Class: TypedEAV::FieldStorageContract

Inherits:
Object
  • Object
show all
Defined in:
lib/typed_eav/field_storage_contract.rb

Overview

One field-owned seam for native typed-column storage behavior.

The contract intentionally delegates to the existing field type hooks so custom field authors keep the same public extension points while callers stop knowing which pieces belong together.

Direct Known Subclasses

CurrencyStorageContract

Instance Method Summary collapse

Constructor Details

#initialize(field) ⇒ FieldStorageContract

Returns a new instance of FieldStorageContract.



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# File 'lib/typed_eav/field_storage_contract.rb', line 10

def initialize(field)
  @field = field
end

Instance Method Details

#after_snapshot(value_record, change_type) ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 53

def after_snapshot(value_record, change_type)
  case change_type.to_sym
  when :create, :update
    value_columns.to_h { |column| [column.to_s, value_record[column]] }
  when :destroy
    {}
  else
    raise ArgumentError, "Unsupported change_type: #{change_type.inspect}"
  end
end

#apply_default(value_record) ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 30

def apply_default(value_record)
  field.apply_default_to(value_record)
end

#before_snapshot(value_record, change_type) ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 38

def before_snapshot(value_record, change_type)
  case change_type.to_sym
  when :create
    {}
  when :update
    value_columns.to_h do |column|
      [column.to_s, value_record.attribute_before_last_save(column.to_s)]
    end
  when :destroy
    value_columns.to_h { |column| [column.to_s, value_record[column]] }
  else
    raise ArgumentError, "Unsupported change_type: #{change_type.inspect}"
  end
end

#changed?(value_record) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/typed_eav/field_storage_contract.rb', line 34

def changed?(value_record)
  value_columns.any? { |column| value_record.saved_change_to_attribute?(column) }
end

#query_column(operator) ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 18

def query_column(operator)
  field.class.operator_column(operator)
end

#read(value_record) ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 22

def read(value_record)
  field.read_value(value_record)
end

#value_columns ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 14

def value_columns
  field.class.value_columns
end

#write(value_record, casted) ⇒ Object 



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# File 'lib/typed_eav/field_storage_contract.rb', line 26

def write(value_record, casted)
  field.write_value(value_record, casted)
end