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Set the record straight on the purpose and utility of db/schema.rb

git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@8124 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
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commit 0f2c6302a19abce498d6cdbd44df0131c51fc8a3 1 parent 2e12afa
David Heinemeier Hansson authored
11  activerecord/lib/active_record/schema_dumper.rb
@@ -37,9 +37,16 @@ def header(stream)
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         define_params = @info ? ":version => #{@info['version']}" : ""
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         stream.puts <<HEADER
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-# This file is autogenerated. Instead of editing this file, please use the
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-# migrations feature of ActiveRecord to incrementally modify your database, and
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+# This file is auto-generated from the current state of the database. Instead of editing this file, 
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+# please use the migrations feature of ActiveRecord to incrementally modify your database, and
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 # then regenerate this schema definition.
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+#
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+# Note that this schema.rb definition is the authoritative source for your database schema. If you need
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+# to create the application database on another system, you should be using db:schema:load, not running
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+# all the migrations from scratch. The latter is a flawed and unsustainable approach (the more migrations
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+# you'll amass, the slower it'll run and the greater likelihood for issues).
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+#
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+# It's strongly recommended to check this file into your version control system.
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 ActiveRecord::Schema.define(#{define_params}) do
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