Module: Sequel::Dataset::DatasetSourceAlias

Defined in:
lib/sequel/extensions/dataset_source_alias.rb

Instance Method Summary collapse

Instance Method Details

#from(*source, &block) ⇒ Object

Preprocess the list of sources and attempt to alias any datasets in the sources to the first source of the respective dataset.

[View source]

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# File 'lib/sequel/extensions/dataset_source_alias.rb', line 50

def from(*source, &block)
  virtual_row_columns(source, block)
  table_aliases = []
  source = source.map do |s|
    case s
    when Dataset
      s = dataset_source_alias_expression(s, table_aliases)
    when Symbol, String, SQL::AliasedExpression, SQL::Identifier, SQL::QualifiedIdentifier
      table_aliases << alias_symbol(s)
    end
    s
  end
  super(*source, &nil)
end

#join_table(type, table, expr = nil, options = OPTS) ⇒ Object

If a Dataset is given as the table argument, attempt to alias it to its source.

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# File 'lib/sequel/extensions/dataset_source_alias.rb', line 67

def join_table(type, table, expr=nil, options=OPTS)
  if table.is_a?(Dataset) && !options[:table_alias]
    table = dataset_source_alias_expression(table)
  end
  super
end