### Home Classes Methods

### In Files

- lib/sequel/extensions/to_dot.rb

### Parent

Object

### Methods

- ::new
- ::output
- #dot
- #output
- #v

### Files

- CHANGELOG
- MIT-LICENSE
- README.rdoc
- active_record.rdoc
- advanced_associations.rdoc
- association_basics.rdoc
- cheat_sheet.rdoc
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- dataset_filtering.rdoc
- mass_assignment.rdoc
- migration.rdoc
- model_hooks.rdoc
- opening_databases.rdoc
- prepared_statements.rdoc
- querying.rdoc
- reflection.rdoc
- 1.0.txt
- 1.1.txt
- 1.3.txt
- 1.4.0.txt
- 1.5.0.txt
- 2.0.0.txt
- 2.1.0.txt
- 2.10.0.txt
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- 3.2.0.txt
- 3.20.0.txt
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- 3.33.0.txt
- 3.4.0.txt
- 3.5.0.txt
- 3.6.0.txt
- 3.7.0.txt
- 3.8.0.txt
- 3.9.0.txt
- schema_modification.rdoc
- sharding.rdoc
- sql.rdoc
- testing.rdoc
- transactions.rdoc
- validations.rdoc
- virtual_rows.rdoc

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No matching classes.

# Sequel::ToDot

### Constants

TO_DOT_OPTIONS

  The option keys that should be included in the dot output.

### Public Class Methods

new(ds) click to toggle source

Given a `Dataset`, parse the internal structure to generate a dataset visualization.

        # File lib/sequel/extensions/to_dot.rb, line 19
    19:     def initialize(ds)
    20:       @i = 0
    21:       @stack = [@i]
    22:       @dot = ["digraph G {", "0 [label=\"self\"];"]
    23:       v(ds, "")
    24:       @dot << "}"
    25:     end

output(ds) click to toggle source

Given a `Dataset`, return a string in `dot` format that will generate a visualization of the dataset.

        # File lib/sequel/extensions/to_dot.rb, line 13
    13:     def self.output(ds)
    14:       new(ds).output
    15:     end

### Public Instance Methods

output() click to toggle source

Output the dataset visualization as a string in `dot` format.

        # File lib/sequel/extensions/to_dot.rb, line 28
    28:     def output
    29:       @dot.join("\n")
    30:     end

### Private Instance Methods

dot(label, j=nil) click to toggle source

Add an entry to the `dot` output with the given label. If `j` is given, it is used directly as the node or transition. Otherwise a node is created for the current object.

        # File lib/sequel/extensions/to_dot.rb, line 37
    37:     def dot(label, j=nil)
    38:       @dot << "#{j||@i} [label=#{label.to_s.inspect}];"
    39:     end

v(e, l) click to toggle source

Recursive method that parses all of Sequel’s internal datastructures, adding the appropriate nodes and transitions to the internal `dot` structure.

         # File lib/sequel/extensions/to_dot.rb, line 44
     44:     def v(e, l)
     45:       @i += 1
     46:       dot(l, "#{@stack.last} -> #{@i}") if l
     47:       @stack.push(@i)
     48:       case e
     49:       when LiteralString
     50:         dot "#{e.inspect}.lit"
     51:       when Symbol, Numeric, String, Class, TrueClass, FalseClass, NilClass
     52:         dot e.inspect
     53:       when Array
     54:         dot "Array"
     55:         e.each_with_index do |val, j|
     56:           v(val, j)
     57:         end
     58:       when Hash
     59:         dot "Hash"
     60:         e.each do |k, val|
     61:           v(val, k)
     62:         end
     63:       when SQL::ComplexExpression
     64:         dot "ComplexExpression: #{e.op}"
     65:         e.args.each_with_index do |val, j|
     66:           v(val, j)
     67:         end
     68:       when SQL::Identifier
     69:         dot "Identifier"
     70:         v(e.value, :value)
     71:       when SQL::QualifiedIdentifier
     72:         dot "QualifiedIdentifier"
     73:         v(e.table, :table)
     74:         v(e.column, :column)
     75:       when SQL::OrderedExpression
     76:         dot "OrderedExpression: #{e.descending ? :DESC : :ASC}#{" NULLS #{e.nulls.to_s.upcase}" if e.nulls}"
     77:         v(e.expression, :expression)
     78:       when SQL::AliasedExpression
     79:         dot "AliasedExpression"
     80:         v(e.expression, :expression)
     81:         v(e.aliaz, :alias)
     82:       when SQL::CaseExpression
     83:         dot "CaseExpression"
     84:         v(e.expression, :expression) if e.expression
     85:         v(e.conditions, :conditions)
     86:         v(e.default, :default)
     87:       when SQL::Cast
     88:         dot "Cast"
     89:         v(e.expr, :expr)
     90:         v(e.type, :type)
     91:       when SQL::Function
     92:         dot "Function: #{e.f}"
     93:         e.args.each_with_index do |val, j|
     94:           v(val, j)
     95:         end
     96:       when SQL::Subscript
     97:         dot "Subscript"
     98:         v(e.f, :f)
     99:         v(e.sub, :sub)
    100:       when SQL::WindowFunction
    101:         dot "WindowFunction"
    102:         v(e.function, :function)
    103:         v(e.window, :window)
    104:       when SQL::Window
    105:         dot "Window"
    106:         v(e.opts, :opts)
    107:       when SQL::PlaceholderLiteralString
    108:         str = e.str
    109:         str = "(#{str})" if e.parens
    110:         dot "PlaceholderLiteralString: #{str.inspect}"
    111:         v(e.args, :args)
    112:       when SQL::JoinClause
    113:         str = "#{e.join_type.to_s.upcase} JOIN"
    114:         if e.is_a?(SQL::JoinOnClause)
    115:           str << " ON"
    116:         elsif e.is_a?(SQL::JoinUsingClause)
    117:           str << " USING"
    118:         end
    119:         dot str
    120:         v(e.table, :table)
    121:         v(e.table_alias, :alias) if e.table_alias
    122:         if e.is_a?(SQL::JoinOnClause)
    123:           v(e.on, :on)
    124:         elsif e.is_a?(SQL::JoinUsingClause)
    125:           v(e.using, :using)
    126:         end
    127:       when Dataset
    128:         dot "Dataset"
    129:         TO_DOT_OPTIONS.each do |k|
    130:           if val = e.opts[k]
    131:             v(val, k.to_s)
    132:           end
    133:         end
    134:       else
    135:         dot "Unhandled: #{e.inspect}"
    136:       end
    137:       @stack.pop
    138:     end

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