Class: Sequel::Postgres::HStore

Inherits:
Hash show all
Includes:
SQL::AliasMethods
Defined in:
lib/sequel/extensions/pg_hstore.rb,
lib/sequel/extensions/pg_hstore_ops.rb

Defined Under Namespace

Modules: DatabaseMethods Classes: Parser

Constant Summary collapse

DEFAULT_PROC =

Default proc used for all underlying HStore hashes, so that even if you grab the underlying hash, it will still convert non-string keys to strings during lookup.

lambda{|h, k| h[k.to_s] unless k.is_a?(String)}
QUOTE = 
'"'.freeze
COMMA = 
",".freeze
KV_SEP = 
"=>".freeze
NULL = 
"NULL".freeze
ESCAPE_RE = 
/("|\\)/.freeze
ESCAPE_REPLACE = 
'\\\\\1'.freeze
HSTORE_CAST = 
'::hstore'.freeze

Class Method Summary collapse

Instance Method Summary collapse

Methods included from SQL::AliasMethods

#as

Methods inherited from Hash

#&, #case, #hstore, #pg_json, #sql_expr, #sql_negate, #sql_or, #|, #~

Class Method Details

._load(args) ⇒ Object

Use custom marshal loading, since underlying hash uses a default proc.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 205

def self._load(args)
  new(Hash[Marshal.load(args)])
end

.parse(str) ⇒ Object

Parse the given string into an HStore, assuming the str is in PostgreSQL hstore output format.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 211

def self.parse(str)
  new(Parser.new(str).parse)
end

Instance Method Details

#_dump ⇒ Object

Use custom marshal dumping, since underlying hash uses a default proc.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 237

def _dump(*)
  Marshal.dump(to_a)
end

#fetch(key, *args, &block) ⇒ Object

Override to force the key argument to a string.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 242

def fetch(key, *args, &block)
  super(key.to_s, *args, &block)
end

#merge(hash, &block) ⇒ Object

Convert the input hash to string keys and values before merging, and return a new HStore instance with the merged hash.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 248

def merge(hash, &block)
  self.class.new(super(convert_hash(hash), &block))
end

#op ⇒ Object

Wrap the receiver in an HStoreOp so you can easily use the PostgreSQL hstore functions and operators with it.



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# File 'lib/sequel/extensions/pg_hstore_ops.rb', line 299

def op
  HStoreOp.new(self)
end

#sql_literal_append(ds, sql) ⇒ Object

Append a literalize version of the hstore to the sql.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 256

def sql_literal_append(ds, sql)
  ds.literal_append(sql, unquoted_literal)
  sql << HSTORE_CAST
end

#unquoted_literal ⇒ Object

Return a string containing the unquoted, unstring-escaped literal version of the hstore. Separated out for use by the bound argument code.



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# File 'lib/sequel/extensions/pg_hstore.rb', line 264

def unquoted_literal
  str = ''
  comma = false
  commas = COMMA
  quote = QUOTE
  kv_sep = KV_SEP
  null = NULL
  each do |k, v|
    str << commas if comma
    str << quote << escape_value(k) << quote
    str << kv_sep
    if v.nil?
      str << null
    else
      str << quote << escape_value(v) << quote
    end
    comma = true
  end
  str
end