### Home Classes Methods

### In Files

- lib/sequel/plugins/nested_attributes.rb

### Methods

- #nested_attributes_check_key_modifications
- #nested_attributes_create
- #nested_attributes_find
- #nested_attributes_list_setter
- #nested_attributes_remove
- #nested_attributes_set_attributes
- #nested_attributes_setter
- #nested_attributes_update
- #nested_attributes_update_attributes
- #validate_associated_object

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
- dataset_basics.rdoc
- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
- 2.11.0.txt
- 2.12.0.txt
- 2.2.0.txt
- 2.3.0.txt
- 2.4.0.txt
- 2.5.0.txt
- 2.6.0.txt
- 2.7.0.txt
- 2.8.0.txt
- 2.9.0.txt
- 3.0.0.txt
- 3.1.0.txt
- 3.10.0.txt
- 3.11.0.txt
- 3.12.0.txt
- 3.13.0.txt
- 3.14.0.txt
- 3.15.0.txt
- 3.16.0.txt
- 3.17.0.txt
- 3.18.0.txt
- 3.19.0.txt
- 3.2.0.txt
- 3.20.0.txt
- 3.21.0.txt
- 3.22.0.txt
- 3.23.0.txt
- 3.24.0.txt
- 3.25.0.txt
- 3.26.0.txt
- 3.27.0.txt
- 3.28.0.txt
- 3.29.0.txt
- 3.3.0.txt
- 3.30.0.txt
- 3.31.0.txt
- 3.32.0.txt
- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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# Sequel::Plugins::NestedAttributes::InstanceMethods

### Private Instance Methods

nested_attributes_check_key_modifications(reflection, obj) click to toggle source

Check that the keys related to the association are not modified inside the block. Does not use an ensure block, so callers should be careful.

         # File lib/sequel/plugins/nested_attributes.rb, line 133
    133:         def nested_attributes_check_key_modifications(reflection, obj)
    134:           keys = reflection.associated_object_keys.map{|x| obj.send(x)}
    135:           yield
    136:           raise(Error, "Modifying association dependent key(s) when updating associated objects is not allowed") unless keys == reflection.associated_object_keys.map{|x| obj.send(x)}
    137:         end

nested_attributes_create(reflection, attributes) click to toggle source

Create a new associated object with the given attributes, validate it when the parent is validated, and save it when the object is saved. Returns the object created.

         # File lib/sequel/plugins/nested_attributes.rb, line 142
    142:         def nested_attributes_create(reflection, attributes)
    143:           obj = reflection.associated_class.new
    144:           nested_attributes_set_attributes(reflection, obj, attributes)
    145:           after_validation_hook{validate_associated_object(reflection, obj)}
    146:           if reflection.returns_array?
    147:             send(reflection[:name]) << obj
    148:             after_save_hook{send(reflection.add_method, obj)}
    149:           else
    150:             associations[reflection[:name]] = obj
    151:             # Don't need to validate the object twice if :validate association option is not false
    152:             # and don't want to validate it at all if it is false.
    153:             send(reflection[:type] == :many_to_one ? :before_save_hook : :after_save_hook){send(reflection.setter_method, obj.save(:validate=>false))}
    154:           end
    155:           obj
    156:         end

nested_attributes_find(reflection, pk) click to toggle source

Find an associated object with the matching pk. If a matching option is not found and the :strict option is not false, raise an Error.

         # File lib/sequel/plugins/nested_attributes.rb, line 160
    160:         def nested_attributes_find(reflection, pk)
    161:           pk = pk.to_s
    162:           unless obj = Array(associated_objects = send(reflection[:name])).find{|x| x.pk.to_s == pk}
    163:             raise(Error, "no matching associated object with given primary key (association: #{reflection[:name]}, pk: #{pk})") unless reflection[:nested_attributes][:strict] == false
    164:           end
    165:           obj
    166:         end

nested_attributes_list_setter(reflection, attributes_list) click to toggle source

Take an array or hash of attribute hashes and set each one individually. If a hash is provided it, sort it by key and then use the values. If there is a limit on the nested attributes for this association, make sure the length of the attributes_list is not greater than the limit.

         # File lib/sequel/plugins/nested_attributes.rb, line 172
    172:         def nested_attributes_list_setter(reflection, attributes_list)
    173:           attributes_list = attributes_list.sort_by{|x| x.to_s}.map{|k,v| v} if attributes_list.is_a?(Hash)
    174:           if (limit = reflection[:nested_attributes][:limit]) && attributes_list.length > limit
    175:             raise(Error, "number of nested attributes (#{attributes_list.length}) exceeds the limit (#{limit})")
    176:           end
    177:           attributes_list.each{|a| nested_attributes_setter(reflection, a)}
    178:         end

nested_attributes_remove(reflection, pk, opts={}) click to toggle source

Remove the matching associated object from the current object. If the :destroy option is given, destroy the object after disassociating it (unless destroying the object would automatically disassociate it). Returns the object removed, if it exists.

