Class Hash
In: lib/sequel/extensions/core_extensions.rb
lib/sequel/extensions/pg_json.rb
lib/sequel/extensions/pg_hstore.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 108
108:   def &(ce)
109:     ::Sequel::SQL::BooleanExpression.new(:AND, self, ce)
110:   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 138
138:   def case(*args)
139:     ::Sequel::SQL::CaseExpression.new(to_a, *args)
140:   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 309
309:     def hstore
310:       Sequel::Postgres::HStore.new(self)
311:     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 204
204:     def pg_json
205:       Sequel::Postgres::JSONHash.new(self)
206:     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 148
148:   def sql_expr
149:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self)
150:   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 157
157:   def sql_negate
158:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :AND, true)
159:   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 166
166:   def sql_or
167:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR)
168:   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 118
118:   def |(ce)
119:     ::Sequel::SQL::BooleanExpression.new(:OR, self, ce)
120:   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 127
127:   def ~
128:     ::Sequel::SQL::BooleanExpression.from_value_pairs(self, :OR, true)
129:   end

[Validate]