Rails架构创建问题

时间:2008-12-20 07:26:16

标签: ruby-on-rails jruby migration activerecord-jdbc

我正在使用Jruby和rails 2.2.2。我的问题是我的迁移未正确写入数据库模式。

这是我的迁移:

class CreateNotes < ActiveRecord::Migration
  def self.up
    create_table(:notes, :options => 'ENGINE=MyISAM') do |t|
      t.string :title
      t.text :body

      t.timestamps
    end

    execute "alter table notes ADD FULLTEXT(title, body)"

end

以下是schema.rb中生成的内容

create_table "notes", :force => true do |t|
  t.string   "title"
  t.text     "body"
  t.datetime "created_at"
  t.datetime "updated_at"
end

add_index "notes", ["title", "body"], :name => "title"

我有两个问题:

  • 如何将'ENGINE=MyISAM'纳入架构?
  • 为什么我的执行语句变为add_index "notes", ["title", "body"], :name => "title"?以及如何强制迁移将其作为执行语句保留?

感谢Christian Lescuyer的回答。但是,当我尝试这个没有改变。我取消注释了config.active_record ...行,但我的架构没有改变。我已经尝试了jruby和ruby 1.8.6上的rails 2.2.2和edge rails,架构没有变化。谁能告诉我我做错了什么?

6 个答案:

答案 0 :(得分:10)

一旦我设置了

,我也希望在“rake db:migrate”之后看到一个新的.sql文件出现
config.active_record.schema_format = :sql

在config / environment.rb中。

然而,显然这不是它的工作方式。我必须明确地执行此操作以获取db / [development | test | production] _structure.sql文件:

rake db:structure:dump

答案 1 :(得分:8)

当我使用外键约束时,我使用SQL格式进行迁移。在 environment.rb

# Use SQL instead of Active Record's schema dumper when creating the test database.
# This is necessary if your schema can't be completely dumped by the schema dumper,
# like if you have constraints or database-specific column types
config.active_record.schema_format = :sql

答案 2 :(得分:6)

只是对Rails 3(目前为测试版4)的更新 - Christian的解决方案仍然正确,只有正确的位置放在config/application.rb的{​​{1}}范围内Application应该在以Rails项目命名的模块中定义的类。

答案 3 :(得分:1)

基督徒是对的。

config.active_record.schema_format =:sql

在environment.rb

但是您必须使用不同的架构转储格式和文件位置。尝试进行迁移并查找“schema.sql”而不是scehema.rb

所有这一切的原因是方案文件的要点是非特定的数据库(适用于所有类型的数据库)文件。因此,当您使用仅通过unsupoorted execute语句在mysql上运行的功能时,不能将它们置于schema.rb中

答案 4 :(得分:1)

要使用SQL变体进行测试(而不是schema.rb),您需要使用

  

rake db:test:clone_structure

我们的架构使用UUID(uuid gem)和Red Hill on Rails(RHoR)不错的FK插件。不幸的是,FK需要只能在迁移中使用EXECUTES添加的PK。

众所周知,这些执行不会进入schema.rb;然而,更难找到db的替代方案:test:为不能使用schema.rb的应用做准备。

答案 5 :(得分:1)

以下monkeypatch解决了模式转储器(Rails 3.2)的FULLTEXT索引问题和数据库引擎选项。您可以将其放入config/initializers/(例如schema_dumper_monkeypatch.rb):

module ActiveRecord
  class SchemaDumper
    def table(table, stream)
      columns = @connection.columns(table)
      begin
        tbl = StringIO.new

        # first dump primary key column
        if @connection.respond_to?(:pk_and_sequence_for)
          pk, _ = @connection.pk_and_sequence_for(table)
        elsif @connection.respond_to?(:primary_key)
          pk = @connection.primary_key(table)
        end

        tbl.print "  create_table #{remove_prefix_and_suffix(table).inspect}"
        if columns.detect { |c| c.name == pk }
          if pk != 'id'
            tbl.print %Q(, :primary_key => "#{pk}")
          end
        else
          tbl.print ", :id => false"
        end
        tbl.print ", :force => true"

