Class: Wice::WiceGrid

Inherits:
Object show all
Defined in:
lib/wice_grid.rb

Overview

Main class responsible for keeping the state of the grid, building an ActiveRelation, and running queries

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(klass_or_relation, controller, opts = {}) ⇒ WiceGrid

core workflow methods START

Raises:



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# File 'lib/wice_grid.rb', line 77

def initialize(klass_or_relation, controller, opts = {})  #:nodoc:
  @controller = controller

  @relation = klass_or_relation
  @klass = if @relation.is_a?(Class) && @relation.ancestors.index(ActiveRecord::Base)
    klass_or_relation
  else
    klass_or_relation.klass
  end

  unless @klass.is_a?(Class) && @klass.ancestors.index(ActiveRecord::Base)
    raise WiceGridArgumentError.new('ActiveRecord model class (second argument) must be a Class derived from ActiveRecord::Base')
  end

  # validate :with_resultset & :with_paginated_resultset
  [:with_resultset, :with_paginated_resultset].each do |callback_symbol|
    unless [NilClass, Symbol, Proc].index(opts[callback_symbol].class)
      raise WiceGridArgumentError.new(":#{callback_symbol} must be either a Proc or Symbol object")
    end
  end

  opts[:order_direction] = opts[:order_direction].downcase if opts[:order_direction].is_a?(String)

  # validate :order_direction
  if opts[:order_direction] && ! (opts[:order_direction] == 'asc' || opts[:order_direction] == :asc || opts[:order_direction] == 'desc' ||
                                  opts[:order_direction] == :desc)
    raise WiceGridArgumentError.new(":order_direction must be either 'asc' or 'desc'.")
  end

  begin
    # options that are understood
    @options = {
      conditions:                 nil,
      csv_file_name:              nil,
      csv_field_separator:        ConfigurationProvider.value_for(:CSV_FIELD_SEPARATOR),
      csv_encoding:               ConfigurationProvider.value_for(:CSV_ENCODING),
      custom_order:               {},
      enable_export_to_csv:       ConfigurationProvider.value_for(:ENABLE_EXPORT_TO_CSV),
      group:                      nil,
      include:                    nil,
      joins:                      nil,
      name:                       ConfigurationProvider.value_for(:GRID_NAME),
      order:                      nil,
      order_direction:            ConfigurationProvider.value_for(:ORDER_DIRECTION),
      page:                       1,
      page_method_name:           ConfigurationProvider.value_for(:PAGE_METHOD_NAME),
      per_page:                   ConfigurationProvider.value_for(:PER_PAGE),
      saved_query:                nil,
      with_paginated_resultset:   nil,
      with_resultset:             nil,
      use_default_scope:          ConfigurationProvider.value_for(:USE_DEFAULT_SCOPE)
    }
  rescue NameError
    raise NameError.new('A constant is missing in wice_grid_config.rb: ' + $ERROR_INFO.message +
      '. This can happen when you upgrade the WiceGrid to a newer version with a new configuration constant. ' \
      'Add the constant manually or re-run `bundle exec rails g wice_grid:install`.')
  end
  # validate parameters
  opts.assert_valid_keys(@options.keys)

  @options.merge!(opts)
  @export_to_csv_enabled = @options[:enable_export_to_csv]
  @csv_file_name = @options[:csv_file_name]
  @csv_field_separator = @options[:csv_field_separator]
  @csv_encoding = @options[:csv_encoding]

  case @name = @options[:name]
  when String
  when Symbol
    @name = @name.to_s
  else
    raise WiceGridArgumentError.new('name of the grid should be a string or a symbol')
  end
  raise WiceGridArgumentError.new('name of the grid can only contain alphanumeruc characters') unless @name =~ /^[a-zA-Z\d_]*$/

  @table_column_matrix = TableColumnMatrix.new
  @table_column_matrix.default_model_class = @klass

