Class: BazaModels::Query

Inherits:
Object
  • Object
show all
Defined in:
lib/baza_models/query.rb

Defined Under Namespace

Classes: Inspector, Not

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ Query

Returns a new instance of Query.



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# File 'lib/baza_models/query.rb', line 11

def initialize(args)
  @args = args
  @model = @args[:model]
  @db = @model.db

  raise "No database?" unless @db

  @selects = args[:selects] || []
  @wheres = args[:wheres] || []
  @includes = args[:includes] || []
  @joins = args[:joins] || []
  @groups = args[:groups] || []
  @orders = args[:orders] || []
  @limit = args[:limit]

  @joins_tracker = {}
end

Instance Attribute Details

#_previous_model ⇒ Object

Returns the value of attribute _previous_model.



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# File 'lib/baza_models/query.rb', line 9

def _previous_model
  @_previous_model
end

#_relation ⇒ Object

Returns the value of attribute _relation.



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# File 'lib/baza_models/query.rb', line 9

def _relation
  @_relation
end

Instance Method Details

#<<(model) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 372

def <<(model)
  raise "No previous model set" unless @_previous_model
  raise "No relation" unless @_relation

  if model.persisted?
    model.update_attributes!(@_relation.fetch(:foreign_key) => @_previous_model.id)
  else
    autoloaded_cache_or_create << model
  end

  self
end

#<=(_other) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 390

def <=(_other)
  false
end

#accessible_by(ability, action = :index) ⇒ Object

CanCan supports



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# File 'lib/baza_models/query.rb', line 386

def accessible_by(ability, action = :index)
  ability.model_adapter(self, action).database_records
end

#all ⇒ Object 



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# File 'lib/baza_models/query.rb', line 29

def all
  self
end

#any? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza_models/query.rb', line 33

def any?
  if @db.query(clone.select(:id).limit(1).to_sql).fetch
    return true
  else
    return false
  end
end

#count ⇒ Object 



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# File 'lib/baza_models/query.rb', line 49

def count
  if @_previous_model && @_previous_model.new_record?
    return autoloaded_cache_or_create.length
  else
    query = clone

    query.instance_variable_set(:@selects, [])
    query = clone.select("COUNT(*) AS count")

    @db.query(query.to_sql).fetch.fetch(:count)
  end
end

#destroy_all ⇒ Object 



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# File 'lib/baza_models/query.rb', line 360

def destroy_all
  each(&:destroy!)
end

#each ⇒ Object 



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# File 'lib/baza_models/query.rb', line 243

def each
  to_enum.each do |model|
    yield model
  end
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza_models/query.rb', line 41

def empty?
  !any?
end

#find(id) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 66

def find(id)
  model = clone.where(id: id).limit(1).to_enum.first

  if model
    model.__send__(:fire_callbacks, :after_find)
  else
    raise BazaModels::Errors::RecordNotFound
  end

  model
end

#find_by(args) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 78

def find_by(args)
  clone.where(args).limit(1).to_enum.first
end

#find_each ⇒ Object 



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# File 'lib/baza_models/query.rb', line 249

def find_each
  query = clone
  query.instance_variable_set(:@order, [])
  query.instance_variable_set(:@limit, nil)
  query = query.order(:id)

  offset = 0

  loop do
    query = query.offset(offset, 1000)
    offset += 1000

    count = 0
    query.each do |model|
      yield model
      count += 1
    end

    break if count == 0
  end
end

#find_first(args) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 271

def find_first(args)
  clone.where(args).first
end

#first ⇒ Object 



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# File 'lib/baza_models/query.rb', line 82

def first
  return autoloaded_cache.first if should_use_autoload?

  query = clone.limit(1)

  orders = query.instance_variable_get(:@orders)
  query = query.order(:id) if orders.empty?

  query.to_enum.first
end

#group(name) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 183

def group(name)
  if name.is_a?(Symbol)
    @groups << "`#{@model.table_name}`.`#{name}`"
  elsif name.is_a?(String)
    @groups << name
  else
    raise "Didn't know how to group by that argument: #{name}"
  end

  self
end

#includes(name) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 128

def includes(name)
  @includes << name
  self
end

#inspect ⇒ Object 



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# File 'lib/baza_models/query.rb', line 368

def inspect
  to_s
end

#joins(*arguments) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 171

def joins(*arguments)
  BazaModels::Query::Inspector.new(
    query: self,
    model: @model,
    argument: arguments,
    joins: @joins,
    joins_tracker: @joins_tracker
  ).execute

  self
end

#last ⇒ Object 



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# File 'lib/baza_models/query.rb', line 93

def last
  return autoloaded_cache.last if should_use_autoload?

  query = clone.limit(1)

  orders = query.instance_variable_get(:@orders)
  query = query.order(:id) if orders.empty?