         # File lib/sequel/plugins/nested_attributes.rb, line 184
    184:         def nested_attributes_remove(reflection, pk, opts={})
    185:           if obj = nested_attributes_find(reflection, pk)
    186:             if !opts[:destroy] || reflection.remove_before_destroy?
    187:               before_save_hook do
    188:                 if reflection.returns_array?
    189:                   send(reflection.remove_method, obj)
    190:                 else
    191:                   send(reflection.setter_method, nil)
    192:                 end
    193:               end
    194:             end
    195:             after_save_hook{obj.destroy} if opts[:destroy]
    196:             obj
    197:           end
    198:         end

nested_attributes_set_attributes(reflection, obj, attributes) click to toggle source

Set the fields in the obj based on the association, only allowing specific :fields if configured.

         # File lib/sequel/plugins/nested_attributes.rb, line 202
    202:         def nested_attributes_set_attributes(reflection, obj, attributes)
    203:           if fields = reflection[:nested_attributes][:fields]
    204:             obj.set_only(attributes, fields)
    205:           else
    206:             obj.set(attributes)
    207:           end
    208:         end

nested_attributes_setter(reflection, attributes) click to toggle source

Modify the associated object based on the contents of the attribtues hash:

- If a block was given to nested_attributes, call it with the attributes and return immediately if the block returns true.

- If no primary key exists in the attributes hash, create a new object.

- If _delete is a key in the hash and the :destroy option is used, destroy the matching associated object.

- If _remove is a key in the hash and the :remove option is used, disassociated the matching associated object.

- Otherwise, update the matching associated object with the contents of the hash.

         # File lib/sequel/plugins/nested_attributes.rb, line 216
    216:         def nested_attributes_setter(reflection, attributes)
    217:           return if (b = reflection[:nested_attributes][:reject_if]) && b.call(attributes)
    218:           modified!
    219:           klass = reflection.associated_class
    220:           if pk = attributes.delete(klass.primary_key) || attributes.delete(klass.primary_key.to_s)
    221:             if klass.db.send(:typecast_value_boolean, attributes[:_delete] || attributes['_delete']) && reflection[:nested_attributes][:destroy]
    222:               nested_attributes_remove(reflection, pk, :destroy=>true)
    223:             elsif klass.db.send(:typecast_value_boolean, attributes[:_remove] || attributes['_remove']) && reflection[:nested_attributes][:remove]
    224:               nested_attributes_remove(reflection, pk)
    225:             else
    226:               nested_attributes_update(reflection, pk, attributes)
    227:             end
    228:           else
    229:             nested_attributes_create(reflection, attributes)
    230:           end
    231:         end

nested_attributes_update(reflection, pk, attributes) click to toggle source

Update the matching associated object with the attributes, validating it when the parent object is validated and saving it when the parent is saved. Returns the object updated, if it exists.

         # File lib/sequel/plugins/nested_attributes.rb, line 237
    237:         def nested_attributes_update(reflection, pk, attributes)
    238:           if obj = nested_attributes_find(reflection, pk)
    239:             nested_attributes_update_attributes(reflection, obj, attributes)
    240:             after_validation_hook{validate_associated_object(reflection, obj)}
    241:             # Don't need to validate the object twice if :validate association option is not false
    242:             # and don't want to validate it at all if it is false.
    243:             after_save_hook{obj.save_changes(:validate=>false)}
    244:             obj
    245:           end
    246:         end

nested_attributes_update_attributes(reflection, obj, attributes) click to toggle source

Update the attributes for the given object related to the current object through the association.

         # File lib/sequel/plugins/nested_attributes.rb, line 249
    249:         def nested_attributes_update_attributes(reflection, obj, attributes)
    250:           nested_attributes_check_key_modifications(reflection, obj) do
    251:             nested_attributes_set_attributes(reflection, obj, attributes)
    252:           end
    253:         end

validate_associated_object(reflection, obj) click to toggle source

Validate the given associated object, adding any validation error messages from the given object to the parent object.

         # File lib/sequel/plugins/nested_attributes.rb, line 257
    257:         def validate_associated_object(reflection, obj)
    258:           return if reflection[:validate] == false
    259:           association = reflection[:name]
    260:           obj.errors.full_messages.each{|m| errors.add(association, m)} unless obj.valid?
    261:         end

Disabled; run with --debug to generate this.

[Validate]

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