Module: MassRecord::Actions

Includes:
ActionView::Helpers::TextHelper
Included in:
MassRecord
Defined in:
lib/mass_record.rb

Defined Under Namespace

Classes: IndividualError

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#individual_count ⇒ Object

Returns the value of attribute individual_count.



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# File 'lib/mass_record.rb', line 22

def individual_count
  @individual_count
end

#mass_count ⇒ Object

Returns the value of attribute mass_count.



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# File 'lib/mass_record.rb', line 22

def mass_count
  @mass_count
end

Instance Method Details

#collect_errored_objects(found_in: {}, from: [], key: {}, synonyms: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 255

def collect_errored_objects found_in:{}, from:[], key:{}, synonyms:{}
  return [] if found_in.blank? or from.blank?

  errored_objects = []

  found_in.each do |operation, tables|
    unless operation == :run_time
      tables.each do |table, column_sets|
        unless table == :run_time
          column_sets.each do |column_set,error|
            unless column_set == :run_time
              if error.is_a? Exception and error.is_a? ActiveRecord::StatementInvalid
                # collect objects by operation, table, and column set
                operation_terms = synonyms[operation.to_sym]
                errored_objects += from.select{|x| table.to_s == x[key[:table]].to_s and operation_terms.include? x[key[:operation]].to_sym and x[key[:object]].keys.sort == column_set.sort}
              end
            end
          end
        end
      end
    end
  end

  return errored_objects
end

#collect_individually_errored_objects(from: [], based_on: [], key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 227

def collect_individually_errored_objects from:[], based_on:[], key:{}
  individuals = []
  based_on.each do |error|
    if error.is_a? IndividualError and !error.json_object.blank?
      errored_object = from.select{|object| object[key[:table]] === get_table_name(error.table) and ['save',error.operation].include?(object[key[:operation]]) and object[key[:object]] === error.json_object }.first
      individuals << errored_object unless errored_object.blank? 
    end
  end
  return individuals
end

#collect_run_time_errors(found_in: {}, loop_limit: 10) ⇒ Object 



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# File 'lib/mass_record.rb', line 238

def collect_run_time_errors found_in:{}, loop_limit:10
  return [] if found_in.blank?
  run_time_errors = []

  while found_in.is_a? Hash and loop_limit > 0
    loop_limit -= 1
    found_in.each do |k,v|
      if k == :run_time
        run_time_errors << v
      else 
        run_time_errors += collect_run_time_errors found_in:v, loop_limit:loop_limit
      end
    end
  end
  return run_time_errors
end

#convert_to_db_format(json_object, model: nil, created_at: 'created_at', updated_at: 'updated_at') ⇒ Object 



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# File 'lib/mass_record.rb', line 715

def convert_to_db_format json_object, model:nil, created_at:'created_at', updated_at:'updated_at'
  throw "No Model provided, cannot format the data for the specified columns" if model.blank?

  time = Time.now.to_s(:db)
  crud_times = [created_at,updated_at]
  json_object.each do |k,v|
    v = Time.parse v if v.is_a? String and [:datetime, :date, :time, :timestamp].include? model.column_types[k].type.to_sym.downcase    # fix funky to_json format if present
    v = time if crud_times.include? k and (v.blank? or k == updated_at) and model.column_names.include? k                 # add crud time if it is blank and it is a column in the model or if it is update_at just add the time
    # convert to correct database type
    begin 
      v = model.connection.type_cast v, model.column_types[k]
      # handles a bug in the activerecord-sqlserver-adapter gem version 4.1
      v = (v=='f' ? 0 : 1) if model.column_types[k].sql_type == 'bit' and ['f','t'].include?(v.to_s.downcase)
      v = model.connection.quote_string v if v.is_a? String
    rescue Exception => e   # If it is a text field, automatically yamlize it if there is a non text type passed in (just like normal active record saves)
      v = model.connection.type_cast v.to_yaml, model.column_types[k] if e.is_a? TypeError and model.column_types[k].type == :text
    end
    json_object[k] = v
  end

