Class: DataMapper::WAZTables::Adapter

Inherits:
Adapters::AbstractAdapter
  • Object
show all
Defined in:
lib/dm-waztables-adapter/adapter.rb

Instance Method Summary collapse

Constructor Details

#initialize(name, options = {}) ⇒ Adapter

Returns a new instance of Adapter.



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# File 'lib/dm-waztables-adapter/adapter.rb', line 5

def initialize(name, options = {})
  super
  WAZ::Storage::Base.establish_connection!(:account_name => options[:account_name], :access_key => options[:access_key])
end

Instance Method Details

#create(resources) ⇒ Object 



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# File 'lib/dm-waztables-adapter/adapter.rb', line 11

def create(resources)
  service = WAZ::Tables::Table.service_instance
  resources.each do |resource|
    entity = {:row_key => resource.key.first}
    entity.merge!({:partition_key => resource.model.storage_name})
    resource.attributes.each { |a| entity.merge!({ a[0].to_sym => a[1] }) }
    service.insert_entity(resource.model.storage_name, entity)
  end
  resources.size
end

#delete(resources) ⇒ Object 



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# File 'lib/dm-waztables-adapter/adapter.rb', line 73

def delete(resources)
  service = WAZ::Tables::Table.service_instance
  resources.each do |resource|
    service.delete_entity(resource.model.storage_name, resource.model.storage_name, resource.id)
  end
  resources.size
end

#read(query) ⇒ Object 



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# File 'lib/dm-waztables-adapter/adapter.rb', line 23

def read(query)
  service = WAZ::Tables::Table.service_instance
  operator_mapping = {:gt => 'gt', :lt => 'lt', :gte => 'ge', :lte => 'le', :not => 'ne', :eql => 'eq'}

  conditions = query.conditions.map do |c|
    unless (c.class.name.eql?('Array'))
      case c.slug
        when :not then 
          "(#{c.operand.to_s.gsub(%r{=}, operator_mapping[c.slug]).gsub(%r{"}, "'")})"              
        when :like then
          # 
          name, value = c.subject.name, c.value.delete('%')
          (c.value =~ /^%/) ? "endswith(#{name}, '#{value}')" : ((c.value =~ /%$/) ? "startswith(#{name}, '#{value}')" : "(#{name} eq '#{value}')")
        when :regexp then
        else 
          "(#{c.subject.name} #{operator_mapping[c.slug]} #{c.value.class.name =~ /Fixnum|Float|Bignum/ ? c.value : "'#{c.value}'"})"
      end
    else
      query.conditions
    end
  end

  query_options = {:expression => conditions.sort.compact.join(' and ')}
  query_options.merge!({:top => query.limit}) if query.limit

  result = service.query(query.model.storage_name, query_options)

  records = result.map do |item|
    record = {}
    item.each { |k,v| record.merge!( { k.to_s => v } ) }
    record
  end
  
  query.filter_records(records)
end

#update(attributes, resources) ⇒ Object 



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# File 'lib/dm-waztables-adapter/adapter.rb', line 60

def update(attributes, resources)
  service = WAZ::Tables::Table.service_instance
  resources.each do |resource|
    entity = service.get_entity(resource.model.storage_name, resource.model.storage_name, resource.id)
    attributes.each do |attribute|
      entity[attribute[0].name] = attribute[1]
    end
    entity = service.update_entity(resource.model.storage_name, entity)
  end
  resources.size
end