Class: SimpleRecord::ActiveSdb::Base

Inherits:
Object
  • Object
show all
Extended by:
ActiveSdbConnect
Defined in:
lib/simple_record/active_sdb.rb

Direct Known Subclasses

Base

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ActiveSdbConnect

close_connection, establish_connection

Constructor Details

#initialize(attrs = {}) ⇒ Base

Create new Item instance. attrs is a hash: { attribute1 => values1, …, attributeN => valuesN }.

item = Client.new('name' => 'Jon', 'toys' => ['girls', 'beer', 'pub'])
puts item.inspect   #=> #<Client:0xb77a2698 @new_record=true, @attributes={"name"=>["Jon"], "toys"=>["girls", "beer", "pub"]}>
item.save           #=> {"name"=>["Jon"], "id"=>"c03edb7e-e45c-11dc-bede-001bfc466dd7", "toys"=>["girls", "beer", "pub"]}
puts item.inspect   #=> #<Client:0xb77a2698 @new_record=false, @attributes={"name"=>["Jon"], "id"=>"c03edb7e-e45c-11dc-bede-001bfc466dd7", "toys"=>["girls", "beer", "pub"]}>



658
659
660
661
 
# File 'lib/simple_record/active_sdb.rb', line 658

def initialize(attrs={})
    @attributes = uniq_values(attrs)
    @new_record = true
end

Class Attribute Details

.next_token ⇒ Object

next_token value returned by last find: is useful to continue finding



168
169
170
 
# File 'lib/simple_record/active_sdb.rb', line 168

def next_token
  @next_token
end

Instance Attribute Details

#attributes ⇒ Object

Returns a hash of all the attributes.

puts item.attributes.inspect #=> {"name"=>["Cat"], "id"=>"2937601a-e45d-11dc-a75f-001bfc466dd7", "toys"=>["Jons socks", "clew", "mice"]}



645
646
647
 
# File 'lib/simple_record/active_sdb.rb', line 645

def attributes
  @attributes
end

#id ⇒ Object

Returns an item id. Same as: item or item.attributes



648
649
650
 
# File 'lib/simple_record/active_sdb.rb', line 648

def id
  @id
end

Class Method Details

.connection ⇒ Object

Returns a Aws::SdbInterface object

class A < Aws::ActiveSdb::Base
end

class B < Aws::ActiveSdb::Base
end

class C < Aws::ActiveSdb::Base
end

Aws::ActiveSdb.establish_connection 'key_id_1', 'secret_key_1'

C.establish_connection 'key_id_2', 'secret_key_2'

# A and B uses the default connection, C - uses its own
puts A.connection  #=> #<Aws::SdbInterface:0xb76d6d7c>
puts B.connection  #=> #<Aws::SdbInterface:0xb76d6d7c>
puts C.connection  #=> #<Aws::SdbInterface:0xb76d6ca0>



190
191
192
 
# File 'lib/simple_record/active_sdb.rb', line 190

def connection
    @connection || ActiveSdb::connection
end

.create(attributes = {}) ⇒ Object

Create and save new Item instance. Attributes is a hash: { attribute1 => values1, …, attributeN => valuesN }.

item = Client.create('name' => 'Cat', 'toys' => ['Jons socks', 'mice', 'clew'])
puts item.inspect   #=> #<Client:0xb77a0a78 @new_record=false, @attributes={"name"=>["Cat"], "id"=>"2937601a-e45d-11dc-a75f-001bfc466dd7", "toys"=>["Jons socks", "mice", "clew"]}>



674
675
676
677
678
 
# File 'lib/simple_record/active_sdb.rb', line 674

def self.create(attributes={})
    item = self.new(attributes)
    item.save
    item
end

.create_domain(dom = nil) ⇒ Object

Create domain at SDB. Raises no errors if the domain already exists.

class Client < Aws::ActiveSdb::Base
end
Client.create_domain  #=> {:request_id=>"6fc652a0-0000-41d5-91f4-3ed390a3d3b2", :box_usage=>"0.0055590278"}



243
244
245
246
247
 
# File 'lib/simple_record/active_sdb.rb', line 243

def create_domain(dom=nil)
    dom = domain if dom.nil?
    puts "Creating new SimpleDB Domain: " + dom
    connection.create_domain(dom)
end

.delete_domain(dom = nil) ⇒ Object

Remove domain from SDB. Raises no errors if the domain does not exist.

class Client < Aws::ActiveSdb::Base
end
Client.delete_domain  #=> {:request_id=>"e14d90d3-0000-4898-9995-0de28cdda270", :box_usage=>"0.0055590278"}



256
257
258
259
260
 
# File 'lib/simple_record/active_sdb.rb', line 256

def delete_domain(dom=nil)
    dom = domain if dom.nil?
    puts "!!! DELETING SimpleDB Domain: " + dom
    connection.delete_domain(dom)
end

.domain ⇒ Object

Current domain name.