  #TODO: handle if updated_at field is not present in the hash, but is in the model (so that all transactions have an accurate updated_at)

  return json_object
end

#execute_queued_queries(key: { operation:"operation", table:"table", object:"object" }, synonyms: { insert: [:create, :new, :add, :insert, :post], update: [:update,:edit,:modify,:put,:patch], select: [:read,:select,:get], save: [:save], delete: [:delete] }, folder: { queued:path[:queued_queries], errored:path[:errored_queries], completed:path[:completed_queries] }, file_tag: Time.now.strftime("%Y%m%d%H%M%S%L").to_s) ⇒ Object 



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# File 'lib/mass_record.rb', line 119

def execute_queued_queries key:{
    operation:"operation", 
    table:"table", 
    object:"object"
  },synonyms:{
    insert: [:create, :new, :add, :insert, :post],
    update: [:update,:edit,:modify,:put,:patch],
    select: [:read,:select,:get],
    save:   [:save],
    delete: [:delete]
  },folder:{
    queued:path[:queued_queries],
    errored:path[:errored_queries],
    completed:path[:completed_queries]
  },file_tag:Time.now.strftime("%Y%m%d%H%M%S%L").to_s
  self.individual_count, self.mass_count, errored_objects = 0,0,[]

  files = Dir.foreach(folder[:queued]).collect{|x| x}.keep_if{|y|y=~/\.json$/i}
  json_objects = []

  # rename to avoid double processing
  files.each{|x| File.rename "#{folder[:queued]}/#{x}","#{folder[:queued]}/#{x}.processing"}

  # load all the json
  files.each do |file|
    File.open("#{folder[:queued]}/#{file}.processing",'r') do |f|
      json = JSON.parse(f.read)
      json_objects += json
    end
  end

  # validate all objects
  validation_results = mass_validate json_objects
  logger.debug "#{validation_results[:passed_orders].count} valid objects of #{json_objects.count} total objects".black.on_white
  json_objects = validation_results[:passed_orders]

  # get all operations and tables in use
  operations = json_objects.collect{|x| x[key[:operation]].to_sym}.to_set.to_a
  logger.debug "Operations: #{operations.pretty_inspect}".black.on_white rescue logger.debug "Error logging operations"

  # construct mass queries
  errors = {}
  operations.each do |op|
    if synonyms[:insert].include? op
      errors[:insert] = mass_insert_by_table json_objects.select{|x| synonyms[:insert].include? x[key[:operation]].to_sym.downcase}, key:key
    elsif synonyms[:update].include? op
      errors[:update] = mass_update_by_table json_objects.select{|x| synonyms[:update].include? x[key[:operation]].to_sym.downcase}, key:key
    elsif synonyms[:save].include? op # needs to intelligently determine if the order already exists, insert if not, update if so
      errors[:save] = mass_save_by_table json_objects.select{|x| :save == x[key[:operation]].to_sym.downcase}, key:key
    elsif synonyms[:delete].include? op
    elsif synonyms[:select].include? op
    else
    end
  end

  # Collect mass errors and the associated objects
  errors_present = errors.any?{|op,tables| tables.has_key? :run_time or tables.any?{|table,col_sets| !col_sets.blank?}}
  errored_objects = collect_errored_objects found_in:errors, from:json_objects, key:key, synonyms:synonyms if errors_present

  # Retry objects from the failed queries on an individual query basis
  individual_errors = errors_present ? (query_per_object errored_objects, key:key, synonyms:synonyms) : []

  # Collect individual errors and their associated objects with the option for custom handling
  individually_errored_objects = collect_individually_errored_objects from:errored_objects, based_on:individual_errors, key:key
  individual_errors += (collect_run_time_errors found_in:errors) + validation_results[:failed_orders]
  default_error_handling = handle_individual_errors_callback errors:individual_errors, errored_objects:individually_errored_objects, all_objects:json_objects

