Class: Selekt::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/selekt/query.rb

Defined Under Namespace

Classes: Relation

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(sql) ⇒ Query

Returns a new instance of Query.



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# File 'lib/selekt/query.rb', line 15

def initialize(sql)
  @ast = Selekt.parser.parse(sql) or raise Selekt::ParseError.new("Could not parse SQL query: #{sql}")
end

Instance Attribute Details

#ast ⇒ Object (readonly)

Returns the value of attribute ast.



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# File 'lib/selekt/query.rb', line 13

def ast
  @ast
end

Instance Method Details

#relations ⇒ Object 



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# File 'lib/selekt/query.rb', line 19

def relations
  find_nodes(ast, Selekt::SQL::TableReference).map { |tr| Relation.new(tr.schema_name, tr.table_name) }.uniq
end

#source_names ⇒ Object 



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# File 'lib/selekt/query.rb', line 27

def source_names
  sources.map(&:variable_name).uniq
end

#sources ⇒ Object 



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# File 'lib/selekt/query.rb', line 23

def sources
  find_nodes(ast, Selekt::SQL::Source)
end

#sql ⇒ Object 



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# File 'lib/selekt/query.rb', line 36

def sql
  ast.input
end

#stub(source_name, source_stub) ⇒ Object 



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# File 'lib/selekt/query.rb', line 31

def stub(source_name, source_stub)
  stub_sql = source_stub.respond_to?(:sql) ? source_stub.sql : source_stub.to_s
  self.class.new(render_stubbed_sql(ast, source_name.to_s, stub_sql))
end