# if 'ActiveSupport' is not loaded then class name converted to downcase
class Client < Aws::ActiveSdb::Base
end
puts Client.domain  #=> 'client'

# if 'ActiveSupport' is loaded then class name being tableized
require 'activesupport'
class Client < Aws::ActiveSdb::Base
end
puts Client.domain  #=> 'clients'

# Explicit domain name definition
class Client < Aws::ActiveSdb::Base
  set_domain_name :foreign_clients
end
puts Client.domain  #=> 'foreign_clients'



215
216
217
218
219
220
221
222
223
224
 
# File 'lib/simple_record/active_sdb.rb', line 215

def domain
    unless @domain
        if defined? ActiveSupport::CoreExtensions::String::Inflections
            @domain = name.tableize
        else
            @domain = name.downcase
        end
    end
    @domain
end

.find(*args) ⇒ Object

See select(), original find with QUERY syntax is deprecated so now find and select are synonyms.



265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
 
# File 'lib/simple_record/active_sdb.rb', line 265

def find(*args)
    options = args.last.is_a?(Hash) ? args.pop : {}
    case args.first
        when nil then
            raise "Invalid parameters passed to find: nil."
        when :all then
            sql_select(options)[:items]
        when :first then
            sql_select(options.merge(:limit => 1))[:items].first
        when :count then
            res = sql_select(options.merge(:count => true))[:count]
            res
        else
            res = select_from_ids(args, options)
            return res[:single] if res[:single]
            return res[:items]
    end
end

.find_with_metadata(*args) ⇒ Object

Same as find, but will return SimpleDB metadata like :request_id and :box_usage



287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
 
# File 'lib/simple_record/active_sdb.rb', line 287

def find_with_metadata(*args)
    options = args.last.is_a?(Hash) ? args.pop : {}
    case args.first
        when nil then
            raise "Invalid parameters passed to find: nil."
        when :all then
            sql_select(options)
        when :first then
            sql_select(options.merge(:limit => 1))
        when :count then
            res = sql_select(options.merge(:count => true))
            res
        else
            select_from_ids args, options
    end
end

.generate_id ⇒ Object

:nodoc:



357
358
359
 
# File 'lib/simple_record/active_sdb.rb', line 357

def generate_id # :nodoc:
    UUIDTools::UUID.timestamp_create().to_s
end

.select(*args) ⇒ Object

Perform a SQL-like select request.

Single record:

Client.select(:first)
Client.select(:first, :conditions=> [ "name=? AND wife=?", "Jon", "Sandy"])
Client.select(:first, :conditions=> { :name=>"Jon", :wife=>"Sandy" }, :select => :girfriends)

Bunch of records:

Client.select(:all)
Client.select(:all, :limit => 10)
Client.select(:all, :conditions=> [ "name=? AND 'girlfriend'=?", "Jon", "Judy"])
Client.select(:all, :conditions=> { :name=>"Sandy" }, :limit => 3)

Records by ids:

Client.select('1')
Client.select('1234987b4583475347523948')
Client.select('1','2','3','4', :conditions=> ["toys=?", "beer"])

Find helpers: Aws::ActiveSdb::Base.select_by_… and Aws::ActiveSdb::Base.select_all_by_…

Client.select_by_name('Matias Rust')
Client.select_by_name_and_city('Putin','Moscow')
Client.select_by_name_and_city_and_post('Medvedev','Moscow','president')

Client.select_all_by_author('G.Bush jr')
Client.select_all_by_age_and_gender_and_ethnicity('34','male','russian')
Client.select_all_by_gender_and_country('male', 'Russia', :order => 'name')

Continue listing:

# initial listing
Client.select(:all, :limit => 10)
# continue listing
begin
  Client.select(:all, :limit => 10, :next_token => Client.next_token)
end while Client.next_token

Sort oder:
If :order=>'attribute' option is specified then result response (ordered by 'attribute') will contain only items where attribute is defined (is not null).

