Class: ActiveRecord::ConnectionAdapters::PostGISAdapter::MainAdapter

Inherits:
PostgreSQLAdapter
  • Object
show all
Includes:
CommonAdapterMethods
Defined in:
lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb

Overview

:nodoc:

Constant Summary collapse

@@native_database_types = 
nil

Instance Method Summary collapse

Methods included from CommonAdapterMethods

#adapter_name, #default_srid, #postgis_lib_version, #quote, #set_rgeo_factory_settings, #spatial_column_constructor, #srs_database_columns

Constructor Details

#initialize(*args_) ⇒ MainAdapter

Returns a new instance of MainAdapter.



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 5

def initialize(*args_)
  # Overridden to change the visitor
  super
  @visitor = ::Arel::Visitors::PostGIS.new(self)
end

Instance Method Details

#add_column(table_name_, column_name_, type_, options_ = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 115

def add_column(table_name_, column_name_, type_, options_={})
  table_name_ = table_name_.to_s
  column_name_ = column_name_.to_s
  if (info_ = spatial_column_constructor(type_.to_sym))
    limit_ = options_[:limit]
    if type_.to_s == 'geometry' &&
      (options_[:no_constraints] || limit_.is_a?(::Hash) && limit_[:no_constraints])
    then
      options_.delete(:limit)
      super
    else
      options_.merge!(limit_) if limit_.is_a?(::Hash)
      type_ = (options_[:type] || info_[:type] || type_).to_s.gsub('_', '').upcase
      has_z_ = options_[:has_z]
      has_m_ = options_[:has_m]
      srid_ = (options_[:srid] || PostGISAdapter::DEFAULT_SRID).to_i
      if options_[:geographic]
        type_ << 'Z' if has_z_
        type_ << 'M' if has_m_
        execute("ALTER TABLE #{quote_table_name(table_name_)} ADD COLUMN #{quote_column_name(column_name_)} GEOGRAPHY(#{type_},#{srid_})")
        change_column_default(table_name_, column_name_, options_[:default]) if options_include_default?(options_)
        change_column_null(table_name_, column_name_, false, options_[:default]) if options_[:null] == false
      else
        type_ = "#{type_}M" if has_m_ && !has_z_
        dimensions_ = 2
        dimensions_ += 1 if has_z_
        dimensions_ += 1 if has_m_
        execute("SELECT AddGeometryColumn('#{quote_string(table_name_)}', '#{quote_string(column_name_)}', #{srid_}, '#{quote_string(type_)}', #{dimensions_})")
      end
    end
  else
    super
  end
end

#add_index(table_name_, column_name_, options_ = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 161

def add_index(table_name_, column_name_, options_={})
  # FULL REPLACEMENT. RE-CHECK ON NEW VERSIONS.
  # We have to fully-replace because of the gist_clause.
  options_ ||= {}
  gist_clause_ = options_.delete(:spatial) ? ' USING GIST' : ''
  index_name_, index_type_, index_columns_, index_options_ = add_index_options(table_name_, column_name_, options_)
  execute "CREATE #{index_type_} INDEX #{quote_column_name(index_name_)} ON #{quote_table_name(table_name_)}#{gist_clause_} (#{index_columns_})#{index_options_}"
end

#columns(table_name_, name_ = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 30

def columns(table_name_, name_=nil)
  # FULL REPLACEMENT. RE-CHECK ON NEW VERSIONS.
  # We needed to return a spatial column subclass.
  table_name_ = table_name_.to_s
  spatial_info_ = spatial_column_info(table_name_)
  column_definitions(table_name_).collect do |col_name_, type_, default_, notnull_, oid_, fmod_|
    oid_ = type_map.fetch(oid_.to_i, fmod_.to_i) {
      OID::Identity.new
    }
    SpatialColumn.new(@rgeo_factory_settings, table_name_, col_name_, default_, oid_, type_,
      notnull_ == 'f', type_ =~ /geometry/i ? spatial_info_[col_name_] : nil)
  end
end

#create_table(table_name_, options_ = {}, &block_) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 95

def create_table(table_name_, options_={}, &block_)
  table_name_ = table_name_.to_s
  # Call super and snag the table definition
  table_definition_ = nil
  super(table_name_, options_) do |td_|
    block_.call(td_) if block_
    table_definition_ = td_
  end
  table_definition_.non_geographic_spatial_columns.each do |col_|
    type_ = col_.spatial_type.gsub('_', '').upcase
    has_z_ = col_.has_z?
    has_m_ = col_.has_m?
    type_ = "#{type_}M" if has_m_ && !has_z_
    dimensions_ = 2
    dimensions_ += 1 if has_z_
    dimensions_ += 1 if has_m_
    execute("SELECT AddGeometryColumn('#{quote_string(table_name_)}', '#{quote_string(col_.name.to_s)}', #{col_.srid}, '#{quote_string(type_)}', #{dimensions_})")
  end
end

