Class: Parametric::Field

Inherits:
Object
  • Object
show all
Includes:
FieldDSL
Defined in:
lib/parametric/field.rb

Defined Under Namespace

Classes: Result

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from FieldDSL

#declared, #options, #present, #required

Constructor Details

#initialize(key, registry = Parametric.registry) ⇒ Field

Returns a new instance of Field.



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# File 'lib/parametric/field.rb', line 12

def initialize(key, registry = Parametric.registry)
  @key = key
  @policies = []
  @registry = registry
  @default_block = nil
  @meta_data = {}
  @policies = []
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/parametric/field.rb', line 9

def key
  @key
end

#meta_data ⇒ Object (readonly)

Returns the value of attribute meta_data.



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# File 'lib/parametric/field.rb', line 9

def meta_data
  @meta_data
end

Instance Method Details

#default(value) ⇒ Object 



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# File 'lib/parametric/field.rb', line 26

def default(value)
  meta default: value
  @default_block = (value.respond_to?(:call) ? value : ->(key, payload, context) { value })
  self
end

#meta(hash = nil) ⇒ Object 



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# File 'lib/parametric/field.rb', line 21

def meta(hash = nil)
  @meta_data = @meta_data.merge(hash) if hash.is_a?(Hash)
  self
end

#policy(key, *args) ⇒ Object Also known as: type 



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# File 'lib/parametric/field.rb', line 32

def policy(key, *args)
  pol = lookup(key, args)
  meta pol.meta_data
  policies << pol
  self
end

#resolve(payload, context) ⇒ Object 



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# File 'lib/parametric/field.rb', line 55

def resolve(payload, context)
  eligible = payload.key?(key)
  value = payload[key] # might be nil

  if !eligible && has_default?
    eligible = true
    value = default_block.call(key, payload, context)
    return Result.new(eligible, value)
  end

  policies.each do |policy|
    if !policy.eligible?(value, key, payload)
      eligible = false
      if has_default?
        eligible = true
        value = default_block.call(key, payload, context)
      end
      break
    else
      value = resolve_one(policy, value, context)
      if !policy.valid?(value, key, payload)
        eligible = true # eligible, but has errors
        context.add_error policy.message
        break # only one error at a time
      end
    end
  end

  Result.new(eligible, value)
end

#schema(sc = nil, &block) ⇒ Object 



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# File 'lib/parametric/field.rb', line 40

def schema(sc = nil, &block)
  sc = (sc ? sc : Schema.new(&block))
  meta schema: sc
  policy sc
end

#visit(meta_key = nil, &visitor) ⇒ Object 



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# File 'lib/parametric/field.rb', line 46

def visit(meta_key = nil, &visitor)
  if sc = meta_data[:schema]
    r = sc.visit(meta_key, &visitor)
    (meta_data[:type] == :array) ? [r] : r
  else
    meta_key ? meta_data[meta_key] : yield(self)
  end
end