Module: DynaModel::Schema::ClassMethods

Defined in:
lib/dyna_model/schema.rb

Constant Summary collapse

KEY_TYPE = 
{
  hash: "HASH",
  range: "RANGE"
}
PROJECTION_TYPE = 
{
  keys_only: "KEYS_ONLY",
  all: "ALL",
  include: "INCLUDE"
}
ATTR_TYPES = 
{
  AWS::Record::Attributes::StringAttr => "S",
  AWS::Record::Attributes::IntegerAttr => "N",
  AWS::Record::Attributes::FloatAttr => "N",
  AWS::Record::Attributes::BooleanAttr => "N",
  AWS::Record::Attributes::DateTimeAttr => "S",
  AWS::Record::Attributes::DateAttr => "S",
  AWS::Record::Attributes::SerializedAttr => "B"
}

Instance Method Summary collapse

Instance Method Details

#attribute_definitions ⇒ Object

TODO - need to add projections?



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# File 'lib/dyna_model/schema.rb', line 113

def attribute_definitions
  # Keys for hash/range/secondary
  # S | N | B

  keys = []
  keys << hash_key[:attribute_name]
  keys << range_key[:attribute_name] if range_key
  local_secondary_indexes.each do |lsi|
    keys << lsi[:key_schema].select{|h| h[:key_type] == "RANGE"}.first[:attribute_name]
  end

  global_secondary_indexes.each do |lsi|
    lsi[:key_schema].each do |a|
      keys << a[:attribute_name]
    end
  end

  definitions = keys.uniq.collect do |k|
    attr = self.attributes[k.to_s]
    {
      attribute_name: attr.name,
      attribute_type: attribute_type_indicator(attr)
    }
  end
end

#attribute_type_indicator(attr) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 139

def attribute_type_indicator(attr)
  if attr_type = ATTR_TYPES[attr.class]
    attr_type
  else
    raise "unsupported attribute type #{attr.class}"
  end
end

#global_secondary_index(index_name, options = {}) ⇒ Object

{ hash_key: :hash_key_here, range_key: :optional_range_key_here } :name :projection :read_provision :write_provision



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# File 'lib/dyna_model/schema.rb', line 163

def global_secondary_index(index_name, options={})
  options[:projection] ||= :keys_only
  global_secondary_index_hash = {
    projection: {},
    provisioned_throughput: {
      read_capacity_units: options[:read_provision] || read_provision,
      write_capacity_units: options[:write_provision] || write_provision
    }
  }
  if options[:projection].is_a?(Array) && options[:projection].size > 0
    options[:projection].each do |non_key_attr|
      attr = self.attributes[non_key_attr.to_s]
      raise(ArgumentError, "Could not find attribute definition for projection on #{non_key_attr}") unless attr
      (global_secondary_index_hash[:projection][:non_key_attributes] ||= []) << attr.name
    end
    global_secondary_index_hash[:projection][:projection_type] = PROJECTION_TYPE[:include]
  else
    raise(ArgumentError, 'projection must be :all, :keys_only, Array (or attrs)') unless options[:projection] == :keys_only || options[:projection] == :all
    global_secondary_index_hash[:projection][:projection_type] = PROJECTION_TYPE[options[:projection]]
  end

  if !options.has_key?(:hash_key) || self.attributes[options[:hash_key].to_s].blank?
    raise(ArgumentError, "Could not find attribute definition for global secondary index on hash_key specified")
  end
  hash_key_attr = self.attributes[options[:hash_key].to_s]

  if options.has_key?(:range_key) && self.attributes[options[:range_key].to_s].blank?
    raise(ArgumentError, "Could not find attribute definition for global secondary index on range_key specified")
  end
  range_key_attr = nil
  range_key_attr = self.attributes[options[:range_key].to_s] if options.has_key?(:range_key)

  ## Force naming of index_name for lookup later
  #global_secondary_index_hash[:index_name] = (index_name.to_s || "#{hash_key_attr.name}#{"_#{range_key_attr.name}" if range_key_attr}_gsi_index".camelcase)
  global_secondary_index_hash[:index_name] = index_name.to_s

  global_secondary_index_hash[:key_schema] = [
    {
      attribute_name: hash_key_attr.name,
      key_type: KEY_TYPE[:hash]
    }
  ]
  global_secondary_index_hash[:key_schema] << {
    attribute_name: range_key_attr.name,
    key_type: KEY_TYPE[:range]
  } if range_key_attr

  return false if (@global_secondary_indexes ||= []).select {|i| i[:index_name] == global_secondary_index_hash[:index_name] }.present? # Do not add if we already have a range key set for this attr
  (@global_secondary_indexes ||= []) << global_secondary_index_hash
end

#global_secondary_indexes ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 154

def global_secondary_indexes
  @global_secondary_indexes ||= []
end

#guid_delimiter(val = nil) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 43

def guid_delimiter(val=nil)
  if val
    raise(ArgumentError, "Invalid guid_delimiter") if val.blank?
    @guid_delimiter = val.to_s
  else
    @guid_delimiter || DynaModel::Config.default_guid_delimiter
  end
end

