T, Int32 -> U) forall U map_with_index, max max, max? max?, max_by(&block : T -> U) forall U max_by, max_by?(&block : T -> U) forall U max_by?, max_of(&block : T -> U) forall U max_of, max_of?(&block : T -> U) forall U max_of?, min min, min? min?, min_by(&block : T -> U) forall U min_by, min_by?(&block : T -> U) forall U min_by?, min_of(&block : T -> U) forall U min_of, min_of?(&block : T -> U) forall U min_of?, minmax minmax, minmax? minmax?, minmax_by(&block : T -> U) forall U minmax_by, minmax_by?(&block : T -> U) forall U minmax_by?, minmax_of(&block : T -> U) forall U minmax_of, minmax_of?(&block : T -> U) forall U minmax_of?, none?(&block)
none?
none?
, one?(&block) one?, partition(&block) partition, product(&block)
product(initial : Number, &block)
product
product(initial : Number)
product
, reduce(&block)
reduce(memo, &block)
reduce
, reject(&block : T -> ) reject, select(&block : T -> ) select, size size, skip(count : Int) skip, skip_while(&block) skip_while, sum(initial)
sum
sum(initial, &block)
sum(&block)
sum
, take_while(&block) take_while, to_a to_a, to_h to_h, to_set to_set

Instance methods inherited from struct Struct

==(other : self) : Bool ==, hash : Int32 hash, inspect(io : IO) : Nil inspect, pretty_print(pp) : Nil pretty_print, to_s(io) to_s

Instance methods inherited from struct Value

==(other) ==, dup dup

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
===(other)
===
, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
inspect
inspect
, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) 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
to_s(io : IO)
to_s
, to_yaml(io : IO)
to_yaml
to_yaml
, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self
from_json
, from_yaml(string_or_io) : self from_yaml

Constructor Detail

def self.new(raw : JSON::Type) #

Creates a JSON::Any that wraps the given JSON::Type.


[View source]
def self.new(pull : JSON::PullParser) #

Reads a JSON::Any value from the given pull parser.


[View source]

Instance Method Detail

def ==(other) #

Returns true if the raw object is equal to other.


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def ==(other : JSON::Any) #

Returns true if both self and other's raw object are equal.


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def [](index : Int) : JSON::Any #

Assumes the underlying value is an Array and returns the element at the given index. Raises if the underlying value is not an Array.


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def [](key : String) : JSON::Any #

Assumes the underlying value is a Hash and returns the element with the given key. Raises if the underlying value is not a Hash.


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def []?(index : Int) : JSON::Any? #

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.


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def []?(key : String) : JSON::Any? #

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.


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def as_a : Array(Type) #

Checks that the underlying value is Array, and returns its value. Raises otherwise.


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def as_a? : Array(Type)? #

Checks that the underlying value is Array, and returns its value. Returns nil otherwise.


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def as_bool : Bool #

Checks that the underlying value is Bool, and returns its value. Raises otherwise.


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def as_bool? : Bool? #

Checks that the underlying value is Bool, and returns its value. Returns nil otherwise.


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def as_f : Float64 #

Checks that the underlying value is Float, and returns its value as an Float64. Raises otherwise.


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def as_f32 : Float32 #

Checks that the underlying value is Float, and returns its value as an Float32. Raises otherwise.


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def as_f32? : Float32? #

Checks that the underlying value is Float, and returns its value as an Float32. Returns nil otherwise.


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def as_f? : Float64? #

Checks that the underlying value is Float, and returns its value as an Float64. Returns nil otherwise.


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def as_h : Hash(String, Type) #

Checks that the underlying value is Hash, and returns its value. Raises otherwise.


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def as_h? : Hash(String, Type)? #

Checks that the underlying value is Hash, and returns its value. Returns nil otherwise.


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def as_i : Int32 #

Checks that the underlying value is Int, and returns its value as an Int32. Raises otherwise.


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def as_i64 : Int64 #

Checks that the underlying value is Int, and returns its value as an Int64. Raises otherwise.


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def as_i64? : Int64? #

Checks that the underlying value is Int, and returns its value as an Int64. Returns nil otherwise.


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def as_i? : Int32? #

Checks that the underlying value is Int, and returns its value as an Int32. Returns nil otherwise.


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def as_nil : Nil #

Checks that the underlying value is Nil, and returns nil. Raises otherwise.


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def as_s : String #

Checks that the underlying value is String, and returns its value. Raises otherwise.


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def as_s? : String? #

Checks that the underlying value is String, and returns its value. Returns nil otherwise.


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def each(&block) #

Assumes the underlying value is an Array or Hash and yields each of the elements or key/values, always as JSON::Any. Raises if the underlying value is not an Array or Hash.


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def raw : JSON::Type #

Returns the raw underlying value, a JSON::Type.


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def size : Int #

Assumes the underlying value is an Array or Hash and returns its size. Raises if the underlying value is not an Array or Hash.


[View source]