Class: Dynamoid::AdapterPlugin::AwsSdkV3::ItemUpdater

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb

Overview

Mimics behavior of the yielded object on DynamoDB’s update_item API (high level).

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(table, key, range_key = nil) ⇒ ItemUpdater

Returns a new instance of ItemUpdater.



10
11
12
13
14
15
16
17
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 10

def initialize(table, key, range_key = nil)
  @table = table
  @key = key
  @range_key = range_key
  @additions = {}
  @deletions = {}
  @updates   = {}
end

Instance Attribute Details

#key ⇒ Object (readonly)

Returns the value of attribute key.



8
9
10
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 8

def key
  @key
end

#range_key ⇒ Object (readonly)

Returns the value of attribute range_key.



8
9
10
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 8

def range_key
  @range_key
end

#table ⇒ Object (readonly)

Returns the value of attribute table.



8
9
10
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 8

def table
  @table
end

Instance Method Details

#add(values) ⇒ Object

Adds the given values to the values already stored in the corresponding columns. The column must contain a Set or a number.

Parameters:

  • vals (Hash) —

    keys of the hash are the columns to update, vals are the values to add. values must be a Set, Array, or Numeric



26
27
28
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 26

def add(values)
  @additions.merge!(sanitize_attributes(values))
end

#delete(values) ⇒ Object

Removes values from the sets of the given columns

Parameters:

  • values (Hash) —

    keys of the hash are the columns, values are Arrays/Sets of items to remove



36
37
38
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 36

def delete(values)
  @deletions.merge!(sanitize_attributes(values))
end

#set(values) ⇒ Object

Replaces the values of one or more attributes



43
44
45
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 43

def set(values)
  @updates.merge!(sanitize_attributes(values))
end

#to_h ⇒ Object

Returns an AttributeUpdates hash suitable for passing to the V2 Client API



50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
# File 'lib/dynamoid/adapter_plugin/aws_sdk_v3/item_updater.rb', line 50

def to_h
  ret = {}

  @additions.each do |k, v|
    ret[k.to_s] = {
      action: ADD,
      value: v
    }
  end
  @deletions.each do |k, v|
    ret[k.to_s] = {
      action: DELETE,
      value: v
    }
  end
  @updates.each do |k, v|
    ret[k.to_s] = {
      action: PUT,
      value: v
    }
  end

  ret
end