Module: ActiveItem::DatabaseHelpers

Included in:
Base
Defined in:
lib/active_item/database_helpers.rb

Instance Method Summary collapse

Instance Method Details

#delete(key) ⇒ Object 



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# File 'lib/active_item/database_helpers.rb', line 20

def delete(key)
  dynamodb.delete_item(table_name: table_name, key: key)
rescue Aws::DynamoDB::Errors::AccessDeniedException => e
  raise_access_denied('DeleteItem', e)
end

#exists?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_item/database_helpers.rb', line 26

def exists?(key)
  !get(key).nil?
end

#get(key) ⇒ Object 



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# File 'lib/active_item/database_helpers.rb', line 7

def get(key)
  response = dynamodb.get_item(table_name: table_name, key: key)
  response.item
rescue Aws::DynamoDB::Errors::AccessDeniedException => e
  raise_access_denied('GetItem', e)
end

#put(item) ⇒ Object 



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# File 'lib/active_item/database_helpers.rb', line 14

def put(item)
  dynamodb.put_item(table_name: table_name, item: item)
rescue Aws::DynamoDB::Errors::AccessDeniedException => e
  raise_access_denied('PutItem', e)
end

#query(key_condition_expression:, expression_attribute_values:, **options) ⇒ Object 



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# File 'lib/active_item/database_helpers.rb', line 30

def query(key_condition_expression:, expression_attribute_values:, **options)
  query_params = {
    table_name: table_name,
    key_condition_expression: key_condition_expression,
    expression_attribute_values: expression_attribute_values
  }.merge(options)

  response = dynamodb.query(query_params)
  response.items
rescue Aws::DynamoDB::Errors::AccessDeniedException => e
  raise_access_denied('Query', e)
end

#scan(limit: nil, filter_expression: nil, expression_attribute_names: nil, expression_attribute_values: nil, projection_expression: nil) ⇒ Object 



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# File 'lib/active_item/database_helpers.rb', line 43

def scan(limit: nil, filter_expression: nil, expression_attribute_names: nil, expression_attribute_values: nil, projection_expression: nil)
  params = { table_name: table_name }
  params[:limit] = limit if limit
  params[:filter_expression] = filter_expression if filter_expression
  params[:expression_attribute_names] = expression_attribute_names if expression_attribute_names
  params[:expression_attribute_values] = expression_attribute_values if expression_attribute_values
  params[:projection_expression] = projection_expression if projection_expression

  items = []
  seen_ids = Set.new
  last_evaluated_key = nil

  loop do
    params[:exclusive_start_key] = last_evaluated_key if last_evaluated_key
    response = dynamodb.scan(params)

    response.items.each do |item|
      pk_value = item[primary_key.to_s]
      unless seen_ids.include?(pk_value)
        seen_ids.add(pk_value)
        items << item
      end
    end

    last_evaluated_key = response.last_evaluated_key
    break unless last_evaluated_key
    break if limit && items.length >= limit
  end

  items
rescue Aws::DynamoDB::Errors::AccessDeniedException => e
  raise_access_denied('Scan', e)
end