  # Save failed objects, archive all objects, and log out a summary
  if default_error_handling 
    # Save a new file with just the errored objects in the errored folder 
    # (which will be all the objects if there is not a 1 to 1 ratio between the errors and errored objects)
    # THEN save a new file with ALL the objects in the completed folder
    if json_objects.count > 0
      if individual_errors.count == individually_errored_objects.count
        File.open("#{folder[:errored]}/errored_only_#{file_tag}.json",'w'){|f| f.write individually_errored_objects.to_json} if individual_errors.count > 0
        File.open("#{folder[:completed]}/#{file_tag}.json",'w'){|f| f.write json_objects.to_json}
      else
        File.open("#{folder[:errored]}/all_#{file_tag}.json",'w'){|f| f.write json_objects.to_json}
      end
    end

    # Delete all the original files
    file_names = files.collect{|x| "#{folder[:queued]}/#{x}.processing"}
    File.delete(*file_names)

    # Log out a summary of what happened
    logger.info "\nProcessed #{pluralize((json_objects.count),'object')} with #{pluralize((individual_errors.count),'error')}".black.on_white
    logger.info "\tMass Queries:\t\t#{self.mass_count} for #{pluralize((json_objects.count - errored_objects.count),'object')}\n\tRecovery Queries:\t#{self.individual_count} for #{pluralize(errored_objects.count,'object')}\n\tErrors:\t\t\t#{individual_errors.count}".black.on_white if individual_errors.count > 0 or logger.debug?
    individual_errors.each_with_index{|x,i| logger.info "\t\t(#{i}) #{x.to_s[0..90]}...".black.on_white} if individual_errors.count > 0 or logger.debug?
  end
  return individual_errors
end

#get_model(from: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 385

def get_model from:nil
  return from if from.is_a? Class
  if from.is_a? String
    model = from.constantize rescue nil
    model = from.classify.constantize rescue nil if model.blank?
    return model
  end
  return nil
end

#get_table_name(table) ⇒ Object

always returns the name of the table (String) regardless of whether the name is passed in or if the model is passed in



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# File 'lib/mass_record.rb', line 218

def get_table_name table
  if table.is_a? String
    return table
  elsif table.methods.include? :name
    return table.name
  end
  return table
end

#handle_individual_errors_callback(errors: [], errored_objects: [], all_objects: []) ⇒ Object 



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# File 'lib/mass_record.rb', line 212

def handle_individual_errors_callback errors:[], errored_objects:[], all_objects:[]
  # TODO: must be manually overidden.  Assumes a true return value means to use the engines default error handling and logging, and a false return value means to skip all subsequent actions
  return true
end

#insert(hashes, into: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 475

def insert hashes, into:nil
  begin
    return false if hashes.blank? or into.blank?

    logger.debug "Insert #{into.to_s}>".black.on_white
    hashes = [hashes] unless hashes.is_a? Array
    model = get_model from:into

    errors = []
    # create an array of single insert queries
    hashes.each do |hash|
      sql = sql_for_insert hash, into:model
      begin
        query sql, connection:model
        self.individual_count += 1
        logger << ".".black.on_white if logger.debug?
      rescue Exception => e
        logger.debug e.message
        logger << 'E'.black.on_white if logger.info?
        errors << IndividualError.new(e,table:into,operation:"insert",json_object:hash)
      end
    end
    return errors
  rescue Exception => e
    return (defined? errors) ? (errors << IndividualError.new(e, table:into, operation:"insert")) : [IndividualError.new( e, table:into, operation:"insert")]
  end
end

#insert_by_table(json_objects, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 370

def insert_by_table json_objects, key:{}
  begin
    tables = json_objects.collect{|x| x[key[:table]]}.to_set.to_a

    errors = []
    tables.each do |table|
      hashes = json_objects.select{|o| o[key[:table]] == table}.collect{|x| x[key[:object]]}
      errors += insert hashes, into:table
    end
    return errors
  rescue Exception => e
    return ((defined? errors) ? (errors << IndividualError.new(e,operation:"insert")) : [IndividualError.new(e,operation:"insert")])
  end
end

#mass_insert(hashes, into: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 667

def mass_insert hashes, into:nil
  begin
    return false if hashes.blank? or into.blank?

