Class: ActiveRecord::ConnectionAdapters::PostgreSQL::OID::Hstore

Inherits:
Type::Value
  • Object
show all
Includes:
ActiveModel::Type::Helpers::Mutable
Defined in:
activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb

Overview

:nodoc:

Constant Summary collapse

ERROR = 
"Invalid Hstore document: %s"

Instance Method Summary collapse

Methods included from ActiveModel::Type::Helpers::Mutable

#cast, #immutable_value

Instance Method Details

#accessor ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb', line 81

def accessor
  ActiveRecord::Store::StringKeyedHashAccessor
end

#changed_in_place?(raw_old_value, new_value) ⇒ Boolean

Will compare the Hash equivalents of raw_old_value and new_value. By comparing hashes, this avoids an edge case where the order of the keys change between the two hashes, and they would not be marked as equal.

Returns:

  • (Boolean) 


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# File 'activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb', line 89

def changed_in_place?(raw_old_value, new_value)
  deserialize(raw_old_value) != new_value
end

#deserialize(value) ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb', line 18

def deserialize(value)
  return value unless value.is_a?(::String)

  scanner = StringScanner.new(value)
  hash = {}

  until scanner.eos?
    unless scanner.skip(/"/)
      raise(ArgumentError, ERROR % scanner.string.inspect)
    end

    unless key = scanner.scan(/^(\\[\\"]|[^\\"])*?(?=")/)
      raise(ArgumentError, ERROR % scanner.string.inspect)
    end

    unless scanner.skip(/"=>?/)
      raise(ArgumentError, ERROR % scanner.string.inspect)
    end

    if scanner.scan(/NULL/)
      value = nil
    else
      unless scanner.skip(/"/)
        raise(ArgumentError, ERROR % scanner.string.inspect)
      end

      unless value = scanner.scan(/^(\\[\\"]|[^\\"])*?(?=")/)
        raise(ArgumentError, ERROR % scanner.string.inspect)
      end

      unless scanner.skip(/"/)
        raise(ArgumentError, ERROR % scanner.string.inspect)
      end
    end

    key.gsub!('\"', '"')
    key.gsub!("\\\\", "\\")

    if value
      value.gsub!('\"', '"')
      value.gsub!("\\\\", "\\")
    end

    hash[key] = value

    unless scanner.skip(/, /) || scanner.eos?
      raise(ArgumentError, ERROR % scanner.string.inspect)
    end
  end

  hash
end

#serialize(value) ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb', line 71

def serialize(value)
  if value.is_a?(::Hash)
    value.map { |k, v| "#{escape_hstore(k)}=>#{escape_hstore(v)}" }.join(", ")
  elsif value.respond_to?(:to_unsafe_h)
    serialize(value.to_unsafe_h)
  else
    value
  end
end

#type ⇒ Object 



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# File 'activerecord/lib/active_record/connection_adapters/postgresql/oid/hstore.rb', line 14

def type
  :hstore
end