Module: RedhillonrailsCore::ActiveRecord::ConnectionAdapters::PostgresqlAdapter

Defined in:
lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



5
6
7
8
9
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 5

def self.included(base)
  base.class_eval do
    remove_method :indexes
  end
end

Instance Method Details

#add_index(table_name, column_name, options = {}) ⇒ Object 



11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 11

def add_index(table_name, column_name, options = {})
  column_name, options = [], column_name if column_name.is_a?(Hash)
  column_names = Array(column_name)
  if column_names.empty?
    raise ArgumentError, "No columns and :expression missing from options - cannot create index" if options[:expression].blank?
    raise ArgumentError, "Index name not given. Pass :name option" if options[:name].blank?
  end

  index_type = options[:unique] ? "UNIQUE" : ""
  index_name = options[:name] || index_name(table_name, column_names)
  conditions = options[:conditions]

  if column_names.empty? then
    sql = "CREATE #{index_type} INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} #{options[:expression]}"
  else
    quoted_column_names = column_names.map { |e| options[:case_sensitive] == false && e.to_s !~ /_id$/ ? "LOWER(#{quote_column_name(e)})" : quote_column_name(e) }

    sql = "CREATE #{index_type} INDEX #{quote_column_name(index_name)} ON #{quote_table_name(table_name)} (#{quoted_column_names.join(", ")})"
    sql += " WHERE (#{ ::ActiveRecord::Base.send(:sanitize_sql, conditions, quote_table_name(table_name)) })" if conditions
  end
  execute sql
end

#foreign_keys(table_name, name = nil) ⇒ Object 



78
79
80
81
82
83
84
85
86
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 78

def foreign_keys(table_name, name = nil)
  load_foreign_keys(<<-SQL, name)
SELECT f.conname, pg_get_constraintdef(f.oid), t.relname
  FROM pg_class t, pg_constraint f
 WHERE f.conrelid = t.oid
   AND f.contype = 'f'
   AND t.relname = '#{table_name}'
  SQL
end

#indexes(table_name, name = nil) ⇒ Object 



38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 38

def indexes(table_name, name = nil)
  schemas = schema_search_path.split(/,/).map { |p| quote(p) }.join(',')
  result = query(<<-SQL, name)
   SELECT distinct i.relname, d.indisunique, d.indkey, m.amname, t.oid, 
            pg_get_expr(d.indpred, t.oid), pg_get_expr(d.indexprs, t.oid)
     FROM pg_class t, pg_class i, pg_index d, pg_am m
   WHERE i.relkind = 'i'
     AND i.relam = m.oid
     AND d.indexrelid = i.oid
     AND d.indisprimary = 'f'
     AND t.oid = d.indrelid
     AND t.relname = '#{table_name}'
     AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname IN (#{schemas}) )
  ORDER BY i.relname
  SQL

  result.map do |(index_name, is_unique, indkey, kind, oid, conditions, expression)|
    unique = (is_unique == 't')
    index_keys = indkey.split(" ")

    columns = Hash[query(<<-SQL, "Columns for index #{index_name} on #{table_name}")]
    SELECT a.attnum, a.attname
    FROM pg_attribute a
    WHERE a.attrelid = #{oid}
    AND a.attnum IN (#{index_keys.join(",")})
    SQL

    column_names = columns.values_at(*index_keys).compact
    if md = expression.try(:match, /^lower\(\(?([^)]+)\)?(::text)?\)$/i)
      column_names << md[1]
    end
    index = ::ActiveRecord::ConnectionAdapters::IndexDefinition.new(table_name, index_name, unique, column_names)
    index.conditions = conditions
    index.case_sensitive = !(expression =~ /lower/i)
    index.kind = kind unless kind.downcase == "btree"
    index.expression = expression
    index
  end
end

#reverse_foreign_keys(table_name, name = nil) ⇒ Object 



88
89
90
91
92
93
94
95
96
97
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 88

def reverse_foreign_keys(table_name, name = nil)
  load_foreign_keys(<<-SQL, name)
SELECT f.conname, pg_get_constraintdef(f.oid), t2.relname
  FROM pg_class t, pg_class t2, pg_constraint f
 WHERE f.confrelid = t.oid
   AND f.conrelid = t2.oid
   AND f.contype = 'f'
   AND t.relname = '#{table_name}'
  SQL
end

#supports_partial_indexes? ⇒ Boolean

Returns:

  • (Boolean) 


34
35
36
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 34

def supports_partial_indexes?
  true
end

#view_definition(view_name, name = nil) ⇒ Object 



108
109
110
111
112
113
114
115
116
117
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 108

def view_definition(view_name, name = nil)
  result = query(<<-SQL, name)
SELECT pg_get_viewdef(oid)
  FROM pg_class
 WHERE relkind = 'v'
   AND relname = '#{view_name}'
  SQL
  row = result.first
  row.first unless row.nil?
end

#views(name = nil) ⇒ Object 



99
100
101
102
103
104
105
106
 
# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 99

def views(name = nil)
  schemas = schema_search_path.split(/,/).map { |p| quote(p) }.join(',')
  query(<<-SQL, name).map { |row| row[0] }
SELECT viewname
  FROM pg_views
 WHERE schemaname IN (#{schemas})
  SQL
end