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a5cac2ab52
Remove usage of `.blank?` to match empty strings with a regular expression instead.
146 lines
3.2 KiB
Ruby
146 lines
3.2 KiB
Ruby
module Arel
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class Table
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include Arel::Crud
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include Arel::FactoryMethods
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@engine = nil
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class << self; attr_accessor :engine; end
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attr_accessor :name, :engine, :aliases, :table_alias
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# TableAlias and Table both have a #table_name which is the name of the underlying table
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alias :table_name :name
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def initialize name, engine = Table.engine
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@name = name.to_s
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@engine = engine
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@columns = nil
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@aliases = []
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@table_alias = nil
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@primary_key = nil
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if Hash === engine
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@engine = engine[:engine] || Table.engine
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# Sometime AR sends an :as parameter to table, to let the table know
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# that it is an Alias. We may want to override new, and return a
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# TableAlias node?
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@table_alias = engine[:as] unless engine[:as].to_s == @name
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end
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end
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def primary_key
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if $VERBOSE
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warn <<-eowarn
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primary_key (#{caller.first}) is deprecated and will be removed in Arel 4.0.0
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eowarn
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end
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@primary_key ||= begin
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primary_key_name = @engine.connection.primary_key(name)
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# some tables might be without primary key
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primary_key_name && self[primary_key_name]
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end
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end
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def alias name = "#{self.name}_2"
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Nodes::TableAlias.new(self, name).tap do |node|
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@aliases << node
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end
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end
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def from table
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SelectManager.new(@engine, table)
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end
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def join relation, klass = Nodes::InnerJoin
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return from(self) unless relation
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case relation
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when String, Nodes::SqlLiteral
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raise if relation.empty?
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klass = Nodes::StringJoin
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end
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from(self).join(relation, klass)
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end
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def outer_join relation
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join(relation, Nodes::OuterJoin)
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end
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def group *columns
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from(self).group(*columns)
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end
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def order *expr
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from(self).order(*expr)
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end
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def where condition
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from(self).where condition
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end
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def project *things
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from(self).project(*things)
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end
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def take amount
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from(self).take amount
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end
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def skip amount
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from(self).skip amount
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end
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def having expr
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from(self).having expr
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end
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def [] name
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::Arel::Attribute.new self, name
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end
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def select_manager
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SelectManager.new(@engine)
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end
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def insert_manager
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InsertManager.new(@engine)
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end
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def update_manager
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UpdateManager.new(@engine)
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end
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def delete_manager
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DeleteManager.new(@engine)
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end
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def hash
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# Perf note: aliases, table alias and engine is excluded from the hash
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# aliases can have a loop back to this table breaking hashes in parent
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# relations, for the vast majority of cases @name is unique to a query
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@name.hash
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end
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def eql? other
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self.class == other.class &&
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self.name == other.name &&
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self.engine == other.engine &&
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self.aliases == other.aliases &&
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self.table_alias == other.table_alias
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end
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alias :== :eql?
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private
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def attributes_for columns
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return nil unless columns
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columns.map do |column|
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Attributes.for(column).new self, column.name.to_sym
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end
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end
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end
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end
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