Class: Cassandro::Model

Inherits:
Object
  • Object
show all
Defined in:
lib/cassandro/model.rb

Direct Known Subclasses

Cassandro::Migrator::CassandroMigration

Defined Under Namespace

Classes: ModelException

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(attrs = {}, persisted = false) ⇒ Model

Returns a new instance of Model.



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# File 'lib/cassandro/model.rb', line 7

def initialize(attrs = {}, persisted = false)
  @attributes = {}
  @errors = {}
  @persisted = persisted

  attrs.each do |att, val|
    next unless self.respond_to?(:"#{att}=")
    case val.class.name
    when "Set"
      send(:"#{att}=", val.to_a)
    when "Cassandra::Uuid"
      send(:"#{att}=", val.to_s)
    when "Time"
      send(:"#{att}=", val.to_datetime)
    else
      send(:"#{att}=", val)
    end
  end
end

Instance Attribute Details

#attributes ⇒ Object (readonly)

Returns the value of attribute attributes.



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# File 'lib/cassandro/model.rb', line 5

def attributes
  @attributes
end

Class Method Details

.[](value) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 155

def self.[](value)
  return nil if value.nil? || (value.respond_to?(:empty?) && value.empty?)

  if value.is_a?(Hash)
    where = "#{value.keys.map{ |k| "#{k} = ?" }.join(' AND ')} ALLOW FILTERING"
    values = value.map{ |k,v| casts[k] == :uuid ? Cassandra::Uuid.new(v) : v }
  else
    where = "#{partition_key} = ?"
    values = [casts[partition_key] == :uuid ? Cassandra::Uuid.new(value) : value]
  end

  query = <<-QUERY
    SELECT *
    FROM #{table_name}
    WHERE #{where}
  QUERY

  st = Cassandro.client.prepare(query)
  result = Cassandro.client.execute(st, *values)

  return nil unless result.any?

  self.new(self.parse_row(result.first), true)
end

.all ⇒ Object 



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# File 'lib/cassandro/model.rb', line 187

def self.all
  query = "SELECT * FROM #{self.table_name}"

  rows = Cassandro.execute(query)
  all = []
  rows.each do |row|
    all << new(self.parse_row(row), true)
  end
  all
end

.attribute(name, type = String, options = {}) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 126

def self.attribute(name, type = String, options = {})
  attributes << name
  casts[name] = type

  define_method(name) do
    @attributes[name]
  end

  define_method(:"#{name}=") do |value|
    @attributes[name] = value
  end
end

.count(key = nil, value = nil) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 214

def self.count(key = nil, value = nil)
  query = "SELECT count(*) FROM #{table_name}"

  if key && value
    key = key.to_sym
    query << " WHERE #{key} = ? ALLOW FILTERING"
    st = Cassandro.client.prepare(query)
    results = Cassandro.client.execute(st, value)
  else
    results = Cassandro.client.execute(query)
  end

  results.first["count"]
end

.create(attrs = {}) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 180

def self.create(attrs = {})
  model = new(attrs)
  model.save(true)

  model
end

.destroy_all ⇒ Object 



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# File 'lib/cassandro/model.rb', line 229

def self.destroy_all
  begin
    query = "TRUNCATE #{table_name}"
    st = Cassandro.execute(query)
    st.is_a? Cassandra::Client::VoidResult
  rescue e
    false
  end
end

.primary_key(keys) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 139

def self.primary_key(keys)
  if keys.is_a?(Array)
    pk.push(*keys)
  else
    pk << keys
  end
end

.query(where, *values) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 239

def self.query(where, *values)
  query = "SELECT * FROM #{table_name} WHERE #{where} ALLOW FILTERING"
  st = Cassandro.client.prepare(query)
  Cassandro.client.execute(st, *values)
end

.table(name) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 122

def self.table(name)
  self.table_name = name.to_s
end

.unique(keys) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 147

def self.unique(keys)
  if keys.is_a?(Array)
    uniques.push(*keys)
  else
    uniques << keys
  end
end

.where(key, value) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 198

def self.where(key, value)
  key = key.to_sym
  results = []

  query = "SELECT * FROM #{table_name} WHERE #{key} = ? ALLOW FILTERING"

  st = Cassandro.client.prepare(query)
  rows = Cassandro.client.execute(st, value)

  rows.each do |result|
    results << new(result, true)
  end

  results
end

Instance Method Details

#cast(attribute) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 43

def cast(attribute)
  self.class.cast_as(attribute, @attributes[attribute])
end

#clear_errors ⇒ Object 



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# File 'lib/cassandro/model.rb', line 35

def clear_errors
  @errors = {}
end

#destroy ⇒ Object 



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# File 'lib/cassandro/model.rb', line 114

def destroy
  query = <<-QUERY
    DELETE FROM #{self.class.table_name}
    WHERE #{self.class.pk.flatten.map { |k| "#{k.to_s} = #{self.class.cast_as(k, @attributes[k])}" }.join(' AND ')}
  QUERY
  Cassandro.execute(query)
end

#errors ⇒ Object 



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# File 'lib/cassandro/model.rb', line 31

def errors
  @errors
end

#persisted? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cassandro/model.rb', line 27

def persisted?
  @persisted
end

#save(insert_check = false) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 82

def save(insert_check = false)
  clear_errors

  if self.class.casts[:id] == :uuid
    @attributes[:id] ||= SecureRandom.uuid
  end

  self.class.pk.flatten.each do |key|
    if @attributes[key].nil?
      @errors[:primary_key] = "#{key.to_s}_cant_be_nil"
      return false
    end
  end

  if !persisted? && self.class.uniqueness_defined? && !unique?
    @errors[:unique] = "#{self.class.to_s.downcase}_not_unique"
    return false
  end

  st = self.statement_for(:insert, :insert_check => insert_check)

  begin
    r = Cassandro.client.execute(st, *self.native_attributes)
    raise ModelException.new('not_applied') unless !insert_check || (insert_check && r.first["[applied]"])
    @persisted = true
  rescue => e
    @attributes[:id] = nil if !persisted? && @attributes.has_key?(:id)
    @errors[:save] = e.message
    false
  end
end

#unique? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cassandro/model.rb', line 47

def unique?
  self.class.uniqueness_defined? ? self.class[@attributes.slice(*self.class.uniques)].nil? : true
end

#update_attributes(attrs = {}) ⇒ Object 



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# File 'lib/cassandro/model.rb', line 51

def update_attributes(attrs = {})
  attrs = attrs.inject({}) do |memo, (k,v)|
    memo[k.to_sym] = (v.nil? || v.to_s.empty?) ? nil : v #TODO: fix for Set, Map
    memo
  end#symbolize keys for later merge

  p_keys = []
  fields = []

  self.class.pk.flatten.each do |k|
    p_keys << "#{k} = #{cast(k)}"
  end

  attrs.keys.each do |field|
    fields << "#{field} = ?"
  end

  query = "UPDATE #{self.class.table_name} SET #{fields.join(", ")} "
  query += "WHERE #{p_keys.join(" AND ")}"

  begin
    st = Cassandro.client.prepare(query)
    Cassandro.client.execute(st, *native_attributes(attrs))
    @attributes.merge!(attrs)
    true
  rescue Exception => e
    @errors[:update_error] = e.message
    false
  end
end

#valid? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/cassandro/model.rb', line 39

def valid?
  self.class.pk.any? && @errors.empty?
end