        # Add table engine
        res = @connection.execute "SHOW TABLE STATUS LIKE '#{table}'"
        engine = res.first[res.fields.index("Engine")] rescue nil
        tbl.print ", :options => 'ENGINE=#{engine}'" if engine
        res = nil # Free the result        

        tbl.puts " do |t|"

        # then dump all non-primary key columns
        column_specs = columns.map do |column|
          raise StandardError, "Unknown type '#{column.sql_type}' for column '#{column.name}'" if @types[column.type].nil?
          next if column.name == pk
          spec = {}
          spec[:name]      = column.name.inspect

          # AR has an optimization which handles zero-scale decimals as integers. This
          # code ensures that the dumper still dumps the column as a decimal.
          spec[:type]      = if column.type == :integer && [/^numeric/, /^decimal/].any? { |e| e.match(column.sql_type) }
                               'decimal'
                             else
                               column.type.to_s
                             end
          spec[:limit]     = column.limit.inspect if column.limit != @types[column.type][:limit] && spec[:type] != 'decimal'
          spec[:precision] = column.precision.inspect if column.precision
          spec[:scale]     = column.scale.inspect if column.scale
          spec[:null]      = 'false' unless column.null
          spec[:default]   = default_string(column.default) if column.has_default?
          (spec.keys - [:name, :type]).each{ |k| spec[k].insert(0, "#{k.inspect} => ")}
          spec
        end.compact

        # find all migration keys used in this table
        keys = [:name, :limit, :precision, :scale, :default, :null] & column_specs.map{ |k| k.keys }.flatten

        # figure out the lengths for each column based on above keys
        lengths = keys.map{ |key| column_specs.map{ |spec| spec[key] ? spec[key].length + 2 : 0 }.max }

        # the string we're going to sprintf our values against, with standardized column widths
        format_string = lengths.map{ |len| "%-#{len}s" }

        # find the max length for the 'type' column, which is special
        type_length = column_specs.map{ |column| column[:type].length }.max

        # add column type definition to our format string
        format_string.unshift "    t.%-#{type_length}s "

        format_string *= ''

        column_specs.each do |colspec|
          values = keys.zip(lengths).map{ |key, len| colspec.key?(key) ? colspec[key] + ", " : " " * len }
          values.unshift colspec[:type]
          tbl.print((format_string % values).gsub(/,\s*$/, ''))
          tbl.puts
        end

        tbl.puts "  end"
        tbl.puts

        indexes(table, tbl)

        tbl.rewind
        stream.print tbl.read
      rescue => e
        stream.puts "# Could not dump table #{table.inspect} because of following #{e.class}"
        stream.puts "#   #{e.message}"
        stream.puts
      end

      stream
    end    

    def indexes(table, stream)
      if (indexes = @connection.indexes(table)).any?
        add_index_statements = indexes.map do |index|

          if index.name =~ /fulltext/i
            "  execute \"CREATE FULLTEXT INDEX #{index.name} ON #{index.table} (#{index.columns.join(',')})\""
          elsif index.name =~ /spatial/i
            "  execute \"CREATE SPATIAL INDEX #{index.name} ON #{index.table} (#{index.columns.join(',')})\""
          else
            statement_parts = [
              ('add_index ' + remove_prefix_and_suffix(index.table).inspect),
              index.columns.inspect,
              (':name => ' + index.name.inspect),
            ]
            statement_parts << ':unique => true' if index.unique

            index_lengths = (index.lengths || []).compact
            statement_parts << (':length => ' + Hash[index.columns.zip(index.lengths)].inspect) unless index_lengths.empty?

            index_orders = (index.orders || {})
            statement_parts << (':order => ' + index.orders.inspect) unless index_orders.empty?

            '  ' + statement_parts.join(', ')
          end
        end

        stream.puts add_index_statements.sort.join("\n")
        stream.puts
      end
    end
  end
end