Class: AWS::S3::ObjectMetadata

Inherits:
Object
  • Object
show all
Defined in:
lib/aws/s3/object_metadata.rb

Overview

Returns an object that represents the metadata for an S3 object.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object, options = {}) ⇒ ObjectMetadata

Returns a new instance of ObjectMetadata.

Parameters:

  • object (S3Object)
  • options (Hash) (defaults to: {})

Options Hash (options):

  • :version_id (String) —

    A specific version of the object to get metadata for



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# File 'lib/aws/s3/object_metadata.rb', line 26

def initialize object, options = {}
  @object = object
  @version_id = options[:version_id]
  super
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(name, *args, &blk) ⇒ String?

Proxies the method to #[].

Returns:

  • (String, nil) —

    Returns the metadata for the given name.



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# File 'lib/aws/s3/object_metadata.rb', line 78

def method_missing name, *args, &blk
  return super if !args.empty? || blk
  self[name]
end

Instance Attribute Details

#object ⇒ S3Object (readonly)

Returns:



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# File 'lib/aws/s3/object_metadata.rb', line 33

def object
  @object
end

Instance Method Details

#[](name) ⇒ String?

Returns the value for the given name stored in the S3Object's metadata:

bucket.objects['myobject'].metadata['purpose']
# returns nil if the given metadata key has not been set

Parameters:

  • name (String, Symbol) —

    The name of the metadata field to get.

Returns:

  • (String, nil) —

    Returns the metadata for the given name.



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# File 'lib/aws/s3/object_metadata.rb', line 45

def [] name
  to_h[name.to_s]
end

#[]=(name, value) ⇒ String?

Note:

The name and value of each metadata field must conform to US-ASCII.

Changes the value of the given name stored in the S3Object's metadata:

object = bucket.object['myobject']
object.metadata['purpose'] = 'research'
object.metadata['purpose']               # => 'research'

Parameters:

  • name (String, Symbol) —

    The name of the metadata field to set.

  • value (String) —

    The new value of the metadata field.

Returns:

  • (String, nil) —

    Returns the value that was set.



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# File 'lib/aws/s3/object_metadata.rb', line 65

def []= name, value
  raise "cannot change the metadata of an object version; "+
    "use S3Object#write to create a new version with different metadata" if
    @version_id
  metadata = to_h.dup
  metadata[name.to_s] = value
  object.copy_from(object.key,
                   :metadata => metadata)
  value
end

#to_h ⇒ Hash

Returns the user-generated metadata stored with this S3 Object.

Returns:

  • (Hash) —

    Returns the user-generated metadata stored with this S3 Object.



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# File 'lib/aws/s3/object_metadata.rb', line 85

def to_h
  options = {}
  options[:bucket_name] = object.bucket.name
  options[:key] = object.key
  options[:version_id] = @version_id if @version_id
  client.head_object(options).meta
end