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<title>validates_uniqueness_of (ActiveRecord::Validations::ClassMethods)</title>
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<pre><span class="ruby-comment cmt"># File lib/active_record/validations.rb, line 773</span>
<span class="ruby-keyword kw">def</span> <span class="ruby-identifier">validates_uniqueness_of</span>(<span class="ruby-operator">*</span><span class="ruby-identifier">attr_names</span>)
<span class="ruby-identifier">configuration</span> = { <span class="ruby-identifier">:case_sensitive</span> =<span class="ruby-operator">></span> <span class="ruby-keyword kw">true</span> }
<span class="ruby-identifier">configuration</span>.<span class="ruby-identifier">update</span>(<span class="ruby-identifier">attr_names</span>.<span class="ruby-identifier">extract_options!</span>)
<span class="ruby-identifier">validates_each</span>(<span class="ruby-identifier">attr_names</span>,<span class="ruby-identifier">configuration</span>) <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">record</span>, <span class="ruby-identifier">attr_name</span>, <span class="ruby-identifier">value</span><span class="ruby-operator">|</span>
<span class="ruby-comment cmt"># The check for an existing value should be run from a class that</span>
<span class="ruby-comment cmt"># isn't abstract. This means working down from the current class</span>
<span class="ruby-comment cmt"># (self), to the first non-abstract class. Since classes don't know</span>
<span class="ruby-comment cmt"># their subclasses, we have to build the hierarchy between self and</span>
<span class="ruby-comment cmt"># the record's class.</span>
<span class="ruby-identifier">class_hierarchy</span> = [<span class="ruby-identifier">record</span>.<span class="ruby-identifier">class</span>]
<span class="ruby-keyword kw">while</span> <span class="ruby-identifier">class_hierarchy</span>.<span class="ruby-identifier">first</span> <span class="ruby-operator">!=</span> <span class="ruby-keyword kw">self</span>
<span class="ruby-identifier">class_hierarchy</span>.<span class="ruby-identifier">insert</span>(<span class="ruby-value">0</span>, <span class="ruby-identifier">class_hierarchy</span>.<span class="ruby-identifier">first</span>.<span class="ruby-identifier">superclass</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-comment cmt"># Now we can work our way down the tree to the first non-abstract</span>
<span class="ruby-comment cmt"># class (which has a database table to query from).</span>
<span class="ruby-identifier">finder_class</span> = <span class="ruby-identifier">class_hierarchy</span>.<span class="ruby-identifier">detect</span> { <span class="ruby-operator">|</span><span class="ruby-identifier">klass</span><span class="ruby-operator">|</span> <span class="ruby-operator">!</span><span class="ruby-identifier">klass</span>.<span class="ruby-identifier">abstract_class?</span> }
<span class="ruby-identifier">column</span> = <span class="ruby-identifier">finder_class</span>.<span class="ruby-identifier">columns_hash</span>[<span class="ruby-identifier">attr_name</span>.<span class="ruby-identifier">to_s</span>]
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span>.<span class="ruby-identifier">nil?</span>
<span class="ruby-identifier">comparison_operator</span> = <span class="ruby-value str">"IS ?"</span>
<span class="ruby-keyword kw">elsif</span> <span class="ruby-identifier">column</span>.<span class="ruby-identifier">text?</span>
<span class="ruby-identifier">comparison_operator</span> = <span class="ruby-node">"#{connection.case_sensitive_equality_operator} ?"</span>
<span class="ruby-identifier">value</span> = <span class="ruby-identifier">column</span>.<span class="ruby-identifier">limit</span> <span class="ruby-value">? </span><span class="ruby-identifier">value</span>.<span class="ruby-identifier">to_s</span>.<span class="ruby-identifier">mb_chars</span>[<span class="ruby-value">0</span>, <span class="ruby-identifier">column</span>.<span class="ruby-identifier">limit</span>] <span class="ruby-operator">:</span> <span class="ruby-identifier">value</span>.<span class="ruby-identifier">to_s</span>
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">comparison_operator</span> = <span class="ruby-value str">"= ?"</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">sql_attribute</span> = <span class="ruby-node">"#{record.class.quoted_table_name}.#{connection.quote_column_name(attr_name)}"</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">value</span>.<span class="ruby-identifier">nil?</span> <span class="ruby-operator">||</span> (<span class="ruby-identifier">configuration</span>[<span class="ruby-identifier">:case_sensitive</span>] <span class="ruby-operator">||</span> <span class="ruby-operator">!</span><span class="ruby-identifier">column</span>.<span class="ruby-identifier">text?</span>)
<span class="ruby-identifier">condition_sql</span> = <span class="ruby-node">"#{sql_attribute} #{comparison_operator}"</span>
<span class="ruby-identifier">condition_params</span> = [<span class="ruby-identifier">value</span>]
<span class="ruby-keyword kw">else</span>
<span class="ruby-identifier">condition_sql</span> = <span class="ruby-node">"LOWER(#{sql_attribute}) #{comparison_operator}"</span>
<span class="ruby-identifier">condition_params</span> = [<span class="ruby-identifier">value</span>.<span class="ruby-identifier">mb_chars</span>.<span class="ruby-identifier">downcase</span>]
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">scope</span> = <span class="ruby-identifier">configuration</span>[<span class="ruby-identifier">:scope</span>]
<span class="ruby-constant">Array</span>(<span class="ruby-identifier">scope</span>).<span class="ruby-identifier">map</span> <span class="ruby-keyword kw">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">scope_item</span><span class="ruby-operator">|</span>
<span class="ruby-identifier">scope_value</span> = <span class="ruby-identifier">record</span>.<span class="ruby-identifier">send</span>(<span class="ruby-identifier">scope_item</span>)
<span class="ruby-identifier">condition_sql</span> <span class="ruby-operator"><<</span> <span class="ruby-value str">" AND "</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">attribute_condition</span>(<span class="ruby-node">"#{record.class.quoted_table_name}.#{scope_item}"</span>, <span class="ruby-identifier">scope_value</span>)
<span class="ruby-identifier">condition_params</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">scope_value</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">unless</span> <span class="ruby-identifier">record</span>.<span class="ruby-identifier">new_record?</span>
<span class="ruby-identifier">condition_sql</span> <span class="ruby-operator"><<</span> <span class="ruby-node">" AND #{record.class.quoted_table_name}.#{record.class.primary_key} <> ?"</span>
<span class="ruby-identifier">condition_params</span> <span class="ruby-operator"><<</span> <span class="ruby-identifier">record</span>.<span class="ruby-identifier">send</span>(<span class="ruby-identifier">:id</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-identifier">finder_class</span>.<span class="ruby-identifier">with_exclusive_scope</span> <span class="ruby-keyword kw">do</span>
<span class="ruby-keyword kw">if</span> <span class="ruby-identifier">finder_class</span>.<span class="ruby-identifier">exists?</span>([<span class="ruby-identifier">condition_sql</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">condition_params</span>])
<span class="ruby-identifier">record</span>.<span class="ruby-identifier">errors</span>.<span class="ruby-identifier">add</span>(<span class="ruby-identifier">attr_name</span>, <span class="ruby-identifier">:taken</span>, <span class="ruby-identifier">:default</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">configuration</span>[<span class="ruby-identifier">:message</span>], <span class="ruby-identifier">:value</span> =<span class="ruby-operator">></span> <span class="ruby-identifier">value</span>)
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span>
<span class="ruby-keyword kw">end</span></pre>
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distrib
>
Mandriva
>
2010.0
>
i586
>
media
>
contrib-release
>
by-pkgid
>
d51872cc0e1fdee944d71993f94ac764
>
files
>
790
