Created
April 13, 2017 11:25
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Custom Validator for JSON in Rails
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| class MyObject < ActiveRecord::Base | |
| class JsonValidator < ActiveModel::EachValidator | |
| def initialize(options) | |
| options.reverse_merge!(:message => :invalid) | |
| super(options) | |
| end | |
| def validate_each(record, attribute_before_typecast, value) | |
| attribute = attribute_before_typecast.to_s.sub('_before_type_cast', '') | |
| value = value.strip if value.is_a?(String) | |
| JSON.parse(value) | |
| rescue JSON::ParserError, TypeError => exception | |
| record.errors.add(attribute, options[:message], exception_message: exception.message) | |
| end | |
| end | |
| validates :my_json_field_before_type_cast, presence: true, json: true | |
| end |
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