Mercurial > pub > Impl
annotate Lib/IMPL/Web/Application/Resource.pm @ 280:c6d0f889ef87
+IMPL::declare now supports meta attributes
*bugfixes related to the typeof() operator
author | cin |
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date | Wed, 06 Feb 2013 02:15:48 +0400 |
parents | 4abda21186cd |
children | 546957c50a36 |
rev | line source |
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1 package IMPL::Web::Application::Resource; |
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2 use strict; |
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3 |
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4 use URI; |
230 | 5 use IMPL::Const qw(:prop); |
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6 use IMPL::declare { |
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7 require => { |
244 | 8 ViewResult => 'IMPL::Web::ViewResult', |
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9 Exception => 'IMPL::Exception', |
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10 ArgumentException => '-IMPL::InvalidArgumentException', |
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11 OperationException => '-IMPL::InvalidOperationException', |
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12 NotAllowedException => 'IMPL::Web::NotAllowedException', |
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13 NotFoundException => 'IMPL::Web::NotFoundException' |
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14 }, |
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15 base => [ |
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16 'IMPL::Object' => undef, |
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17 'IMPL::Web::Application::ResourceInterface' => undef |
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18 ], |
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19 props => [ |
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20 application => PROP_RO, |
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21 parent => PROP_RO, |
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22 model => PROP_RO, |
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23 id => PROP_RO, |
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24 contract => PROP_RO, |
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25 location => PROP_RO, |
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26 ] |
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27 }; |
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28 |
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29 sub CTOR { |
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30 my ( $this, %args ) = @_; |
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31 |
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32 die ArgumentException->new( id => 'A resource identifier is required' ) |
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33 unless $args{id}; |
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34 die ArgumentException->new( contract => 'A contract is required' ) |
255 | 35 unless $args{contract}; |
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36 |
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37 $this->parent( $args{parent} ); |
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38 $this->model( $args{model} ); |
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39 $this->id( $args{id} ); |
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40 $this->contract( $args{contract} ); |
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41 $this->application( $args{application} || ($args{parent} && $args{parent}->application) ); |
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42 |
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43 # если расположение явно не указано, то оно вычисляется автоматически, |
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44 # либо остается не заданным |
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45 $this->location( $args{location} |
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46 || eval { $this->parent->location->Child( $this->id ) } ); |
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47 } |
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48 |
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49 sub InvokeHttpVerb { |
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50 my ( $this, $verb, $action ) = @_; |
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51 |
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52 my $operation = $this->contract->verbs->{ lc($verb) }; |
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53 |
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54 die NotAllowedException->new( |
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55 allow => join( ',', map( uc, keys %{ $this->contract->verbs } ) ) ) |
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56 unless $operation; |
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57 |
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58 # в случае, когда один ресурс вызывает HTTP метод другого ресурса, нужно |
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59 # сохранить оригинальный resourceLocation |
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60 $action->context->{resourceLocation} ||= $this->location; |
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61 |
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62 return _InvokeDelegate($operation, $this, $action ); |
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63 } |
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64 |
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65 # это реализация по умолчанию, базируется информации о ресурсах, содержащийся |
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66 # в контракте. |
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67 sub FetchChildResource { |
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68 my ( $this, $childId ) = @_; |
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69 |
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70 my ( $info, $childIdParts ) = |
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71 $this->contract->FindChildResourceInfo($childId); |
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72 |
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73 die NotFoundException->new( $this->location->url, $childId ) unless $info; |
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74 |
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75 my $binding = $info->{binding}; |
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76 my $contract = $info->{contract}; |
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77 my $model = _InvokeDelegate( $binding, $this, @$childIdParts ); |
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78 |
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79 if ( ref $contract eq 'CODE' || $contract->can('Invoke')) { |
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80 $contract = _InvokeDelegate($contract,$this,$model); |
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81 $info->{contract} = $contract; |
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82 } |
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83 |
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84 die OperationException->new( "Can't fetch a contract for the resource", |
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85 $childId ) |
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86 unless $contract; |
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87 |
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88 my %args = ( |
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89 parent => $this, |
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90 id => $childId, |
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91 model => $model |
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92 ); |
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93 |
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94 return $contract->CreateResource(%args); |
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95 } |
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96 |
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97 sub _InvokeDelegate { |
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98 my $delegate = shift; |
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99 |
230 | 100 return $delegate->(@_) if ref $delegate eq 'CODE'; |