    # create an array of single insert queries
    model = get_model from:into
    concentrated_queries = {}

    logger.debug "#{into}: Parsing #{hashes.count} hashes into a single query>".black.on_white
    hashes.each do |hash|
      logger << ".".black.on_white if logger.debug?
      original_key_set = hash.keys.sort
      sql = sql_for_insert hash, into:model

      # group the queries by unique column lists
      into_clause = sql.gsub /\s*VALUES.*$/,''
      value_clause = sql.gsub(/^.*VALUES\s*/,'')
      
      concentrated_queries[original_key_set] = {} unless concentrated_queries[original_key_set].is_a? Hash
      concentrated_queries[original_key_set][:into] = into_clause
      concentrated_queries[original_key_set][:values] = [] unless concentrated_queries[original_key_set][:values].is_a? Array
      concentrated_queries[original_key_set][:values] << value_clause
    end

    errors = {}

    # reparse the queries and execute them
    concentrated_queries.each do |column_set,clauses|
      final_query = "#{clauses[:into]} VALUES #{clauses[:values].join(", ")}"
      begin
        # puts "press enter to continue...:"  if Rails.env = 'development' and defined?(Rails::Console) and logger.debug?
        # gets                if Rails.env = 'development' and defined?(Rails::Console) and logger.debug?
        query final_query, connection:model
        self.mass_count += 1
      rescue Exception => e
        logger.debug e.message
        logger.info e.message.to_s[0..1000]
        errors[column_set] = e
      end
    end
    return errors
  rescue Exception => e
    logger.error e.message
    return (defined? errors) ? (errors.merge!({run_time:e})) : {run_time:e}
  end
end

#mass_insert_by_table(json_objects, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 647

def mass_insert_by_table json_objects, key:{}
  begin    
    tables = json_objects.collect{|x| x[key[:table]]}.to_set.to_a

    errors = {}
    tables.each do |table|
      # logger.info "Table: #{table}".black.on_white
      hashes = json_objects.select{|o| o[key[:table]] == table}.collect{|x| x[key[:object]]}

      errors[table.to_sym] = {} unless errors[table.to_sym].is_a? Hash
      errors[table.to_sym].merge! mass_insert hashes, into:table
    end
    return errors
  rescue Exception => e
    return {run_time:e} unless defined? errors
    errors[:run_time] = e if defined? errors
    return errors
  end
end

#mass_save_by_table(json_objects, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 528

def mass_save_by_table json_objects, key:{}
  begin
    tables = json_objects.collect{|x| x[key[:table]]}.to_set.to_a

    errors = {}
    tables.each do |table|
      # logger.info "Table: #{table}".black.on_white
      # sort the hashes by operation type
      sorted_hashes = sort_save_operations from:json_objects, for_table:table, key:key

      # perform the appropriate operations
      model = get_model from:table
      errors[table.to_sym] = {}
      errors[table.to_sym].merge! mass_update sorted_hashes[:update], into:model unless sorted_hashes[:update].blank?
      errors[table.to_sym].merge! mass_insert sorted_hashes[:insert], into:model unless sorted_hashes[:insert].blank?
    end
    return errors
  rescue Exception => e
    return {run_time:e} unless defined? errors
    errors[:run_time] = e if defined? errors
    return errors
  end
end

#mass_update(hashes, into: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 552

def mass_update hashes, into:nil
  begin
    return false if hashes.blank? or into.blank?

    model = get_model from:into
    id_column_name = model.primary_key
    created_at = model.attribute_alias?("created_at") ? model.attribute_alias("created_at") : "created_at"
    updated_at = model.attribute_alias?("updated_at") ? model.attribute_alias("updated_at") : "updated_at"
    solitary_queries = [] # I think this can be deleted
    t = model.arel_table  # I think this can be deleted