  Client.select(:all)                         # returns all records
  Client.select(:all, :order => 'gender')     # returns all records ordered by gender where gender attribute exists
  Client.select(:all, :order => 'name desc')  # returns all records ordered by name in desc order where name attribute exists

see docs.amazonwebservices.com/AmazonSimpleDB/2007-11-07/DeveloperGuide/index.html?UsingSelect.html



353
354
355
 
# File 'lib/simple_record/active_sdb.rb', line 353

def select(*args)
    find(*args)
end

.set_domain_name(domain) ⇒ Object

Change the default domain name to user defined.

class Client < Aws::ActiveSdb::Base
  set_domain_name :foreign_clients
end



232
233
234
 
# File 'lib/simple_record/active_sdb.rb', line 232

def set_domain_name(domain)
    @domain = domain.to_s
end

Instance Method Details

#[](attribute) ⇒ Object

Returns the values of the attribute identified by attribute.

puts item['Cat'].inspect  #=> ["Jons socks", "clew", "mice"]



729
730
731
 
# File 'lib/simple_record/active_sdb.rb', line 729

def [](attribute)
    @attributes[attribute.to_s]
end

#[]=(attribute, values) ⇒ Object

Updates the attribute identified by attribute with the specified values.

puts item['Cat'].inspect  #=> ["Jons socks", "clew", "mice"]
item['Cat'] = ["Whiskas", "chicken"]
puts item['Cat'].inspect  #=> ["Whiskas", "chicken"]



739
740
741
742
743
 
# File 'lib/simple_record/active_sdb.rb', line 739

def []=(attribute, values)
    attribute              = attribute.to_s
    @attributes[attribute] = attribute == 'id' ? values.to_s : values.is_a?(Array) ? values.uniq : [values]

end

#apres_save2 ⇒ Object 



887
888
889
 
# File 'lib/simple_record/active_sdb.rb', line 887

def apres_save2
    mark_as_old
end

#connection ⇒ Object 



716
717
718
 
# File 'lib/simple_record/active_sdb.rb', line 716

def connection
    self.class.connection
end

#delete(options = {}) ⇒ Object

Delete the Item entirely from SDB.

sandy = Client.find_by_name 'Sandy'
sandy.reload
sandy.inspect       #=> #<Client:0xb7761d28 @new_record=false, @attributes={"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["boys", "kids", "patchwork"}>
puts sandy.delete
sandy.reload
puts sandy.inspect  #=> #<Client:0xb7761d28 @attributes={}, @new_record=false>



970
971
972
973
 
# File 'lib/simple_record/active_sdb.rb', line 970

def delete(options={})
    raise_on_id_absence
    connection.delete_attributes(options[:domain] || domain, id)
end

#delete_attributes(*attrs_list) ⇒ Object

Removes specified attributes from the item. attrs_list is an array or comma separated list of attributes names. Returns the list of deleted attributes.

sandy = Client.find_by_name 'Sandy'
sandy.reload
puts sandy.inspect                   #=> #<Client:0xb7761d28 @new_record=false, @attributes={"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["boys", "kids", "patchwork"}>
puts sandy.delete_attributes('toys') #=> ['toys']
puts sandy.inspect                   #=> #<Client:0xb7761d28 @new_record=false, @attributes={"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7"}>



950
951
952
953
954
955
956
957
958
959
 
# File 'lib/simple_record/active_sdb.rb', line 950

def delete_attributes(*attrs_list)
    raise_on_id_absence
    attrs_list = attrs_list.flatten.map { |attribute| attribute.to_s }
    attrs_list.delete('id')
    unless attrs_list.blank?
        connection.delete_attributes(domain, id, attrs_list)
        attrs_list.each { |attribute| @attributes.delete(attribute) }
    end
    attrs_list
end

#delete_values(attrs) ⇒ Object

Remove specified values from corresponding attributes. attrs is a hash: { attribute1 => values1, …, attributeN => valuesN }.

