Class: Prequel::Relations::Relation

Inherits:
Object
  • Object
show all
Defined in:
lib/prequel/relations/relation.rb

Direct Known Subclasses

InnerJoin, Projection, Selection, Table

Instance Method Summary collapse

Instance Method Details

#find(id) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 10

def find(id)
  where(:id => id).first
end

#get_column(name) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 38

def get_column(name)
  resolved = resolve(name)
  derive(resolved) if resolved
end

#join(right, predicate) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 18

def join(right, predicate)
  InnerJoin.new(self, right, predicate)
end

#project(*symbols) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 22

def project(*symbols)
  Projection.new(self, *symbols)
end

#query ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 6

def query
  Sql::Query.new(self).build
end

#singular_table_ref(query) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 30

def singular_table_ref(query)
  query.add_subquery(self)
end

#table_ref(query) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 26

def table_ref(query)
  singular_table_ref(query)
end

#to_relation ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 34

def to_relation
  self
end

#where(predicate) ⇒ Object 



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# File 'lib/prequel/relations/relation.rb', line 14

def where(predicate)
  Selection.new(self, predicate)
end