    # organize by unique column sets
    unique_column_sets = {}

    hashes.each do |hash|
      column_set = hash.keys.sort
      unique_column_sets[column_set] = [] unless unique_column_sets.has_key? column_set and unique_column_sets[column_set].is_a? Array
      unique_column_sets[column_set] << hash
    end

    # assemble and execute queries (1 for each unique set of columns)
    queries = []
    errors = {}
    unique_column_sets.each do |column_set, hash_group|
      if id_column_name.is_a? Array
        ids = hash_group.collect{|hash| Hash[id_column_name.map.with_index{|column_name,i| [column_name,hash[column_name]] }]}
        update =  "UPDATE #{model.table_name} SET "
        where_clauses = []
        id_column_name.each do |key|
          value_set = ids.collect{|id_set| model.connection.quote(model.connection.type_cast(id_set[key], model.column_types[key]))}
          where_clauses << "(#{model.table_name}.#{key} in (#{value_set.join ','}))"
        end
        where = "WHERE #{where_clauses.join ' and '}"

        set_fragments = {}

        hash_group.each do |hash|
          hash = convert_to_db_format hash, model:model
          if id_column_name.all?{|column_name| hash.has_key? column_name}  # if the hash has all primary keys
            hash.each do |k,v|
              unless id_column_name.include? k   # don't allow the update of primary key columns
                set_fragments[k] = [] unless set_fragments.has_key? k and set_fragments[k].is_a? Array
                case_fragments = []
                id_column_name.each do |key|
                  case_fragments << "#{model.connection.quote_column_name key} = #{model.connection.quote hash[key]}"
                end
                set_fragments[k] << "WHEN (#{case_fragments.join ' and '}) THEN #{model.connection.quote v}"
              end
            end
          end
        end
      else
        ids = hash_group.collect{|x| x[id_column_name]}
        update =  "UPDATE #{model.table_name} SET "
        where =   "WHERE #{model.table_name}.#{id_column_name} in ('#{ids.join("','")}')"

        set_fragments = {}

        hash_group.each do |hash|
          hash = convert_to_db_format hash, model:model  # TODO: adapt the method to work nicely with updates (ie- don't overwrite the created_at)
          if hash.has_key? id_column_name
            hash.each do |k,v|
              if k != id_column_name
                set_fragments[k] = [] unless set_fragments.has_key? k and set_fragments[k].is_a? Array
                set_fragments[k] << "WHEN #{model.connection.quote hash[id_column_name]} THEN #{model.connection.quote v}"
              end
            end
          end
        end
      end

      set_columns = []

      set_fragments.each do |column, values|
        set_columns << "#{column} = CASE #{model.table_name}.#{id_column_name} #{values.join ' ' } WHEN 'findabetterwaytodothis' THEN '0' END" unless id_column_name.is_a? Array  #TODO: ugly hack, find a better solution
        set_columns << "#{column} = CASE #{values.join ' '} WHEN 1=0 THEN '0' END" if id_column_name.is_a? Array
      end

      begin
        query "#{update} #{set_columns.join ', '} #{where}", connection:model
        self.mass_count += 1
      rescue Exception => e
        logger.debug e.message
        logger.info e.message.to_s[0..1000]
        errors[column_set] = e
      end
    end

    return errors   
  rescue Exception => e
    return (defined? errors) ? (errors.merge!({run_time:e})) : {run_time:e}
  end
end

#mass_update_by_table(json_objects, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 508

def mass_update_by_table json_objects, key:{}
  begin
    tables = json_objects.collect{|x| x[key[:table]]}.to_set.to_a

    errors = {}
    tables.each do |table|
      # logger.info "Table: #{table}".black.on_white
      hashes = json_objects.select{|o| o[key[:table]] == table}.collect{|x| x[key[:object]]}

      errors[table.to_sym] = {} unless errors[table.to_sym].is_a? Hash
      errors[table.to_sym].merge! mass_update hashes, into:table
    end
    return errors
  rescue Exception => e
    return {run_time:e} unless defined? errors
    errors[:run_time] = e if defined? errors
    return errors
  end
end

