Module: RailsSqlViews::SchemaDumper

Defined in:
lib/rails_sql_views/schema_dumper.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/rails_sql_views/schema_dumper.rb', line 3

def self.included(base)
  base.alias_method_chain :trailer, :views
  base.alias_method_chain :dump, :views
  base.alias_method_chain :tables, :views_excluded
  
  # A list of views which should not be dumped to the schema. 
  # Acceptable values are strings as well as regexp.
  # This setting is only used if ActiveRecord::Base.schema_format == :ruby
  base.cattr_accessor :ignore_views
  base.ignore_views = []
  # Optional: specify the order that in which views are created.
  # This allows views to depend on and include fields from other views.
  # It is not necessary to specify all the view names, just the ones that 
  # need to be created first
  base.cattr_accessor :view_creation_order
  base.view_creation_order = []
end

Instance Method Details

#dump_with_views(stream) ⇒ Object

Add views to the end of the dump stream



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# File 'lib/rails_sql_views/schema_dumper.rb', line 26

def dump_with_views(stream)
  dump_without_views(stream)
  begin
    @connection.class.send(:public, :supports_views?) # this is a kluge, but I don't know why it's changing back to private before it gets here
    if @connection.supports_views?
      views(stream)
    end
  rescue => e
    if ActiveRecord::Base.logger
      ActiveRecord::Base.logger.error "Unable to dump views: #{e}"
    else
      raise e
    end
  end
  trailer_without_views(stream)
  stream
end

#tables_with_views_excluded(stream) ⇒ Object 



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# File 'lib/rails_sql_views/schema_dumper.rb', line 98

def tables_with_views_excluded(stream)
  @connection.base_tables.sort.each do |tbl|
    next if [ActiveRecord::Migrator.schema_migrations_table_name, ignore_tables].flatten.any? do |ignored|
      case ignored
      when String then tbl == ignored
      when Regexp then tbl =~ ignored
      else
        raise StandardError, 'ActiveRecord::SchemaDumper.ignore_tables accepts an array of String and / or Regexp values.'
      end
    end
    table(tbl, stream)
  end
end

#trailer_with_views(stream) ⇒ Object 



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# File 'lib/rails_sql_views/schema_dumper.rb', line 21

def trailer_with_views(stream)
  # do nothing...we'll call this later
end

#view(view, stream) ⇒ Object

Add the specified view to the stream



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# File 'lib/rails_sql_views/schema_dumper.rb', line 69

def view(view, stream)
  columns = @connection.columns(view).collect { |c| c.name }
  begin
    v = StringIO.new

    v.print "  create_view #{view.inspect}"
    v.print ", #{@connection.view_select_statement(view).dump}"
    v.print ", :force => true"
    v.puts " do |v|"

    columns.each do |column|
      v.print "    v.column :#{column}"
      v.puts
    end

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

#views(stream) ⇒ Object

Add views to the stream



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# File 'lib/rails_sql_views/schema_dumper.rb', line 45

def views(stream)
  if view_creation_order.empty?
    sorted_views = @connection.views.sort
  else
    # set union, merge by joining arrays, removing dups
    # this will float the view name sin view_creation_order to the top
    # without requiring all the views to be specified
    sorted_views = view_creation_order | @connection.views
  end
  sorted_views.each do |v|
    next if [ActiveRecord::Migrator.schema_migrations_table_name, ignore_views].flatten.any? do |ignored|
      case ignored
      when String then v == ignored
      when Symbol then v == ignored.to_s
      when Regexp then v =~ ignored
      else
        raise StandardError, 'ActiveRecord::SchemaDumper.ignore_views accepts an array of String and / or Regexp values.'
      end
    end 
    view(v, stream)
  end
end