sandy = Client.find_by_name 'Sandy'
sandy.reload
puts sandy.inspect                                #=> #<Client:0xb77b48fc @new_record=false, @attributes={"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["boys", "kids", "patchwork"]}>
puts sandy.delete_values('toys' => 'patchwork')   #=> { 'toys' => ['patchwork'] }
puts sandy.inspect                                #=> #<Client:0xb77b48fc @new_record=false, @attributes={"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["boys", "kids"]}>



921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
 
# File 'lib/simple_record/active_sdb.rb', line 921

def delete_values(attrs)
    raise_on_id_absence
    attrs = uniq_values(attrs)
    attrs.delete('id')
    unless attrs.blank?
        connection.delete_attributes(domain, id, attrs)
        attrs.each do |attribute, values|
            # remove the values from the attribute
            if @attributes[attribute]
                @attributes[attribute] -= values
            else
                # if the attribute is unknown remove it from a resulting list of fixed attributes
                attrs.delete(attribute)
            end
        end
    end
    attrs
end

#domain ⇒ Object

Item domain name.



721
722
723
 
# File 'lib/simple_record/active_sdb.rb', line 721

def domain
    self.class.domain
end

#initialize_from_db(attrs = {}) ⇒ Object

This is to separate initialization from user vs coming from db (ie: find())



664
665
666
 
# File 'lib/simple_record/active_sdb.rb', line 664

def initialize_from_db(attrs={})
    initialize(attrs)
end

#mark_as_old ⇒ Object

:nodoc:



980
981
982
 
# File 'lib/simple_record/active_sdb.rb', line 980

def mark_as_old # :nodoc:
    @new_record = false
end

#new_record? ⇒ Boolean

Returns true if this object hasn�t been saved yet.

Returns:

  • (Boolean) 


976
977
978
 
# File 'lib/simple_record/active_sdb.rb', line 976

def new_record?
    @new_record
end

#pre_save2 ⇒ Object 



882
883
884
885
 
# File 'lib/simple_record/active_sdb.rb', line 882

def pre_save2
    @attributes = uniq_values(@attributes)
    prepare_for_update
end

#put ⇒ Object

Stores in-memory attributes to SDB. Adds the attributes values to already stored at SDB. Returns a hash of stored attributes.

sandy = Client.new(:name => 'Sandy') #=> #<Client:0xb775a7a8 @attributes={"name"=>["Sandy"]}, @new_record=true>
sandy['toys'] = 'boys'
sandy.put
sandy['toys'] = 'patchwork'
sandy.put
sandy['toys'] = 'kids'
sandy.put
puts sandy.attributes.inspect        #=> {"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["kids"]}
sandy.reload                         #=> {"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["boys", "kids", "patchwork"]}

compare to save method



806
807
808
809
810
811
812
813
814
815
 
# File 'lib/simple_record/active_sdb.rb', line 806

def put
    @attributes = uniq_values(@attributes)
    prepare_for_update
    attrs       = @attributes.dup
    attrs.delete('id')
    connection.put_attributes(domain, id, attrs) unless attrs.blank?
    connection.put_attributes(domain, id, {'id' => id}, :replace)
    mark_as_old
    @attributes
end

#put_attributes(attrs) ⇒ Object

Stores specified attributes. attrs is a hash: { attribute1 => values1, …, attributeN => valuesN }. Returns a hash of saved attributes.

see to put method



822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
 
# File 'lib/simple_record/active_sdb.rb', line 822

def put_attributes(attrs)
    attrs = uniq_values(attrs)
    prepare_for_update
    # if 'id' is present in attrs hash:
    # replace internal 'id' attribute and remove it from the attributes to be sent
    @attributes['id'] = attrs['id'] unless attrs['id'].blank?
    attrs.delete('id')
    # add new values to all attributes from list
    connection.put_attributes(domain, id, attrs) unless attrs.blank?
    connection.put_attributes(domain, id, {'id' => id}, :replace)
    attrs.each do |attribute, values|
        @attributes[attribute] ||= []
        @attributes[attribute] += values
        @attributes[attribute].uniq!
    end
    mark_as_old
    attributes
end

#reload ⇒ Object

Reload attributes from SDB. Replaces in-memory attributes.

item = Client.find_by_name('Cat')  #=> #<Client:0xb77d0d40 @attributes={"id"=>"2937601a-e45d-11dc-a75f-001bfc466dd7"}, @new_record=false>
item.reload                        #=> #<Client:0xb77d0d40 @attributes={"id"=>"2937601a-e45d-11dc-a75f-001bfc466dd7", "name"=>["Cat"], "toys"=>["Jons socks", "clew", "mice"]}, @new_record=false>