#mass_validate(objects) ⇒ Object 



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# File 'lib/mass_record.rb', line 503

def mass_validate objects
  # TODO: write logic, should return only valid objects
  return objects
end

#query(sql, connection: database_connection) ⇒ Object 



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# File 'lib/mass_record.rb', line 740

def query sql, connection:database_connection
  sql = sql.gsub /`(.*?)`/,'\1'                            # some queries don't like the "`"s
  if connection.blank?                               # a blank value was passed in or the cached connection is empty
    res = ActiveRecord::Base.connection.execute sql
    ActiveRecord::Base.connection.close
  elsif connection.is_a? Class and connection.ancestors.include? ActiveRecord::Base  # an ActiveRecord Class was passed in
    connection.connection.execute sql
    connection.connection.close
  else
    res = connection.execute sql
  end

  return res
end

#query_per_object(objects, key: {}, synonyms: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 281

def query_per_object objects, key:{}, synonyms:{}
  logger.info "Executing #{objects.count} individual queries...".black.on_white
  # get all operations and tables in use
  operations = objects.collect{|x| x[key[:operation]].to_sym}.to_set.to_a

  # construct queries
  errors = []
  operations.each do |op|
    if synonyms[:insert].include? op
      errors += insert_by_table objects.select{|x| synonyms[:insert].include? x[key[:operation]].to_sym.downcase}, key:key
    elsif synonyms[:update].include? op
      errors += update_by_table objects.select{|x| synonyms[:update].include? x[key[:operation]].to_sym.downcase}, key:key
    elsif synonyms[:save].include? op # needs to intelligently determine if the order already exists, insert if not, update if so
      errors += save_by_table objects.select{|x| :save == x[key[:operation]].to_sym.downcase}, key:key
    elsif synonyms[:delete].include? op
    elsif synonyms[:select].include? op
    else
    end
  end
  return errors
end

#queue_for_quick_query(object_array, operation: :save, folder: {queued:path[:queued_queries]}, file_tag: Time.now.strftime("%Y%m%d%H%M%S%L").to_s, key: { table: "table", operation: "operation", object: "object" }, only: []) ⇒ Object

TODO: add logic to append the data if the filename already exists accepts an array of objects with the option to specify what rails operation to perform



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# File 'lib/mass_record.rb', line 87

def queue_for_quick_query object_array, 
  operation: :save, 
  folder:{queued:path[:queued_queries]}, 
  file_tag:Time.now.strftime("%Y%m%d%H%M%S%L").to_s,
  key:{
    table: "table",
    operation: "operation",
    object: "object"      
  },only:[]

  object_array = [object_array] unless object_array.is_a? Array
  return false if object_array.blank?
  class_array = object_array.collect{|x| x.class.name}

  object_array = slim_data(object_array, keep:only, operation:operation) if operation.to_s == 'update' or !only.blank? or object_array.any?{|x| !x.new_record?}

  queue = []

  object_array.each_with_index do |object,i|
    queue << {
      key[:table] => class_array[i], 
      key[:operation] =>  (operation.to_s.downcase == 'save') ? specify_save(on:object) : operation , 
      key[:object] => object
    } unless object.blank?
  end
  # begin
    File.open(folder[:queued]+"/#{operation.to_s}_#{file_tag}.json",'w'){|f| f.write queue.to_json} unless queue.blank?
  # rescue Exception => e
  #  pp "#{e.message}\n#{e.backtrace[0..5].pretty_inspect}".red
  # end
end

#save_by_table(json_objects, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 350

def save_by_table json_objects, key:{}      
  begin
    tables = json_objects.collect{|x| x[key[:table]]}.to_set.to_a

    errors = []
    tables.each do |table|
      # sort the hashes by operation type
      sorted_hashes = sort_save_operations from:json_objects, for_table:table, key:key

