Sequel extends Hash
to add methods
to implement the SQL DSL.
Return a Sequel::SQL::BooleanExpression
created from this
hash, matching all of the conditions in this hash and the condition
specified by the given argument.
{:a=>1} & :b # SQL: a = 1 AND b {:a=>true} & ~:b # SQL: a IS TRUE AND NOT b
# File lib/sequel/extensions/core_extensions.rb, line 108 def &(ce) ::Sequel::SQL::BooleanExpression.new(:AND, self, ce) end
Return a Sequel::SQL::CaseExpression
with this hash as the
conditions and the given default value. Note that the order of the
conditions will be arbitrary on ruby 1.8, so all conditions should be
orthogonal.
{{:a=>[2,3]}=>1}.case(0) # SQL: CASE WHEN a IN (2, 3) THEN 1 ELSE 0 END {:a=>1, :b=>2}.case(:d, :c) # SQL: CASE c WHEN a THEN 1 WHEN b THEN 2 ELSE d END # or: CASE c WHEN b THEN 2 WHEN a THEN 1 ELSE d END
# File lib/sequel/extensions/core_extensions.rb, line 138 def case(*args) ::Sequel::SQL::CaseExpression.new(to_a, *args) end
Create a new HStore using the receiver as the input hash. Note that the HStore created will not use the receiver as the backing store, since it has to modify the hash. To get the new backing store, use:
hash.hstore.to_hash
# File lib/sequel/extensions/pg_hstore.rb, line 339 def hstore Sequel::Postgres::HStore.new(self) end
Return a Sequel::Postgres::JSONHash proxy to the receiver. This is mostly useful as a short cut for creating JSONHash objects that didn't come from the database.
# File lib/sequel/extensions/pg_json.rb, line 227 def pg_json Sequel::Postgres::JSONHash.new(self) end
Return a Sequel::SQL::BooleanExpression
created from this
hash, matching all of the conditions. Rarely do you need to call this
explicitly, as Sequel generally assumes that
hashes specify this type of condition.
{:a=>true}.sql_expr # SQL: a IS TRUE {:a=>1, :b=>[2, 3]}.sql_expr # SQL: a = 1 AND b IN (2, 3)
# File lib/sequel/extensions/core_extensions.rb, line 148 def sql_expr ::Sequel::SQL::BooleanExpression.from_value_pairs(self) end
Return a Sequel::SQL::BooleanExpression
created from this
hash, matching none of the conditions.
{:a=>true}.sql_negate # SQL: a IS NOT TRUE {:a=>1, :b=>[2, 3]}.sql_negate # SQL: a != 1 AND b NOT IN (2, 3)
# File lib/sequel/extensions/core_extensions.rb, line 157 def sql_negate ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :AND, true) end
Return a Sequel::SQL::BooleanExpression
created from this
hash, matching any of the conditions.
{:a=>true}.sql_or # SQL: a IS TRUE {:a=>1, :b=>[2, 3]}.sql_or # SQL: a = 1 OR b IN (2, 3)
# File lib/sequel/extensions/core_extensions.rb, line 166 def sql_or ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR) end
Return a Sequel::SQL::BooleanExpression
created from this
hash, matching all of the conditions in this hash or the condition
specified by the given argument.
{:a=>1} | :b # SQL: a = 1 OR b {:a=>true} | ~:b # SQL: a IS TRUE OR NOT b
# File lib/sequel/extensions/core_extensions.rb, line 118 def |(ce) ::Sequel::SQL::BooleanExpression.new(:OR, self, ce) end
Return a Sequel::SQL::BooleanExpression
created from this
hash, not matching all of the conditions.
~{:a=>true} # SQL: a IS NOT TRUE ~{:a=>1, :b=>[2, 3]} # SQL: a != 1 OR b NOT IN (2, 3)
# File lib/sequel/extensions/core_extensions.rb, line 127 def ~ ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR, true) end