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POIn a Rails migration, is it possible to indicate that a newly added column should be before or after an existing column in the table?
 

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  1. POIn a Rails migration, is it possible to indicate that a newly added column should be before or after an existing column in the table?
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    <p>Let's say I create a table in a Rails migration, specifying to omit the ID column:</p> <pre><code>create_table :categories_posts, :id =&gt; false do |t| t.column :category_id, :integer, :null =&gt; false t.column :post_id, :integer, :null =&gt; false end </code></pre> <p>Later I decide I want to add an ID column as a primary key so I create a new migration:</p> <pre><code>class ChangeCategoriesToRichJoin &lt; ActiveRecord::Migration def self.up add_column :categories_posts, :id, :primary_key end def self.down remove_column :categories_posts, :id end end </code></pre> <p>But when I look at the table after I migrate, it looks like this:</p> <pre><code>category_id post_id id </code></pre> <p>The id column is in the last position in the table, whereas normally an id column would be first. </p> <p>Is there a way to change the ChangeCategoriesToRichJoin migration to insist on the id column being created BEFORE the category_id column in the table?</p> <p>Or do I need to drop the table and add the column in the "create table" definition?</p>
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