      # perform the appropriate operations
      model = get_model from:table
      errors += update sorted_hashes[:update], into:model unless sorted_hashes[:update].blank?
      errors += insert sorted_hashes[:insert], into:model unless sorted_hashes[:insert].blank?
    end 
    return errors
  rescue Exception => e
    return ((defined? errors) ? (errors << IndividualError.new(e,operation:"save")) : [IndividualError.new(e,operation:"save")])
  end
end

#slim_data(object_array, keep: [], operation: :save) ⇒ Object 



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# File 'lib/mass_record.rb', line 54

def slim_data object_array, keep:[], operation: :save
  return object_array if keep.blank? unless operation.to_s == 'update' or object_array.any?{|x| !x.new_record?}
  slimmed_objects = []

  object_array.each do |object|
    model = object.class
    created_at = model.attribute_alias?("created_at") ? model.attribute_alias("created_at") : "created_at"
    updated_at = model.attribute_alias?("updated_at") ? model.attribute_alias("updated_at") : "updated_at"

    # narrow the attributes to just the relevant ones
    keepers = object.attributes.select{|k,v| object.changed.include? k} if (operation.to_s == 'update' or !object.new_record?) and keep.blank?
    keepers = object.attributes.select{|k,v| keep.map(&:to_s).include? k} unless keep.blank?

    # also keep important fields primary key, and created and updated datestamps
    unless keepers.blank?
      keepers = keepers.merge(object.attributes.select{|k,v| (model.primary_key+[created_at,updated_at]).include? k}) if model.primary_key.is_a? Array
      keepers = keepers.merge(object.attributes.select{|k,v| [model.primary_key,created_at,updated_at].include? k}) unless model.primary_key.is_a? Array
    end

    slimmed_objects << keepers
  end

  return slimmed_objects
end

#sort_save_operations(from: nil, for_table: nil, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 318

def sort_save_operations from:nil, for_table:nil, key:{}
  return {} if from.blank? or for_table.blank?
  table = for_table
  hashes = from.select{|o| o[key[:table]] == table}.collect{|x| x[key[:object]]}
  model = get_model from:for_table
  connection = model.connection
  pk = model.primary_key

  # organize hashes based on whether they exist (based on their primary key(s)) in the table or not
  if pk.is_a? Array
    ids = hashes.reject{|x| pk.any?{|k| x[k].blank?}}.collect{|x| x.select{|k,v| pk.include? k}}  # only accept full sets of pk's
    where_clauses = []
    ids.each do |id|
      equivalence_clauses = []
      id.each do |k,v|
        equivalence_clauses << "#{k} = #{connection.quote(connection.type_cast(v, model.column_types[k]))}"
      end
      where_clauses << "(#{equivalence_clauses.join ' and '})"
    end
    existing_id_sets = model.find_by_sql("SELECT #{pk.join ', '} FROM #{model.table_name} WHERE #{where_clauses.join ' OR '}").collect{|x| x.attributes}  #.collect{|x| Hash[x.map.with_index{|x,i| [pk[i],x]}]}
    insert_hashes = hashes.reject{|h| existing_id_sets.any?{|set| h == h.merge(set)}}
    update_hashes = hashes.select{|h| existing_id_sets.any?{|set| h == h.merge(set)}}
  else
    ids = hashes.reject{|x| x[pk].blank?}.collect{|x| x[pk]}  # should not include null values
    existing_ids = model.find_by_sql("SELECT #{pk} FROM #{model.table_name} WHERE #{pk} in ('#{ids.join "','"}')").collect{|x| x[pk]} # for some reason model.connection.execute returns the count
    insert_hashes = hashes.reject{|x| existing_ids.include? x[pk].to_s}
    update_hashes = hashes.select{|x| existing_ids.include? x[pk].to_s}
  end

  return {insert:insert_hashes,update:update_hashes}
end

#specify_save(on: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 79

def specify_save on: nil
  return 'save' if on.blank?
  return (on.new_record? ? 'insert' : 'update') if on.is_a? ActiveRecord::Base
  return 'save'
end

