59 lines
1.8 KiB
Ruby
59 lines
1.8 KiB
Ruby
module ActiveRecord
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# Allows programmers to programmatically define a schema in a portable
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# DSL. This means you can define tables, indexes, etc. without using SQL
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# directly, so your applications can more easily support multiple
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# databases.
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#
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# Usage:
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#
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# ActiveRecord::Schema.define do
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# create_table :authors do |t|
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# t.column :name, :string, :null => false
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# end
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#
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# add_index :authors, :name, :unique
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#
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# create_table :posts do |t|
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# t.column :author_id, :integer, :null => false
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# t.column :subject, :string
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# t.column :body, :text
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# t.column :private, :boolean, :default => false
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# end
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#
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# add_index :posts, :author_id
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# end
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#
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# ActiveRecord::Schema is only supported by database adapters that also
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# support migrations, the two features being very similar.
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class Schema < Migration
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private_class_method :new
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# Eval the given block. All methods available to the current connection
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# adapter are available within the block, so you can easily use the
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# database definition DSL to build up your schema (#create_table,
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# #add_index, etc.).
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#
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# The +info+ hash is optional, and if given is used to define metadata
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# about the current schema (like the schema's version):
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#
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# ActiveRecord::Schema.define(:version => 15) do
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# ...
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# end
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def self.define(info={}, &block)
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instance_eval(&block)
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unless info.empty?
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initialize_schema_information
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cols = columns('schema_info')
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info = info.map do |k,v|
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v = Base.connection.quote(v, cols.detect { |c| c.name == k.to_s })
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"#{k} = #{v}"
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end
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Base.connection.update "UPDATE #{Migrator.schema_info_table_name} SET #{info.join(", ")}"
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end
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end
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end
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end
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