Class: Trailblazer::Declarative::State

Inherits:
Object
  • Object
show all
Defined in:
lib/trailblazer/declarative/state.rb

Overview

FIXME: who is providing the immutable API?

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ State

Returns a new instance of State.



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# File 'lib/trailblazer/declarative/state.rb', line 19

def initialize
  @fields        = {}
  @field_options = {}
end

Class Method Details

.dup(value) ⇒ Object

DISCUSS: should that be here?



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# File 'lib/trailblazer/declarative/state.rb', line 11

def self.dup(value, **) # DISCUSS: should that be here?
  value.dup
end

.subclass(value) ⇒ Object 



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# File 'lib/trailblazer/declarative/state.rb', line 15

def self.subclass(value, **)
  Class.new(value)
end

Instance Method Details

#add!(path, value, copy: State.method(:dup)) ⇒ Object 



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# File 'lib/trailblazer/declarative/state.rb', line 24

def add!(path, value, copy: State.method(:dup))
  @fields[path]        = value
  @field_options[path] = {copy: copy}
  self
end

#copy(**options) ⇒ Object

DISCUSS: do we need it?



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# File 'lib/trailblazer/declarative/state.rb', line 58

def copy(**options) # DISCUSS: make class method?
  inherited_fields = copy_fields(**options)

  Declarative.State(inherited_fields)
end

#copy_fields(**options) ⇒ Object 



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# File 'lib/trailblazer/declarative/state.rb', line 48

def copy_fields(**options)
  @fields.collect do |path, value|
    path_options = @field_options.fetch(path)
    inherited_value = path_options.fetch(:copy).(value, **options)

    [path, [inherited_value, path_options]]
  end.to_h
end

#get(path) ⇒ Object 



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# File 'lib/trailblazer/declarative/state.rb', line 39

def get(path)
  @fields.fetch(path)
end

#set!(path, value) ⇒ Object 



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# File 'lib/trailblazer/declarative/state.rb', line 44

def set!(path, value)
  @fields[path] = value
end

#update!(path, &block) ⇒ Object

Tries to retrieve path, if it exists block is called and receives the old value. The return value of the block will be the new value.



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# File 'lib/trailblazer/declarative/state.rb', line 33

def update!(path, &block)
  value = get(path)
  new_value = yield(value, **{})
  set!(path, new_value)
end