Skip to content
This repository
Fetching contributors…

Cannot retrieve contributors at this time

file 309 lines (256 sloc) 7.383 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 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 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309
module Arel
  class SelectManager < Arel::TreeManager
    include Arel::Crud

    def initialize engine, table = nil
      super(engine)
      @ast = Nodes::SelectStatement.new
      @ctx = @ast.cores.last
      from table
    end

    def initialize_copy other
      super
      @ctx = @ast.cores.last
    end

    def limit
      @ast.limit && @ast.limit.expr
    end
    alias :taken :limit

    def constraints
      @ctx.wheres
    end

    def offset
      @ast.offset && @ast.offset.expr
    end

    def skip amount
      if amount
        @ast.offset = Nodes::Offset.new(amount)
      else
        @ast.offset = nil
      end
      self
    end
    alias :offset= :skip

    ###
    # Produces an Arel::Nodes::Exists node
    def exists
      Arel::Nodes::Exists.new @ast
    end

    def as other
      create_table_alias grouping(@ast), Nodes::SqlLiteral.new(other)
    end

    def where_clauses
      if $VERBOSE
        warn "(#{caller.first}) where_clauses is deprecated and will be removed in arel 4.0.0 with no replacement"
      end
      to_sql = Visitors::ToSql.new @engine.connection
      @ctx.wheres.map { |c| to_sql.accept c }
    end

    def lock locking = Arel.sql('FOR UPDATE')
      case locking
      when true
        locking = Arel.sql('FOR UPDATE')
      when Arel::Nodes::SqlLiteral
      when String
        locking = Arel.sql locking
      end

      @ast.lock = Nodes::Lock.new(locking)
      self
    end

    def locked
      @ast.lock
    end

    def on *exprs
      @ctx.source.right.last.right = Nodes::On.new(collapse(exprs))
      self
    end

    def group *columns
      columns.each do |column|
        # FIXME: backwards compat
        column = Nodes::SqlLiteral.new(column) if String === column
        column = Nodes::SqlLiteral.new(column.to_s) if Symbol === column

        @ctx.groups.push Nodes::Group.new column
      end
      self
    end

    def from table
      table = Nodes::SqlLiteral.new(table) if String === table
      # FIXME: this is a hack to support
      # test_with_two_tables_in_from_without_getting_double_quoted
      # from the AR tests.

      case table
      when Nodes::Join
        @ctx.source.right << table
      else
        @ctx.source.left = table
      end

      self
    end

    def froms
      @ast.cores.map { |x| x.from }.compact
    end

    def join relation, klass = Nodes::InnerJoin
      return self unless relation

      case relation
      when String, Nodes::SqlLiteral
        raise if relation.blank?
        klass = Nodes::StringJoin
      end

      @ctx.source.right << create_join(relation, nil, klass)
      self
    end

    def having *exprs
      @ctx.having = Nodes::Having.new(collapse(exprs, @ctx.having))
      self
    end

    def project *projections
      # FIXME: converting these to SQLLiterals is probably not good, but
      # rails tests require it.
      @ctx.projections.concat projections.map { |x|
        [Symbol, String].include?(x.class) ? SqlLiteral.new(x.to_s) : x
      }
      self
    end

    def projections= projections
      @ctx.projections = projections
    end

    def distinct(value = true)
      if value
        @ctx.set_quantifier = Arel::Nodes::Distinct.new
      else
        @ctx.set_quantifier = nil
      end
    end

    def order *expr
      # FIXME: We SHOULD NOT be converting these to SqlLiteral automatically
      @ast.orders.concat expr.map { |x|
        String === x || Symbol === x ? Nodes::SqlLiteral.new(x.to_s) : x
      }
      self
    end

    def orders
      @ast.orders
    end

    def wheres
      warn "#{caller[0]}: SelectManager#wheres is deprecated and will be removed in ARel 4.0.0 with no replacement"
      Compatibility::Wheres.new @engine.connection, @ctx.wheres
    end

    def where_sql
      return if @ctx.wheres.empty?

      viz = Visitors::WhereSql.new @engine.connection
      Nodes::SqlLiteral.new viz.accept @ctx
    end

    def union operation, other = nil
      if other
        node_class = Nodes.const_get("Union#{operation.to_s.capitalize}")
      else
        other = operation
        node_class = Nodes::Union
      end

      node_class.new self.ast, other.ast
    end

    def intersect other
      Nodes::Intersect.new ast, other.ast
    end

    def except other
      Nodes::Except.new ast, other.ast
    end
    alias :minus :except

    def with *subqueries
      if subqueries.first.is_a? Symbol
        node_class = Nodes.const_get("With#{subqueries.shift.to_s.capitalize}")
      else
        node_class = Nodes::With
      end
      @ast.with = node_class.new(subqueries.flatten)

      self
    end

    def take limit
      if limit
        @ast.limit = Nodes::Limit.new(limit)
        @ctx.top = Nodes::Top.new(limit)
      else
        @ast.limit = nil
        @ctx.top = nil
      end
      self
    end
    alias limit= take

    def join_sql
      return nil if @ctx.source.right.empty?

      sql = visitor.dup.extend(Visitors::JoinSql).accept @ctx
      Nodes::SqlLiteral.new sql
    end

    def order_clauses
      visitor = Visitors::OrderClauses.new(@engine.connection)
      visitor.accept(@ast).map { |x|
        Nodes::SqlLiteral.new x
      }
    end

    def join_sources
      @ctx.source.right
    end

    def source
      @ctx.source
    end

    def joins manager
      if $VERBOSE
        warn "joins is deprecated and will be removed in 4.0.0"
        warn "please remove your call to joins from #{caller.first}"
      end
      manager.join_sql
    end

    class Row < Struct.new(:data) # :nodoc:
      def id
        data['id']
      end

      def method_missing(name, *args)
        name = name.to_s
        return data[name] if data.key?(name)
        super
      end
    end

    def to_a # :nodoc:
      warn "to_a is deprecated. Please remove it from #{caller[0]}"
      # FIXME: I think `select` should be made public...
      @engine.connection.send(:select, to_sql, 'AREL').map { |x| Row.new(x) }
    end

    # FIXME: this method should go away
    def insert values
      if $VERBOSE
        warn <<-eowarn
insert (#{caller.first}) is deprecated and will be removed in ARel 4.0.0. Please
switch to `compile_insert`
eowarn
      end

      im = compile_insert(values)
      table = @ctx.froms

      primary_key = table.primary_key
      primary_key_name = primary_key.name if primary_key

      # FIXME: in AR tests values sometimes were Array and not Hash therefore is_a?(Hash) check is added
      primary_key_value = primary_key && values.is_a?(Hash) && values[primary_key]
      im.into table
      # Oracle adapter needs primary key name to generate RETURNING ... INTO ... clause
      # for tables which assign primary key value using trigger.
      # RETURNING ... INTO ... clause will be added only if primary_key_value is nil
      # therefore it is necessary to pass primary key value as well
      @engine.connection.insert im.to_sql, 'AREL', primary_key_name, primary_key_value
    end

    private
    def collapse exprs, existing = nil
      exprs = exprs.unshift(existing.expr) if existing
      exprs = exprs.compact.map { |expr|
        if String === expr
          # FIXME: Don't do this automatically
          Arel.sql(expr)
        else
          expr
        end
      }

      if exprs.length == 1
        exprs.first
      else
        create_and exprs
      end
    end
  end
end
Something went wrong with that request. Please try again.