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101 return $delegate->Invoke(@_) if eval { $delegate->can('Invoke') }; |
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102 } |
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103 |
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104 1; |
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105 |
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106 __END__ |
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107 |
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108 =pod |
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109 |
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110 =head1 NAME |
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111 |
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112 C<IMPL::Web::Application::Resource> - Web-ресурс. |
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113 |
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114 =head1 SYNOPSIS |
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115 |
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116 Класс для внутреннего использования. Объединяет в себе контракт и модель данных. |
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117 Основная задача - обработать поступающий от контроллера запрос на вызов C<HTTP> |
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118 метода. |
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119 |
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120 Экземпляры данного класса передаются в качестве параметров делегатам |
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121 осуществляющим привязку к модели в C<IMPL::Web::Application::ResourceContract> |
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122 и C<IMPL::Web::Application::OperationContract>. |
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123 |
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124 =head1 DESCRIPTION |
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125 |
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126 Весь функционал ресурса, поддерживаемые им C<HTTP> методы определяются |
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127 контрактом. Однако можно реализовывать ресурсы, которые не имеют контракта |
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128 или он отличается от того, что предоставляется стандартно |
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129 C<IMPL::Web::Application::ResourceContract>. |
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130 |
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131 Каждый ресурс является контейнером, тоесть позволяет получить дочерний ресурс |
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132 по идентифифкатору, если таковой имеется, тоесть ресурс, у которого нет дочерних |
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133 ресурсов на самом деле рассматривается как пустой контейнер. |
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134 |
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135 С ресурсом непосредственно взаимодействует котроллер запросов |
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136 C<IMPL::Web::Handler::RestController>, вызывая два метода. |
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137 |
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138 =over |
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139 |
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140 =item * C<FetchChildResource($childId)> |
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141 |
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142 Данный метод возвращает дочерний ресурс, соответствующий C<$childId>. |
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143 Текущая реализация использует метод C<FindChildResourceInfo> контракта текущего |
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144 ресурса, после чего создает дочерний ресурс. |
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145 |
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146 Если дочерний ресурс не найден, вызывается исключение |
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147 C<IMPL::Web::NotFoundException>. |
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148 |
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149 =item * C<InvokeHttpVerb($verb,$action)> |
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150 |
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151 Обрабатывает запрос к ресурсу. Для этого используется контракт ресурса, в |
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152 нем выбирается соответсвующий C<IMPL::Web::Application::OperationContract>. |
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153 Затем найденный контракт для указанной операции используется для обработки |
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154 запроса. |
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155 |
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156 =back |
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157 |
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158 Если объект реализует два вышеуказанных метода, он является веб-ресурсом, а |
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159 детали его реализации, котнракт и прочее уже не важно, поэтому можно реализовать |
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160 собственный класс ресурса, например унаследованный от |
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161 C<IMPL::Web::Application::CustomResource>. |
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162 |
230 | 163 =head1 MEMBERS |
164 | |
268
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165 =head2 C<[get]application> |
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166 |
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167 Ссылка на приложение, к которому относится данный ресурс. Его следует задавать |
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168 только для коренвых ресурсов, дочерние ресурсы получают это свойство от |
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169 родителей. |
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170 |
230 | 171 =head2 C<[get]contract> |
172 | |
248 | 173 Обязательное свойство для ресурса, ссылается, на контракт, соответствующий |
230 | 174 данному ресурсу, используется для выполнения C<HTTP> методов и получения |
175 дочерних ресурсов. | |
176 | |
177 =head2 C<[get]id> | |
178 | |
179 Обязательное свойство ресурса, идентифицирует его в родительском контейнере, | |
180 для корневого ресурса может иметь произвольное значение. | |
181 | |
182 =head2 C<[get]parent> | |
183 | |
184 Ссылка на родительский ресурс, для корневого ресурса не определена. | |
185 | |
186 =head2 C<[get]model> | |
187 | |
188 Ссылка на объект предметной области, представляемый данным ресурсом. Данное | |
189 свойство не является обязательным и может быть не задано. | |
190 | |
191 =head2 C<[get]location> | |
192 | |
193 Объект типа C<IMPL::Web::AutoLocator> или аналогичный описывающий адрес текущего | |
194 ресурса, может быть как явно передан при создании ресурса, так и вычислен | |
195 автоматически (только для ресурсов имеющих родителя). Следует заметить, что | |
196 адрес ресурса не содержит параметров запроса, а только путь. | |
197 | |
268
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198 =head2 C<[get]FetchChildResource($id)> |
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199 |
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200 Возвращает дочерний ресурс, по его идентификатору. |
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201 |
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202 Данная реализация использует контракт текущего ресурса для поиска информации о |
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203 дочернем ресурсе C<< $this->contract->FindChildResourceInfo($id) >>. |
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204 |
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205 Затем осуществляется привязка к моделе, тоесть, выполняется делегат, для |
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206 получения модели дочернего ресурса, а затем осуществляется привязка к контракту, |
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207 при этом в делегат, который должен вернуть контракт дочернего ресурса передаются |
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208 текущий ресурc и модель дочернего ресурса. |
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209 |
229
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210 =cut |