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PORails Migrations: tried to change the type of column from string to integer
 

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  1. PORails Migrations: tried to change the type of column from string to integer
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    <p>I created a table in my rails app with rails generate migrations command. Here is that migration file:</p> <pre><code>class CreateListings &lt; ActiveRecord::Migration def change create_table :listings do |t| t.string :name t.string :telephone t.string :latitude t.string :longitude t.timestamps end end end </code></pre> <p>Then I wanted to store the latitude and longitude as integers so I tried to run:</p> <pre><code>rails generate migration changeColumnType </code></pre> <p>and the contents of that file are:</p> <pre><code>class ChangeColumnType &lt; ActiveRecord::Migration def up #change latitude columntype from string to integertype change_column :listings, :latitude, :integer change_column :listings, :longitude, :integer #change longitude columntype from string to integer type end def down end end </code></pre> <p>I was expecting the column type to change however the rake was aborted and the following error message appeared. I was wondering why this did not go through? Im using postgresql in my app.</p> <pre><code>rake db:migrate == ChangeColumnType: migrating =============================================== -- change_column(:listings, :latitude, :integer) rake aborted! An error has occurred, this and all later migrations canceled: PG::Error: ERROR: column "latitude" cannot be cast to type integer : ALTER TABLE "listings" ALTER COLUMN "latitude" TYPE integer Tasks: TOP =&gt; db:migrate (See full trace by running task with --trace) </code></pre> <p>NOTE: The table has no DATA. Thanks</p>
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    1. This table or related slice is empty.
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    1. USErwin Brandstetter
    1. USbanditKing
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      1. PORails Migrations: tried to change the type of column from string to integer
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      1. PORails Migrations: tried to change the type of column from string to integer
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    1. COEnsure you have no data on it and you could try make a rollback
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      1. PORails Migrations: tried to change the type of column from string to integer
      1. USIsmael Abreu
    2. COIf there's no data you can simply remove the columns and re-add them with the correct type. A whole degree of lat/long is pretty big so you might want to think about what type you really want for those columns.
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      1. USmu is too short
 

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