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PO
 

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    <p>Try:</p> <pre><code>change_column :my_table, :id, :primary_key </code></pre> <p>or</p> <pre><code>my_table.change_column :id, :primary_key </code></pre> <p>Certain Rails database adapters may not let you call <code>change_column</code> on the primary key. If that is the case then you can always call <code>execute</code> to perform the change using SQL directly:</p> <p>MySQL:</p> <pre><code>execute('ALTER TABLE "my_table" CHANGE "id" "id" bigint DEFAULT NULL auto_increment PRIMARY KEY') </code></pre> <p>PostgreSQL (method 1):</p> <pre><code>max_id = execute(%%Q{SELECT id FROM "my_table" ORDER BY "id" DESC LIMIT 1}).to_a.first execute(%%Q{CREATE SEQUENCE "my_table_id_seq" START #{max_id+1}}) execute(%%Q{ALTER TABLE "my_table" ALTER COLUMN "id" TYPE bigint}) execute(%%Q{ALTER TABLE "my_table" ALTER COLUMN "id" SET DEFAULT nextval('my_table_id_seq'::regclass)}) execute(%%Q{ALTER TABLE "my_table" ADD PRIMARY KEY("id")}) </code></pre> <p>PostgreSQL (method 2):</p> <pre><code>max_id = execute(%%Q{SELECT "id" FROM "my_table" ORDER BY "id" DESC LIMIT 1}).to_a.first execute(%%Q{ALTER TABLE "my_table" RENAME COLUMN "id" TO "id_orig"}) execute(%%Q{ALTER TABLE "my_table" ADD COLUMN "id" bigserial NOT NULL}) execute(%%Q{UPDATE "my_table" SET "id"="id_orig"}) execute(%%Q{ALTER SEQUENCE "my_table_id_seq" RESTART #{max_id+1}}) execute(%%Q{ALTER TABLE "my_table" DROP COLUMN "id_orig"}) </code></pre> <p>If you do not want to use <code>bigint</code>/<code>bigserial</code> (64-bit), use <code>int(11)</code>/<code>integer</code>/<code>serial</code> instead.</p>
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    1. POAdd auto increment back to primary key column in Rails
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    1. USTim Cooper
    1. USvladr
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    1. COThnx for yor response,But i have actually already done change_column on some of the primary keys.May be thats why it removed the already existing Auto Increment option from the primary key option.
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    2. CONo problem. See my update.
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