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

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

Methods

&   case   hstore   pg_json   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 102
102:   def &(ce)
103:     ::Sequel::SQL::BooleanExpression.new(:AND, self, ce)
104:   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 132
132:   def case(*args)
133:     ::Sequel::SQL::CaseExpression.new(to_a, *args)
134:   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 293
293:   def hstore
294:     Sequel::Postgres::HStore.new(self)
295:   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 175
175:   def pg_json
176:     Sequel::Postgres::JSONHash.new(self)
177:   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 142
142:   def sql_expr
143:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self)
144:   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 151
151:   def sql_negate
152:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :AND, true)
153:   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 160
160:   def sql_or
161:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR)
162:   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 112
112:   def |(ce)
113:     ::Sequel::SQL::BooleanExpression.new(:OR, self, ce)
114:   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 121
121:   def ~
122:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR, true)
123:   end

[Validate]