#hash_key(hash_key_key = nil) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 78

def hash_key(hash_key_key=nil)
  if hash_key_key
    hash_key_attribute = self.attributes[hash_key_key.to_s]
    raise(ArgumentError, "Could not find attribute definition for hash_key #{hash_key_key}") unless hash_key_attribute
    raise(ArgumentError, "Invalid attribute type for hash_key") unless [AWS::Record::Attributes::StringAttr, AWS::Record::Attributes::IntegerAttr, AWS::Record::Attributes::FloatAttr].include?(hash_key_attribute.class)

    validates_presence_of hash_key_attribute.name.to_sym

    @dynamo_hash_key = {
      attribute_name: hash_key_attribute.name,
      key_type: KEY_TYPE[:hash]
    }
  else
    @dynamo_hash_key
  end
end

#key_schema ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/dyna_model/schema.rb', line 147

def key_schema
  raise(ArgumentError, 'hash_key was not set for this table') if @dynamo_hash_key.blank?
  schema = [hash_key]
  schema << range_key if range_key 
  schema
end

#local_secondary_index(range_key_attr, options = {}) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/dyna_model/schema.rb', line 218

def local_secondary_index(range_key_attr, options={})
  options[:projection] ||= :keys_only
  local_secondary_index_hash = {
    projection: {}
  }
  if options[:projection].is_a?(Array) && options[:projection].size > 0
    options[:projection].each do |non_key_attr|
      attr = self.attributes[non_key_attr.to_s]
      raise(ArgumentError, "Could not find attribute definition for projection on #{non_key_attr}") unless attr
      (local_secondary_index_hash[:projection][:non_key_attributes] ||= []) << attr.name
    end
    local_secondary_index_hash[:projection][:projection_type] = PROJECTION_TYPE[:include]
  else
    raise(ArgumentError, 'projection must be :all, :keys_only, Array (or attrs)') unless options[:projection] == :keys_only || options[:projection] == :all
    local_secondary_index_hash[:projection][:projection_type] = PROJECTION_TYPE[options[:projection]]
  end

  range_attr = self.attributes[range_key_attr.to_s]
  raise(ArgumentError, "Could not find attribute definition for local secondary index on #{range_key_attr}") unless range_attr
  local_secondary_index_hash[:index_name] = (options[:name] || options[:index_name] || "#{range_attr.name}_index".camelcase)

  hash_key_attr = self.attributes[hash_key[:attribute_name].to_s]
  raise(ArgumentError, "Could not find attribute definition for hash_key") unless hash_key_attr

  local_secondary_index_hash[:key_schema] = [
    {
      attribute_name: hash_key_attr.name,
      key_type: KEY_TYPE[:hash]
    },
    {
      attribute_name: range_attr.name,
      key_type: KEY_TYPE[:range]
    }
  ]
  return false if (@local_secondary_indexes ||= []).select {|i| i[:index_name] == local_secondary_index_hash[:index_name] }.present? # Do not add if we already have a range key set for this attr
  (@local_secondary_indexes ||= []) << local_secondary_index_hash
end

#local_secondary_indexes ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 214

def local_secondary_indexes
  @local_secondary_indexes ||= []
end

#range_key(range_key_key = nil) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 95

def range_key(range_key_key=nil)
  if range_key_key
    range_key_attribute = self.attributes[range_key_key.to_s]
    raise(ArgumentError, "Could not find attribute definition for range_key #{range_key_key}") unless range_key_attribute
    raise(ArgumentError, "Invalid attribute type for range_key") unless [AWS::Record::Attributes::StringAttr, AWS::Record::Attributes::IntegerAttr, AWS::Record::Attributes::FloatAttr, AWS::Record::Attributes::DateAttr, AWS::Record::Attributes::DateTimeAttr].include?(range_key_attribute.class)

    validates_presence_of range_key_attribute.name.to_sym

    @dynamo_range_key = {
      attribute_name: range_key_attribute.name,
      key_type: KEY_TYPE[:range]
    }
  else
    @dynamo_range_key
  end
end

#read_provision(val = nil) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 52

def read_provision(val=nil)
  if val
    raise(ArgumentError, "Invalid read provision") unless val.to_i >= 1
    @dynamo_read_provision = val.to_i
  else
    @dynamo_read_provision || DynaModel::Config.read_provision
  end
end

#table_prefix(val = nil) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 70

def table_prefix(val=nil)
  if val
    @dynamo_table_prefix = val
  else
    @dynamo_table_prefix || AWS::Record.table_prefix || "#{DynaModel::Config.namespace}#{Rails.application.class.parent_name.to_s.underscore.dasherize}-#{Rails.env}-"
  end
end

#table_schema ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 28

def table_schema
  schema = {
    table_name: dynamo_db_table_name,
    provisioned_throughput: {
      read_capacity_units: read_provision,
      write_capacity_units: write_provision
    },
    key_schema: key_schema,
    attribute_definitions: attribute_definitions
  }
  schema[:local_secondary_indexes] = local_secondary_indexes unless local_secondary_indexes.blank?
  schema[:global_secondary_indexes] = global_secondary_indexes unless global_secondary_indexes.blank?
  schema
end

#write_provision(val = nil) ⇒ Object 



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# File 'lib/dyna_model/schema.rb', line 61

def write_provision(val=nil)
  if val
    raise(ArgumentError, "Invalid write provision") unless val.to_i >= 1
    @dynamo_write_provision = val.to_i
  else
    @dynamo_write_provision || DynaModel::Config.write_provision
  end
end