Class Hash
In: lib/sequel/extensions/core_extensions.rb
lib/sequel/extensions/pg_hstore.rb
lib/sequel/extensions/pg_json.rb
Parent: Object

Sequel extends Hash to add methods to implement the SQL DSL.

Methods

&   case   hstore   pg_json   pg_jsonb   sql_expr   sql_negate   sql_or   |   ~  

Public Instance methods

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

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 104
104:   def &(ce)
105:     ::Sequel::SQL::BooleanExpression.new(:AND, self, ce)
106:   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

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 134
134:   def case(*args)
135:     ::Sequel::SQL::CaseExpression.new(to_a, *args)
136:   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

[Source]

     # File lib/sequel/extensions/pg_hstore.rb, line 342
342:     def hstore
343:       Sequel::Postgres::HStore.new(self)
344:     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.

[Source]

     # File lib/sequel/extensions/pg_json.rb, line 331
331:     def pg_json
332:       Sequel::Postgres::JSONHash.new(self)
333:     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.

[Source]

     # File lib/sequel/extensions/pg_json.rb, line 338
338:     def pg_jsonb
339:       Sequel::Postgres::JSONBHash.new(self)
340:     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)

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 144
144:   def sql_expr
145:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self)
146:   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)

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 153
153:   def sql_negate
154:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :AND, true)
155:   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)

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 162
162:   def sql_or
163:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR)
164:   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

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 114
114:   def |(ce)
115:     ::Sequel::SQL::BooleanExpression.new(:OR, self, ce)
116:   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)

[Source]

     # File lib/sequel/extensions/core_extensions.rb, line 123
123:   def ~
124:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR, true)
125:   end

[Validate]