grape expose format_with: datetime, if: {type: :full}

grape_format_with_if.rb

module Entities::Admin
  class OptionType < Grape::Entity
    expose :id, documentation: {type: String, desc: 'ID'}
    expose :name, documentation: {type: String, desc: '商品属性名称'}
    expose :group_name, documentation: {type: String, desc: '属性群名称'}
    expose :required, documentation: {type: Boolean, desc: '是否必填'}
    expose :position, documentation: {type: Boolean, desc: '排序号'}
    expose :phone_category_id, documentation: {type: String, desc: '商品类别ID'}, if: { type: :full }
    expose :values, documentation: {type: String, desc: '商品属性值'}, if: { type: :full }
    expose :category_names, documentation: {type: String, desc: '商品属性值'}, if: { type: :full }
    expose :created_at, documentation: {type: DateTime, desc: '创建时间'}, format_with: :datetime, if: { type: :full }

  end
end