Class: SchemaPlus::Core::SchemaDump

Inherits:
Object
  • Object
show all
Includes:
TSort
Defined in:
lib/schema_plus/core/schema_dump.rb

Defined Under Namespace

Classes: Table

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(dumper) ⇒ SchemaDump

Returns a new instance of SchemaDump.



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# File 'lib/schema_plus/core/schema_dump.rb', line 9

def initialize(dumper)
  @dumper = dumper
  @dependencies = Hash.new { |h, k| h[k] = [] }
  @initial = []
  @tables = {}
  @final = []
  @data = OpenStruct.new # a place for middleware to leave data
end

Instance Attribute Details

#data ⇒ Object (readonly)

Returns the value of attribute data.



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# File 'lib/schema_plus/core/schema_dump.rb', line 6

def data
  @data
end

#dependencies ⇒ Object (readonly)

Returns the value of attribute dependencies.



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# File 'lib/schema_plus/core/schema_dump.rb', line 6

def dependencies
  @dependencies
end

#final ⇒ Object

Returns the value of attribute final.



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# File 'lib/schema_plus/core/schema_dump.rb', line 7

def final
  @final
end

#initial ⇒ Object (readonly)

Returns the value of attribute initial.



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# File 'lib/schema_plus/core/schema_dump.rb', line 6

def initial
  @initial
end

#tables ⇒ Object (readonly)

Returns the value of attribute tables.



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# File 'lib/schema_plus/core/schema_dump.rb', line 6

def tables
  @tables
end

#trailer ⇒ Object

Returns the value of attribute trailer.



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# File 'lib/schema_plus/core/schema_dump.rb', line 7

def trailer
  @trailer
end

Instance Method Details

#assemble(stream) ⇒ Object 



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# File 'lib/schema_plus/core/schema_dump.rb', line 23

def assemble(stream)
  stream.puts @initial.join("\n") if initial.any?
  assemble_tables(stream)
  final.each do |statement|
    stream.puts "  #{statement}"
  end
  stream.puts @trailer
end

#assemble_tables(stream) ⇒ Object 



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# File 'lib/schema_plus/core/schema_dump.rb', line 32

def assemble_tables(stream)
  tsort().each do |table|
    @tables[table].assemble(stream) if @tables[table]
  end
end

#depends(tablename, dependents) ⇒ Object 



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# File 'lib/schema_plus/core/schema_dump.rb', line 18

def depends(tablename, dependents)
  @tables[tablename] ||= false # placeholder for dependencies applied before defining the table
  @dependencies[tablename] += Array.wrap(dependents)
end

#tsort_each_child(tablename, &block) ⇒ Object 



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# File 'lib/schema_plus/core/schema_dump.rb', line 42

def tsort_each_child(tablename, &block)
  @dependencies[tablename].sort.uniq.reject{|t| @dumper.ignored? t}.each(&block)
end

#tsort_each_node(&block) ⇒ Object 



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# File 'lib/schema_plus/core/schema_dump.rb', line 38

def tsort_each_node(&block)
  @tables.keys.sort.each(&block)
end