ActiveRecord::Migrationを継承したクラスでcreate_tableが呼べる仕組みを教えてください Ruby on Rails`ActiveRecord::Migration``create_table` `create_table``ActiveRecord::ConnectionAdapters::SchemaStatements``create_table` `Migration``SchemaStatements`include`create_table`

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`ActiveRecord#method_missing` `ActiveRecord::ConnectionAdapters::AbstractAdapter` `create_table`

Rails 4.2.0

`method_missing`

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`connection` `ActiveRecord::ConnectionAdapters::SQLite3Adapter` `ActiveRecord::ConnectionAdapters::SchemaStatements` include `SQLite3Adapter`

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