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POrails add_column with default value but the default value don't take effect
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  1. POrails add_column with default value but the default value don't take effect
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    copied!<p>My rails version is 3.2.8 and use the default database. This is my migration code:</p> <pre><code>class AddQuantityToLineItem &lt; ActiveRecord::Migration def change add_column :line_items, :quantity, :integer,:default=&gt;1 end end </code></pre> <p><a href="https://stackoverflow.com/questions/4012871/how-do-default-0-and-null-false-differ-for-integer-fields-in-migrations">I find a explaination about :default option here </a>and as it said,when i create a new LineItem ,it should have a default quantity=1,but here is what i get from rails console:</p> <pre><code>lineb=LineItem.new #&lt;LineItem id: nil, product_id: nil, cart_id: nil, created_at: nil, updated_at: nil, quantity: nil&gt; </code></pre> <blockquote> <p>And when i get LineItem from the database,the quantity field is nil too.</p> </blockquote> <p>And here is the db/schema.rb :</p> <pre><code>ActiveRecord::Schema.define(:version =&gt; 20121008065102) do create_table "carts", :force =&gt; true do |t| t.datetime "created_at", :null =&gt; false t.datetime "updated_at", :null =&gt; false end create_table "line_items", :force =&gt; true do |t| t.integer "product_id" t.integer "cart_id" t.datetime "created_at", :null =&gt; false t.datetime "updated_at", :null =&gt; false t.integer "quantity" end create_table "products", :force =&gt; true do |t| t.string "title" t.text "description" t.string "image_url" t.decimal "price", :precision =&gt; 8, :scale =&gt; 2 t.datetime "created_at", :null =&gt; false t.datetime "updated_at", :null =&gt; false end end </code></pre>
 

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