Class: Dry::Schema::KeyMap

Inherits:
Object
  • Object
show all
Extended by:
Core::Cache
Includes:
Enumerable
Defined in:
lib/dry/schema/key_map.rb

Overview

Represents a list of keys defined by the DSL

KeyMap objects expose an API for introspecting schema keys and the ability to rebuild an input hash using configured coercer function.

Instances of this class are used as the very first step by the schema processors.

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(keys) ⇒ KeyMap

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Set key objects



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# File 'lib/dry/schema/key_map.rb', line 52

def initialize(keys)
  @keys = keys.map { |key|
    case key
    when Hash
      root, rest = key.flatten
      Key::Hash[root, members: KeyMap[*rest]]
    when Array
      root, rest = key
      Key::Array[root, member: KeyMap[*rest]]
    when Key
      key
    else
      Key[key]
    end
  }
end

Instance Attribute Details

#keys ⇒ Object (readonly)

@!attribute keys

@return [Array<Key>] A list of defined key objects



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# File 'lib/dry/schema/key_map.rb', line 24

def keys
  @keys
end

Class Method Details

.[](*keys) ⇒ KeyMap

Coerce a list of key specs into a key map

Examples:

KeyMap[:id, :name]
KeyMap[:title, :artist, tags: [:name]]
KeyMap[:title, :artist, [:tags]]


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# File 'lib/dry/schema/key_map.rb', line 36

def self.[](*keys)
  new(keys)
end

.new(*args) ⇒ KeyMap

Build new, or returned a cached instance of a key map



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# File 'lib/dry/schema/key_map.rb', line 45

def self.new(*args)
  fetch_or_store(*args) { super }
end

Instance Method Details

#+(other) ⇒ KeyMap

Return a new key map merged with the provided one



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# File 'lib/dry/schema/key_map.rb', line 114

def +(other)
  self.class.new(keys + other.to_a)
end

#coercible(&coercer) ⇒ KeyMap

Return a new key map that is configured to coerce keys using provided coercer function



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# File 'lib/dry/schema/key_map.rb', line 87

def coercible(&coercer)
  self.class.new(map { |key| key.coercible(&coercer) })
end

#dump ⇒ Array

Dump keys to their spec format



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# File 'lib/dry/schema/key_map.rb', line 128

def dump
  keys.map(&:dump)
end

#each(&block) ⇒ Object

Iterate over keys



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# File 'lib/dry/schema/key_map.rb', line 105

def each(&block)
  keys.each(&block)
end

#inspect ⇒ String

Return a string representation of a key map



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# File 'lib/dry/schema/key_map.rb', line 121

def inspect
  "#<#{self.class}[#{keys.map(&:dump).map(&:inspect).join(", ")}]>"
end

#stringified ⇒ KeyMap

Return a new key map with stringified keys

A stringified key map is suitable for reading hashes with string keys



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# File 'lib/dry/schema/key_map.rb', line 98

def stringified
  self.class.new(map(&:stringified))
end

#write(source, target = EMPTY_HASH.dup) ⇒ Hash

Write a new hash based on the source hash



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# File 'lib/dry/schema/key_map.rb', line 77

def write(source, target = EMPTY_HASH.dup)
  each { |key| key.write(source, target) }
  target
end