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 



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# 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 



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# 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 



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# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 78

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

#indexes(table_name, name = nil) ⇒ Object 



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# 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("   SELECT distinct i.relname, d.indisunique, d.indkey, m.amname, t.oid, \n            pg_get_expr(d.indpred, t.oid), pg_get_expr(d.indexprs, t.oid)\n     FROM pg_class t, pg_class i, pg_index d, pg_am m\n   WHERE i.relkind = 'i'\n     AND i.relam = m.oid\n     AND d.indexrelid = i.oid\n     AND d.indisprimary = 'f'\n     AND t.oid = d.indrelid\n     AND t.relname = '\#{table_name}'\n     AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname IN (\#{schemas}) )\n  ORDER BY i.relname\n  SQL\n\n  result.map do |(index_name, is_unique, indkey, kind, oid, conditions, expression)|\n    unique = (is_unique == 't')\n    index_keys = indkey.split(\" \")\n\n    columns = Hash[query(<<-SQL, \"Columns for index \#{index_name} on \#{table_name}\")]\n    SELECT a.attnum, a.attname\n    FROM pg_attribute a\n    WHERE a.attrelid = \#{oid}\n    AND a.attnum IN (\#{index_keys.join(\",\")})\n    SQL\n\n    column_names = columns.values_at(*index_keys).compact\n    if md = expression.try(:match, /^lower\\(\\(?([^)]+)\\)?(::text)?\\)$/i)\n      column_names << md[1]\n    end\n    index = ::ActiveRecord::ConnectionAdapters::IndexDefinition.new(table_name, index_name, unique, column_names)\n    index.conditions = conditions\n    index.case_sensitive = !(expression =~ /lower/i)\n    index.kind = kind unless kind.downcase == \"btree\"\n    index.expression = expression\n    index\n  end\nend\n", name)

#reverse_foreign_keys(table_name, name = nil) ⇒ Object 



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# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 88

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

#supports_partial_indexes? ⇒ Boolean 



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# 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 



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# File 'lib/redhillonrails_core/active_record/connection_adapters/postgresql_adapter.rb', line 108

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

#views(name = nil) ⇒ Object 



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# 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("SELECT viewname\n  FROM pg_views\n WHERE schemaname IN (\#{schemas})\n  SQL\nend\n", name).map { |row| row[0] }