#create_table_definition(name_, temporary_, options_, as_ = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 90

def create_table_definition(name_, temporary_, options_, as_=nil)
  # Override to create a spatial table definition (post-4.0.0.beta1)
  PostGISAdapter::TableDefinition.new(native_database_types, name_, temporary_, options_, as_, self)
end

#indexes(table_name_, name_ = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 44

def indexes(table_name_, name_=nil)
  # FULL REPLACEMENT. RE-CHECK ON NEW VERSIONS.
  result_ = query(<<-SQL, 'SCHEMA')
    SELECT distinct i.relname, d.indisunique, d.indkey, pg_get_indexdef(d.indexrelid), t.oid
    FROM pg_class t
    INNER JOIN pg_index d ON t.oid = d.indrelid
    INNER JOIN pg_class i ON d.indexrelid = i.oid
    WHERE i.relkind = 'i'
      AND d.indisprimary = 'f'
      AND t.relname = '#{table_name_}'
      AND i.relnamespace IN (SELECT oid FROM pg_namespace WHERE nspname = ANY (current_schemas(false)) )
    ORDER BY i.relname
  SQL

  result_.map do |row_|
    index_name_ = row_[0]
    unique_ = row_[1] == 't'
    indkey_ = row_[2].split(" ")
    inddef_ = row_[3]
    oid_ = row_[4]

    columns_ = query(<<-SQL, "SCHEMA")
      SELECT a.attnum, a.attname, t.typname
        FROM pg_attribute a, pg_type t
      WHERE a.attrelid = #{oid_}
        AND a.attnum IN (#{indkey_.join(",")})
        AND a.atttypid = t.oid
    SQL
    columns_ = columns_.inject({}){ |h_, r_| h_[r_[0].to_s] = [r_[1], r_[2]]; h_ }
    column_names_ = columns_.values_at(*indkey_).compact.map{ |a_| a_[0] }

    # add info on sort order for columns (only desc order is explicitly specified, asc is the default)
    desc_order_columns_ = inddef_.scan(/(\w+) DESC/).flatten
    orders_ = desc_order_columns_.any? ? Hash[desc_order_columns_.map {|order_column_| [order_column_, :desc]}] : {}
    where_ = inddef_.scan(/WHERE (.+)$/).flatten[0]
    spatial_ = inddef_ =~ /using\s+gist/i && columns_.size == 1 &&
      (columns_.values.first[1] == 'geometry' || columns_.values.first[1] == 'geography')

    if column_names_.empty?
      nil
    else
      ::RGeo::ActiveRecord::SpatialIndexDefinition.new(table_name_, index_name_, unique_, column_names_, [], orders_, where_, spatial_ ? true : false)
    end
  end.compact
end

#native_database_types ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 15

def native_database_types
  # Overridden to add the :spatial type
  @@native_database_types ||= super.merge(
    :spatial => {:name => 'geometry'},
    :geography => {:name => 'geography'})
end

#remove_column(table_name_, column_name_, type_ = nil, options_ = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 150

def remove_column(table_name_, column_name_, type_=nil, options_={})
  table_name_ = table_name_.to_s
  column_name_ = column_name_.to_s
  spatial_info_ = spatial_column_info(table_name_)
  if spatial_info_.include?(column_name_)
    execute("SELECT DropGeometryColumn('#{quote_string(table_name_)}','#{quote_string(column_name_)}')")
  else
    super
  end
end

#spatial_column_info(table_name_) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 170

def spatial_column_info(table_name_)
  info_ = query("SELECT f_geometry_column,coord_dimension,srid,type FROM geometry_columns WHERE f_table_name='#{quote_string(table_name_.to_s)}'")
  result_ = {}
  info_.each do |row_|
    name_ = row_[0]
    type_ = row_[3]
    dimension_ = row_[1].to_i
    has_m_ = type_ =~ /m$/i ? true : false
    type_.sub!(/m$/, '')
    has_z_ = dimension_ > 3 || dimension_ == 3 && !has_m_
    result_[name_] = {
      :name => name_,
      :type => type_,
      :dimension => dimension_,
      :srid => row_[2].to_i,
      :has_z => has_z_,
      :has_m => has_m_,
    }
  end
  result_
end

#type_cast(value_, column_, array_member_ = false) ⇒ Object 



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# File 'lib/active_record/connection_adapters/postgis_adapter/rails4/main_adapter.rb', line 22

def type_cast(value_, column_, array_member_=false)
  if ::RGeo::Feature::Geometry.check_type(value_)
    ::RGeo::WKRep::WKBGenerator.new(:hex_format => true, :type_format => :ewkb, :emit_ewkb_srid => true).generate(value_)
  else
    super
  end
end