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8  <title>Module: FileColumnHelper</title>
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45<body>
46
47
48
49    <div id="classHeader">
50        <table class="header-table">
51        <tr class="top-aligned-row">
52          <td><strong>Module</strong></td>
53          <td class="class-name-in-header">FileColumnHelper</td>
54        </tr>
55        <tr class="top-aligned-row">
56            <td><strong>In:</strong></td>
57            <td>
58                <a href="../files/lib/file_column_helper_rb.html">
59                lib/file_column_helper.rb
60                </a>
61        <br />
62            </td>
63        </tr>
64
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66    </div>
67  <!-- banner header -->
68
69  <div id="bodyContent">
70
71
72
73  <div id="contextContent">
74
75    <div id="description">
76      <p>
77This module contains helper methods for displaying and uploading files for
78attributes created by <tt>FileColumn</tt>&#8217;s <tt>file_column</tt>
79method. It will be automatically included into ActionView::Base, thereby
80making this module&#8217;s methods available in all your views.
81</p>
82
83    </div>
84
85
86   </div>
87
88    <div id="method-list">
89      <h3 class="section-bar">Methods</h3>
90
91      <div class="name-list">
92      <a href="#M000001">file_column_field</a>&nbsp;&nbsp;
93      <a href="#M000002">url_for_file_column</a>&nbsp;&nbsp;
94      </div>
95    </div>
96
97  </div>
98
99
100    <!-- if includes -->
101
102    <div id="section">
103
104
105
106
107
108     
109
110
111    <!-- if method_list -->
112    <div id="methods">
113      <h3 class="section-bar">Public Instance methods</h3>
114
115      <div id="method-M000001" class="method-detail">
116        <a name="M000001"></a>
117
118        <div class="method-heading">
119          <a href="FileColumnHelper.src/M000001.html" target="Code" class="method-signature"
120            onclick="popupCode('FileColumnHelper.src/M000001.html');return false;">
121          <span class="method-name">file_column_field</span><span class="method-args">(object, method, options={})</span>
122          </a>
123        </div>
124     
125        <div class="method-description">
126          <p>
127Use this helper to create an upload field for a file_column attribute. This
128will generate an additional hidden field to keep uploaded files during
129form-redisplays. For example, when called with
130</p>
131<pre>
132  &lt;%= file_column_field(&quot;entry&quot;, &quot;image&quot;) %&gt;
133</pre>
134<p>
135the following HTML will be generated (assuming the form is redisplayed and
136something has already been uploaded):
137</p>
138<pre>
139  &lt;input type=&quot;hidden&quot; name=&quot;entry[image_temp]&quot; value=&quot;...&quot; /&gt;
140  &lt;input type=&quot;file&quot; name=&quot;entry[image]&quot; /&gt;
141</pre>
142<p>
143You can use the <tt>option</tt> argument to pass additional options to the
144file-field tag.
145</p>
146<p>
147Be sure to set the enclosing form&#8217;s encoding to
148&#8216;multipart/form-data&#8217;, by using something like this:
149</p>
150<pre>
151   &lt;%= form_tag {:action =&gt; &quot;create&quot;, ...}, :multipart =&gt; true %&gt;
152</pre>
153        </div>
154      </div>
155
156      <div id="method-M000002" class="method-detail">
157        <a name="M000002"></a>
158
159        <div class="method-heading">
160          <a href="FileColumnHelper.src/M000002.html" target="Code" class="method-signature"
161            onclick="popupCode('FileColumnHelper.src/M000002.html');return false;">
162          <span class="method-name">url_for_file_column</span><span class="method-args">(object_name, method, suffix=nil)</span>
163          </a>
164        </div>
165     
166        <div class="method-description">
167          <p>
168Creates an URL where an uploaded file can be accessed. When called for an
169Entry object with id 42 (stored in <tt>@entry</tt>) like this
170</p>
171<pre>
172  &lt;%= url_for_file_column(&quot;entry&quot;, &quot;image&quot;)
173</pre>
174<p>
175the following URL will be produced, assuming the file &quot;test.png&quot;
176has been stored in the &quot;image&quot;-column of an Entry object stored
177in <tt>@entry</tt>:
178</p>
179<pre>
180 /entry/image/42/test.png
181</pre>
182<p>
183This will produce a valid URL even for temporary uploaded files, e.g. files
184where the object they are belonging to has not been saved in the database
185yet.
186</p>
187<p>
188If there is currently no uploaded file stored in the object&#8217;s column
189this method will return <tt>nil</tt>.
190</p>
191<p>
192If the optional <tt>suffix</tt> parameter is given, it will be inserted
193into the filename before the extension. So if the uploaded file is name
194&quot;vancouver.jpg&quot; and you have the following code in your view
195</p>
196<pre>
197   &lt;%= url_for_file_column(&quot;entry&quot;, &quot;image&quot;, &quot;thumb&quot;) %&gt;
198</pre>
199<p>
200the resulting URL&#8217;s would point to a file
201&quot;vancouver-thumb.jpg&quot;. This can be used to access different
202versions of a file as produced by <a
203href="FileColumn/Magick.html">FileColumn::Magick</a>, for example.
204</p>
205<p>
206Note that the object has to be stored in an instance variable. So if
207<tt>object_name</tt> is &quot;entry&quot; your object has to be stored in
208<tt>@entry</tt>.
209</p>
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212
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215
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