Class: DynamoDbFramework::Repository

Inherits:
Object
  • Object
show all
Defined in:
lib/dynamodb_framework/dynamodb_repository.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(store) ⇒ Repository

Returns a new instance of Repository.



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 10

def initialize(store)
  @dynamodb = store
end

Instance Attribute Details

#dynamodb ⇒ Object (readonly)

Returns the value of attribute dynamodb.



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 7

def dynamodb
  @dynamodb
end

#table_name ⇒ Object

Returns the value of attribute table_name.



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 8

def table_name
  @table_name
end

Instance Method Details

#all ⇒ Object 



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 91

def all

  result = dynamodb.client.scan({
                                    :table_name => @table_name
                                })

  output = []
  result.items.each do |item|
    hash_helper.hash_kit.indifferent!(item)
    output.push(item)
  end

  return output

end

#delete(keys) ⇒ Object 



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 36

def delete(keys)

  params =
      {
          table_name: @table_name,
          key: keys
      }

  dynamodb.client.delete_item(params)

  return true

end

#delete_item(partition_key:, partition_key_value:, range_key: nil, range_key_value: nil) ⇒ Object 



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 50

def delete_item(partition_key:, partition_key_value:, range_key: nil, range_key_value: nil)

  keys = {
      partition_key.to_s => clean_value(partition_key_value)
  }

  if range_key != nil
    keys[range_key.to_s] = clean_value(range_key_value)
  end

  params =
      {
          table_name: @table_name,
          key: keys
      }

  dynamodb.client.delete_item(params)

  return true

end

#get_by_key(partition_key, partition_value, range_key = nil, range_value = nil) ⇒ Object 



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 72

def get_by_key(partition_key, partition_value, range_key = nil, range_value = nil)

  key = {}
  key[partition_key] = clean_value(partition_value)
  if(range_key != nil)
    key[range_key] = clean_value(range_value)
  end

  params = {
      table_name: table_name,
      key: key
  }

  result = dynamodb.client.get_item(params)
  hash_helper.hash_kit.indifferent!(result.item)
  return result.item

end

#put(item) ⇒ Object

Store the hash of an object to the dynamodb table Note : [DateTime] attributes will be stored as an ISO8601 string

[Time] attributes will be stored as an Epoch Int

The intent is that if you need to sort in dynamo by dates, then make sure you use a [Time] type. The Epoch int allows you to compare properly as comparing date strings are not reliable.



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 19

def put(item)
  hash = to_hash(item)

  clean_hash(hash)

  params =
      {
          table_name: @table_name,
          item: hash
      }

  dynamodb.client.put_item(params)

  return true

end

#query(partition_key_name, partition_key_value, range_key_name = nil, range_key_value = nil, expression = nil, expression_params = nil, index_name = nil, limit = nil, count = false) ⇒ Object 



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 158

def query(partition_key_name, partition_key_value, range_key_name = nil, range_key_value = nil, expression = nil, expression_params = nil, index_name = nil, limit = nil, count = false)

  params = {
      table_name: table_name
  }

  if expression != nil
    params[:filter_expression] = expression
  end

  if index_name != nil
    params[:index_name] = index_name
  end

  if range_key_name != nil
    params[:key_condition_expression] = '#partition_key = :partition_key and #range_key = :range_key'
    params[:expression_attribute_names] = { '#partition_key' => partition_key_name, '#range_key' => range_key_name }
    params[:expression_attribute_values] = { ':partition_key' => clean_value(partition_key_value), ':range_key' => clean_value(range_key_value) }
  else
    params[:key_condition_expression] = '#partition_key = :partition_key'
    params[:expression_attribute_names] = { '#partition_key' => partition_key_name }
    params[:expression_attribute_values] = { ':partition_key' => clean_value(partition_key_value) }
  end

  if expression_params != nil
    expression_params.each do |key, value|
      if key[0] == '#'
        params[:expression_attribute_names][key] = clean_value(value)
      elsif key[0] == ':'
        params[:expression_attribute_values][key] = clean_value(value)
      end
    end

  end

  if limit != nil
    params[:limit] = limit
  end

  if count
    params[:select] = 'COUNT'
  else
    params[:select] = 'ALL_ATTRIBUTES'
  end

  result = dynamodb.client.query(params)

  if count
    return result.count
  else
    output = []
    result.items.each do |item|
      hash_helper.hash_kit.indifferent!(item)
      output.push(item)
    end

    return output
  end

end

#scan(expression, expression_params, limit = nil, count = false) ⇒ Object 



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# File 'lib/dynamodb_framework/dynamodb_repository.rb', line 107

def scan(expression, expression_params, limit = nil, count = false)

  params = {
      :table_name => table_name
  }

  if expression != nil
    params[:filter_expression] = expression
  end

  if expression_params != nil

    params[:expression_attribute_names] = {}
    params[:expression_attribute_values] = {}

    expression_params.each do |key, value|
      if key[0] == '#'
        params[:expression_attribute_names][key] = value
      elsif key[0] == ':'
        params[:expression_attribute_values][key] = clean_value(value)
      end
    end

  end

  if limit != nil
    params[:limit] = limit
  end

  if count
    params[:select] = 'COUNT'
  else
    params[:select] = 'ALL_ATTRIBUTES'
  end

  result = dynamodb.client.scan(params)

  if count
    return result.count
  else
    output = []
    result.items.each do |item|
      hash_helper.hash_kit.indifferent!(item)
      output.push(item)
    end

    return output
  end

end