  query.reverse_order.to_enum.first
end

#length ⇒ Object 



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# File 'lib/baza_models/query.rb', line 62

def length
  count
end

#limit(limit) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 123

def limit(limit)
  @limit = limit
  self
end

#map(&blk) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 212

def map(&blk)
  to_enum.map(&blk)
end

#none? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/baza_models/query.rb', line 45

def none?
  !any?
end

#offset(offset) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 118

def offset(offset)
  @offset = offset
  self
end

#order(name) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 195

def order(name)
  if name.is_a?(Symbol)
    @orders << "`#{@model.table_name}`.`#{name}`"
  elsif name.is_a?(String)
    @orders << name
  else
    raise "Didn't know how to order by that argument: #{name}"
  end

  self
end

#page(some_page) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 399

def page(some_page)
  some_page ||= 1
  offset = (some_page.to_i - 1) * per

  clone.offset(offset).limit(30)
end

#per ⇒ Object 



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# File 'lib/baza_models/query.rb', line 406

def per
  @per ||= 30
end

#reverse_order ⇒ Object 



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# File 'lib/baza_models/query.rb', line 207

def reverse_order
  @reverse_order = true
  self
end

#sanitize_sql(value) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 394

def sanitize_sql(value)
  return value if value.is_a?(Array) || value.is_a?(Integer) || value.is_a?(Integer)
  "'#{@db.esc(value)}'"
end

#select(select = nil, &blk) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 104

def select(select = nil, &blk)
  if !select && blk
    to_enum.select(&blk)
  else
    if select.is_a?(Symbol)
      @selects << "`#{@model.table_name}`.`#{select}`"
    else
      @selects << select
    end

    self
  end
end

#to_a ⇒ Object 



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# File 'lib/baza_models/query.rb', line 275

def to_a
  to_enum.to_a
end

#to_enum ⇒ Object 



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# File 'lib/baza_models/query.rb', line 216

def to_enum
  return autoloaded_cache if should_use_autoload?

  array_enum = ArrayEnumerator.new do |yielder|
    @db.query(to_sql).each do |data|
      yielder << @model.new(data, init: true)
    end
  end

  if @includes.empty?
    return array_enum
  else
    array = array_enum.to_a

    if @includes.any? && array.any?
      autoloader = BazaModels::Autoloader.new(
        models: array,
        autoloads: @includes,
        db: @db
      )
      autoloader.autoload
    end

    return array
  end
end

#to_s ⇒ Object 



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# File 'lib/baza_models/query.rb', line 364

def to_s
  "#<BazaModels::Query class=#{@model.name} wheres=#{@wheres}>"
end

#to_sql ⇒ Object 



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# File 'lib/baza_models/query.rb', line 279

def to_sql
  sql = "SELECT "

  if @selects.empty?
    sql << "`#{@model.table_name}`.*"
  else
    sql << @selects.join(", ")
  end

  sql << " FROM `#{@model.table_name}`"

  unless @joins.empty?
    @joins.each do |join|
      sql << " #{join}"
    end
  end

  unless @wheres.empty?
    sql << " WHERE "

    first = true
    @wheres.each do |where|
      if first == true
        first = false
      else
        sql << " AND "
      end

      sql << where
    end
  end

  unless @groups.empty?
    sql << " GROUP BY "

    first = true
    @groups.each do |group|
      if first
        first = false
      else
        sql << ", "
      end

      sql << group
    end
  end

  unless @orders.empty?
    sql << " ORDER BY "

    first = true
    @orders.each do |order|
      if first
        first = false
      else
        sql << ", "
      end

      if @reverse_order
        if order.match(/\s+desc/i)
          order = order.gsub(/\s+desc/i, " ASC")
        elsif order.match(/\s+asc/i)
          order = order.gsub(/\s+asc/i, " DESC")
        else
          order = "#{order} DESC"
        end
      end

      sql << order
    end
  end

  if @limit && @offset
    sql << " LIMIT #{@offset.to_i}, #{@limit.to_i}"
  elsif @limit
    sql << " LIMIT #{@limit.to_i}"
  end

  sql.strip
end

#total_pages ⇒ Object 



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# File 'lib/baza_models/query.rb', line 410

def total_pages
  pages_count = (count.to_f / @per.to_f)
  pages_count = 1 if pages_count.nan? || pages_count == Float::INFINITY
  pages_count = pages_count.to_i
  pages_count = 1 if pages_count == 0
  pages_count
end

#where(args = nil) ⇒ Object 



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# File 'lib/baza_models/query.rb', line 133

def where(args = nil)
  if args.is_a?(String)
    @wheres << "(#{args})"
  elsif args.is_a?(Array)
    str = args.shift

    args.each do |arg|
      if arg.is_a?(Symbol)
        arg = "`#{@model.table_name}`.`#{@db.escape_column(arg)}`"
      elsif arg.is_a?(FalseClass)
        arg = "0"
      elsif arg.is_a?(TrueClass)
        arg = "1"
      else
        arg = @db.sqlval(arg)
      end

      str.sub!("?", arg)
    end

    @wheres << "(#{str})"
  elsif args == nil
    return Not.new(query: self)
  else
    args.each do |key, value|
      if value.is_a?(Hash)
        value.each do |hash_key, hash_value|
          @wheres << "`#{key}`.`#{key_convert(hash_key, hash_value)}` = #{@db.sqlval(value_convert(hash_value))}"
        end
      else
        @wheres << "`#{@model.table_name}`.`#{key_convert(key, value)}` = #{@db.sqlval(value_convert(value))}"
      end
    end
  end

  self
end