750
751
752
753
754
755
756
757
758
759
760
761
 
# File 'lib/simple_record/active_sdb.rb', line 750

def reload
    raise_on_id_absence
    old_id      = id
    attrs       = connection.get_attributes(domain, id)[:attributes]
    @attributes = {}
    unless attrs.blank?
        attrs.each { |attribute, values| @attributes[attribute] = values }
        @attributes['id'] = old_id
    end
    mark_as_old
    @attributes
end

#reload_attributes(*attrs_list) ⇒ Object

Reload a set of attributes from SDB. Adds the loaded list to in-memory data. attrs_list is an array or comma separated list of attributes names. Returns a hash of loaded attributes.

This is not the best method to get a bunch of attributes because a web service call is being performed for every attribute.

item = Client.find_by_name('Cat')
item.reload_attributes('toys', 'name')   #=> {"name"=>["Cat"], "toys"=>["Jons socks", "clew", "mice"]}



773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
 
# File 'lib/simple_record/active_sdb.rb', line 773

def reload_attributes(*attrs_list)
    raise_on_id_absence
    attrs_list = attrs_list.flatten.map { |attribute| attribute.to_s }
    attrs_list.delete('id')
    result     = {}
    attrs_list.flatten.uniq.each do |attribute|
        attribute = attribute.to_s
        values    = connection.get_attributes(domain, id, attribute)[:attributes][attribute]
        unless values.blank?
            @attributes[attribute] = result[attribute] = values
        else
            @attributes.delete(attribute)
        end
    end
    mark_as_old
    result
end

#save2(options = {}) ⇒ Object

Store in-memory attributes to SDB. Replaces the attributes values already stored at SDB by in-memory data. Returns a hash of stored attributes.

sandy = Client.new(:name => 'Sandy')  #=> #<Client:0xb775a7a8 @attributes={"name"=>["Sandy"]}, @new_record=true>
sandy['toys'] = 'boys'
sandy.save
sandy['toys'] = 'patchwork'
sandy.save
sandy['toys'] = 'kids'
sandy.save
puts sandy.attributes.inspect         #=> {"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["kids"]}
sandy.reload                          #=> {"name"=>["Sandy"], "id"=>"b2832ce2-e461-11dc-b13c-001bfc466dd7", "toys"=>["kids"]}

Options:

- :except => Array of attributes to NOT save

compare to put method



859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
 
# File 'lib/simple_record/active_sdb.rb', line 859

def save2(options={})
    options[:create_domain] = true if options[:create_domain].nil?
    pre_save2
    atts_to_save = @attributes.dup
    #puts 'atts_to_save=' + atts_to_save.inspect
    #options = params.first.is_a?(Hash) ? params.pop : {}
    if options[:except]
        options[:except].each do |e|
            atts_to_save.delete(e).inspect
        end
    end
    if options[:dirty] # Only used in simple_record right now
        # only save if the attribute is dirty
        dirty_atts = options[:dirty_atts]
        atts_to_save.delete_if { |key, value| !dirty_atts.has_key?(key) }
    end
    dom          = options[:domain] || domain
    #puts 'atts_to_save2=' + atts_to_save.inspect
    connection.put_attributes(dom, id, atts_to_save, :replace, options)
    apres_save2
    @attributes
end

#save_attributes(attrs) ⇒ Object

Replaces the attributes at SDB by the given values. Attrs is a hash: { attribute1 => values1, …, attributeN => valuesN }. The other in-memory attributes are not being saved. Returns a hash of stored attributes.

see save method



897
898
899
900
901
902
903
904
905
906
907
908
909
910
 
# File 'lib/simple_record/active_sdb.rb', line 897

def save_attributes(attrs)
    prepare_for_update
    attrs = uniq_values(attrs)
    # if 'id' is present in attrs hash then replace internal 'id' attribute
    unless attrs['id'].blank?
        @attributes['id'] = attrs['id']
    else
        attrs['id'] = id
    end
    connection.put_attributes(domain, id, attrs, :replace) unless attrs.blank?
    attrs.each { |attribute, values| attrs[attribute] = values }
    mark_as_old
    attrs
end