#sql_for_insert(hash, into: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 395

def sql_for_insert hash, into:nil
  return nil if hash.blank? or into.blank?
  model = get_model from:into
  id_column_name = model.primary_key
  created_at = model.attribute_alias?("created_at") ? model.attribute_alias("created_at") : "created_at"
  updated_at = model.attribute_alias?("updated_at") ? model.attribute_alias("updated_at") : "updated_at"
  t = model.arel_table

  h = hash.clone # use a copy of hash, so it doesn't change the original data

  # assemble an individual query
  # im = Arel::InsertManager.new(ActiveRecord::Base)
  im = Arel::InsertManager.new(model)
  unless id_column_name.is_a? Array  # don't modify the id fields if there are concatenated primary keys
    database_column = model.columns.select{|x| x.name == id_column_name}.first
    h.delete id_column_name if h[id_column_name].blank? or (database_column.methods.include? :extra and database_column.extra == 'auto_increment')
  end
  h = convert_to_db_format h, model:model, created_at:created_at, updated_at:updated_at
  pairs = h.collect do |k,v|
    [t[k.to_sym],v]
  end
  im.insert pairs
  im.to_sql
end

#sql_for_update(hash, into: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 420

def sql_for_update hash, into:nil
  return nil if hash.blank? or into.blank?
  model = get_model from:into
  id_column_name = model.primary_key
  created_at = model.attribute_alias?("created_at") ? model.attribute_alias("created_at") : "created_at"
  updated_at = model.attribute_alias?("updated_at") ? model.attribute_alias("updated_at") : "updated_at"
  t = model.arel_table

  h = hash.clone # use a copy of hash, so it doesn't change the original data
  h = convert_to_db_format h, model:model, created_at:created_at, updated_at:updated_at

  # assemble an individual query
  # um = Arel::UpdateManager.new(ActiveRecord::Base)
  um = Arel::UpdateManager.new(model)
  um.where(t[id_column_name.to_sym].eq(h[id_column_name])) unless id_column_name.is_a? Array
  id_column_name.each{|key| um.where t[key.to_sym].eq(h[key])} if id_column_name.is_a? Array
  um.table(t)
  id_column_name.each{|name| h.delete name} if id_column_name.is_a? Array  # don't allow modification of the primary keys
  h.delete id_column_name if id_column_name.is_a? String           # don't allow modification of the primary keys
  pairs = h.collect do |k,v|
    [t[k.to_sym],v]
  end
  um.set pairs
  um.to_sql
end

#update(hashes, into: nil) ⇒ Object 



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# File 'lib/mass_record.rb', line 446

def update hashes, into:nil
  begin
    return false if hashes.blank? or into.blank?

    logger.debug "Update #{into.to_s}>".black.on_white
    hashes = [hashes] unless hashes.is_a? Array
    model = get_model from:into

    errors = []
    # create an array of single insert queries
    hashes.each do |hash|
      sql = sql_for_insert hash, into:model
  
      begin
        query sql, connection:model
        logger << ".".black.on_white if logger.debug?
        self.individual_count += 1
      rescue Exception => e
        logger.debug e.message
        logger.info e.message.to_s[0..1000]
        errors << IndividualError.new(e,table:into,operation:"update",json_object:hash)
      end
    end
    return errors
  rescue Exception => e
    return (defined? errors) ? (errors << IndividualError.new(e, table:into, operation:"update")) : [IndividualError.new( e, table:into, operation:"update")]
  end
end

#update_by_table(json_objects, key: {}) ⇒ Object 



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# File 'lib/mass_record.rb', line 303

def update_by_table json_objects, key:{}
  begin
    tables = json_objects.collect{|x| x[key[:table]]}.to_set.to_a

    errors = []
    tables.each do |table|
      hashes = json_objects.select{|o| o[key[:table]] == table}.collect{|x| x[key[:object]]}
      errors += update hashes, into:table
    end
    return errors
  rescue Exception => e
    return ((defined? errors) ? (errors << IndividualError.new(e,operation:"update")) : [IndividualError.new(e,operation:"update")])
  end
end