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PORails: Use reload! in controller
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  1. PORails: Use reload! in controller
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    copied!<p>I'm creating a rails code that could add/remove field of a model. </p> <p>I've a model Inventory, where I could add a list of fields as below:</p> <pre><code>def update_new_fields @fieldnames = params["fieldnames"] @fieldnames.each do |fieldname| ActiveRecord::Migration.add_column(Inventory, fieldname, :string) end end </code></pre> <p>To view list of updated fields</p> <pre><code>def index reload! @fields=Inventory.attribute_names respond_to do |format| format.html end end </code></pre> <p>However, I've got the following error:</p> <pre><code>undefined method `reload!' for #&lt;InventoriesController:0x007fccf70b7720&gt; </code></pre> <p>If I did a reload! in console:</p> <pre><code>2.0.0 :163 &gt; ActiveRecord::Migration.remove_column(Inventory, "f", :string) -- remove_column(Inventory(id: integer, name: string, description: string, quatity: integer, created_at: datetime, updated_at: datetime, a: string, b: string, c: string, e: string, f: string), "f", :string) (122.9ms) ALTER TABLE `inventories` DROP `f` -&gt; 0.1232s =&gt; nil 2.0.0 :164 &gt; Inventory.reset_column_information =&gt; nil 2.0.0 :165 &gt; Inventory.attribute_names =&gt; ["id", "name", "description", "quatity", "created_at", "updated_at", "a", "b", "c", "e", "f"] 2.0.0 :166 &gt; reload! Reloading... =&gt; true 2.0.0 :167 &gt; Inventory.attribute_names =&gt; ["id", "name", "description", "quatity", "created_at", "updated_at", "a", "b", "c", "e"] </code></pre> <p>It works.</p> <p><strong>UPD</strong></p> <p>What I've find out is, after foing a "Inventory.reset_column_information", the attribute_names were not updated but the Class information is:</p> <pre><code>2.0.0 :090 &gt; Inventory.reset_column_information =&gt; nil 2.0.0 :091 &gt; Inventory.attribute_names =&gt; ["id", "name", "description", "quatity", "created_at", "updated_at", "hello", "next"] 2.0.0 :092 &gt; Inventory =&gt; Inventory(id: integer, name: string, description: string, quatity: integer, created_at: datetime, updated_at: datetime, a: string, b: string, c: string, d: string) </code></pre> <p>So, the work around I did was:</p> <pre><code>def index Inventory.reset_column_information tmp = Inventory.new @fields=tmp.attribute_names respond_to do |format| format.html end end </code></pre> <p>And finally my field in Inventory is updated.</p>
 

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