Class: SQLObject

Inherits:
Object show all
Defined in:
lib/activeleopard/sql_object.rb

Direct Known Subclasses

ActiveLeopard::Base

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ SQLObject

Returns a new instance of SQLObject.



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# File 'lib/activeleopard/sql_object.rb', line 126

def initialize(params = {})
  self.class.columns.each do |attr_name|
    params_val = params[attr_name] || params[attr_name.to_s]
    params_val.strip! if params_val
    send("#{attr_name}=", params_val)
  end

  params.each do |attr_name, val|
    attr_method = "#{attr_name}="
    next if self.class.columns.include?(attr_name.to_sym)
    next unless self.respond_to?(attr_method)

    val.strip! if val
    send(attr_method, val)
  end

  if self.class.callbacks[:after_initialize]
    send(self.class.callbacks[:after_initialize])
  end
end

Class Method Details

.after_initialize(method_name) ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 2

def self.after_initialize(method_name)
  callbacks[:after_initialize] = method_name
end

.all ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 6

def self.all
  Relation.new({}, self)
end

.callbacks ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 10

def self.callbacks
  @callbacks ||= {}
end

.columns ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 14

def self.columns
  return @columns if @columns

  cols = DBConnection.execute(<<-SQL, [self.table_name])
    SELECT
      column_name
    FROM
      information_schema.columns
    WHERE
      table_name = $1
  SQL

  @columns = cols.map { |c| c['column_name'].to_sym }
end

.destroy_all ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 29

def self.destroy_all
  DBConnection.execute(<<-SQL)
    DELETE FROM #{self.table_name}
  SQL
end

.finalize! ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 35

def self.finalize!
  self.columns.each do |col|
    define_method(col) do #setter method
      attributes[col]
    end

    define_method("#{col}=") do |val| #getter method
      attributes[col] = val
    end
  end
end

.first ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 47

def self.first
  first_data = DBConnection.get_first_row(<<-SQL)
  SELECT
    *
  FROM
    #{self.table_name}
  ORDER BY
    id
  LIMIT
    1
  SQL

  self.new(first_data)
end

.last ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 62

def self.last
  last_data = DBConnection.get_first_row(<<-SQL)
  SELECT
    *
  FROM
    #{self.table_name}
  ORDER BY
    id DESC
  LIMIT
    1
  SQL

  self.new(last_data)
end

.parse_all(all_options) ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 77

def self.parse_all(all_options)
  all_options.map { |options| self.new(options) }
end

.table_name ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 85

def self.table_name
  @table_name ||= self.to_s.tableize.gsub('humen') { 'humans' }
end

.table_name=(table_name) ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 81

def self.table_name=(table_name)
  @table_name = table_name
end

.validations ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 89

def self.validations
  @validations ||= []
end

Instance Method Details

#attr_count ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 97

def attr_count
  @attributes.count
end

#attr_values_to_update ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 105

def attr_values_to_update
  attributes.reject { |attr_name, _| attr_name == :id }.values
end

#attribute_values ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 101

def attribute_values
  attributes.values
end

#attributes ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 93

def attributes
  @attributes ||= {}
end

#col_names ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 109

def col_names
  self.class.columns
  .map(&:to_s)
  .drop(1).join(', ')
end

#destroy ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 115

def destroy
  DBConnection.execute(<<-SQL, [self.id])
    DELETE FROM #{self.class.table_name}
    WHERE id = $1
  SQL
end

#errors ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 122

def errors
  @errors ||= Hash.new { |h, k| h[k] = [] }
end

#insert ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 147

def insert
  result = DBConnection.execute(<<-SQL, attr_values_to_update)
  INSERT INTO
    #{self.class.table_name} (#{col_names})
  VALUES
    (#{question_marks})
  RETURNING
    id
  SQL

  self.id = result.getvalue(0,0)
end

#question_marks ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 160

def question_marks
  (1...attributes.count).map { |n| "$#{n}"}.join(', ')
end

#save ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 164

def save
  validate!
  if valid?
    id ? update : insert
    true
  else
    show_errors
    false
  end
end

#show_errors ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 175

def show_errors
  errors.each do |key, messages|
    messages.each { |m| puts "#{key} #{m}" }
  end
end

#to_s ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 181

def to_s
  "#{self.class}:#{self.object_id}"
end

#update ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 189

def update
  vals = attr_values_to_update << id
  DBConnection.execute(<<-SQL, vals)
    UPDATE
      #{self.class.table_name}
    SET
      #{update_set_line}
    WHERE
      id = $#{vals.length}
  SQL
end

#update_set_line ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 185

def update_set_line
  col_names.split(', ').map.with_index { |c, i| "#{c} = $#{i + 1}" }.join(', ')
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/activeleopard/sql_object.rb', line 209

def valid?
  validate!
  errors.all? { |_, v| v.empty? }
end

#validate! ⇒ Object 



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# File 'lib/activeleopard/sql_object.rb', line 201

def validate!
  @errors = Hash.new { |h, k| h[k] = [] }

  self.class.validations.each do |validation|
    self.send(validation)
  end
end