Class: Baza::Driver::Pg::Column

Inherits:
Column
  • Object
show all
Defined in:
lib/baza/driver/pg/column.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Column

#after, #data, #inspect, #table, #to_param, #to_s

Methods included from Baza::DatabaseModelFunctionality

#model_name, #to_model

Constructor Details

#initialize(args) ⇒ Column

Returns a new instance of Column.



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# File 'lib/baza/driver/pg/column.rb', line 4

def initialize(args)
  @db = args.fetch(:db)
  @data = args.fetch(:data)
  @name = @data.fetch(:column_name)
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/baza/driver/pg/column.rb', line 2

def name
  @name
end

Instance Method Details

#autoincr? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/pg/column.rb', line 59

def autoincr?
  !@data.fetch(:column_default).to_s.match(/\Anextval\('#{Regexp.escape(table_name)}_#{Regexp.escape(name)}_seq'::regclass\)\Z/).nil?
end

#change(data) ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 79

def change(data)
  if data.key?(:name) && data.fetch(:name).to_s != name
    @db.query("#{alter_table_sql} RENAME #{col_escaped} TO #{@db.sep_col}#{@db.escape_column(data.fetch(:name))}#{@db.sep_col}")
    @name = data.fetch(:name).to_s
  end

  change_type = true if data.key?(:type) && data.fetch(:type).to_s != type.to_s
  change_type = true if data.key?(:maxlength) && data.fetch(:maxlength) != maxlength

  if change_type
    type = data[:type].to_s || type.to_s

    if type == "int"
      using = " USING (trim(#{name})::integer)"
    else
      using = ""
    end

    @db.query("#{alter_column_sql} TYPE #{data.fetch(:type)}#{using}")
    @type = nil
    changed = true
  end

  if data.key?(:null) && data.fetch(:null) != null?
    if data.fetch(:null)
      @db.query("#{alter_column_sql} DROP NOT NULL")
    else
      @db.query("#{alter_column_sql} ADD NOT NULL")
    end

    changed = true
  end

  if data.key?(:default) && data.fetch(:default) != default
    if data.fetch(:default).nil?
      @db.query("#{alter_column_sql} DROP DEFAULT")
    else
      default = "'#{@db.esc(data.fetch(:default))}'"
      @db.query("#{alter_column_sql} SET DEFAULT #{default}")
    end

    changed = true
  end

  reload if changed
  self
end

#create_foreign_key(args) ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 14

def create_foreign_key(args)
  fk_name = args[:name]
  fk_name ||= "fk_#{table_name}_#{name}"

  other_column = args.fetch(:column)
  other_table = other_column.table

  sql = "
    ALTER TABLE #{@db.escape_table(table_name)}
    ADD CONSTRAINT #{@db.escape_table(fk_name)}
    FOREIGN KEY (#{@db.escape_table(name)})
    REFERENCES #{@db.escape_table(other_table.name)} (#{@db.escape_column(other_column.name)})
  "

  @db.query(sql)

  true
end

#default ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 63

def default
  return nil if autoincr?
  @data.fetch(:column_default)
end

#drop ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 68

def drop
  @db.query("ALTER TABLE #{@db.sep_table}#{@db.escape_table(table_name)}#{@db.sep_table} DROP COLUMN #{@db.sep_col}#{@db.escape_column(name)}#{@db.sep_col}")
  nil
end

#maxlength ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 47

def maxlength
  @data.fetch(:character_maximum_length)
end

#null? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/pg/column.rb', line 51

def null?
  @data.fetch(:is_nullable) == "YES"
end

#primarykey? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza/driver/pg/column.rb', line 55

def primarykey?
  autoincr?
end

#reload ⇒ Object

Raises:



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# File 'lib/baza/driver/pg/column.rb', line 73

def reload
  data = @db.single([:information_schema, :columns], table_name: table_name, column_name: name)
  raise Baza::Errors::ColumnNotFound unless data
  @data = data
end

#table_name ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 10

def table_name
  @_table_name ||= @data.fetch(:table_name)
end

#type ⇒ Object 



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# File 'lib/baza/driver/pg/column.rb', line 33

def type
  unless @type
    type = @data.fetch(:udt_name)

    if type == "int4"
      @type = :int
    else
      @type = type.to_sym
    end
  end

  @type
end