  @ar_options = {}
  @status = HashWithIndifferentAccess.new

  if @options[:order]
    @options[:order]           = @options[:order].to_s
    @options[:order_direction] = @options[:order_direction].to_s

    @status[:order_direction]  = @options[:order_direction]
    @status[:order]            = @options[:order]

  end
  @status[:per_page]      = @options[:per_page]
  @status[:page]          = @options[:page]
  @status[:conditions]    = @options[:conditions]
  @status[:f]             = @options[:f]

  process_loading_query
  process_params

  @ar_options_formed = false
end

Instance Attribute Details

#ar_options ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def ar_options
  @ar_options
end

#csv_encoding ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def csv_encoding
  @csv_encoding
end

#csv_field_separator ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def csv_field_separator
  @csv_field_separator
end

#csv_file_name ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def csv_file_name
  @csv_file_name
end

#csv_tempfile ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 73

def csv_tempfile
  @csv_tempfile
end

#custom_order ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 70

def custom_order
  @custom_order
end

#export_to_csv_enabled ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def export_to_csv_enabled
  @export_to_csv_enabled
end

#klass ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 70

def klass
  @klass
end

#name ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 70

def name
  @name
end

#output_buffer ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 73

def output_buffer
  @output_buffer
end

#query_store_model ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 70

def query_store_model
  @query_store_model
end

#renderer=(value) ⇒ Object (writeonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 72

def renderer=(value)
  @renderer = value
end

#resultset ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 70

def resultset
  @resultset
end

#saved_query ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def saved_query
  @saved_query
end

#status ⇒ Object (readonly)

:nodoc:



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# File 'lib/wice_grid.rb', line 71

def status
  @status
end

#view_helper_finished ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 73

def view_helper_finished
  @view_helper_finished
end

Instance Method Details

#add_references(relation) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 335

def add_references(relation) #:nodoc:
  if @ar_options[:include] && relation.respond_to?(:references)
    # refs = [@ar_options[:include]] unless @ar_options[:include].is_a?(Array)
    relation = relation.references(* @ar_options[:include])
  end
  relation
end

#all_pages_records ⇒ Object

Returns the list of objects browsable through all pages with the current filters. Should only be called after the grid helper.

Raises:



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# File 'lib/wice_grid.rb', line 537

def all_pages_records
  raise WiceGridException.new('all_pages_records can only be called only after the grid view helper') unless self.view_helper_finished
  resultset_without_paging_with_user_filters
end

#all_record_mode? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 526

def all_record_mode? #:nodoc:
  @status[:pp]
end

#apply_sort_by(relation) ⇒ Object

Apply the sort_by option to the results.



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# File 'lib/wice_grid.rb', line 344

def apply_sort_by(relation)
  active_sort_by = nil
  @renderer.find_one_for(->(c) {c.attribute == @status[:order]}) {|r| active_sort_by = r.sort_by}
  return relation if !active_sort_by
  relation = relation.sort_by(&active_sort_by)
  relation = relation.reverse if @status[:order_direction] == 'desc'
  return relation
end

#count ⇒ Object Also known as: size

:nodoc:



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# File 'lib/wice_grid.rb', line 472

def count  #:nodoc:
  form_ar_options(skip_ordering: true, forget_generated_options: true)
  do_count
end

#current_page_records ⇒ Object

Returns the list of objects displayed on current page. Should only be called after the grid helper.

Raises:



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# File 'lib/wice_grid.rb', line 543

def current_page_records
  raise WiceGridException.new('current_page_records can only be called only after the grid view helper') unless self.view_helper_finished
  @resultset
end

#declare_column(column_name: nil, model: nil, custom_filter_active: nil, table_alias: nil, filter_type: nil, assocs: [], sort_by: nil) ⇒ Object

declare_column(String, ActiveRecord, CustomFilterSpec, nil | string, nil | Boolean)



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# File 'lib/wice_grid.rb', line 225

def declare_column(
             column_name: nil,
             model: nil,
             custom_filter_active: nil,
             table_alias: nil,
             filter_type: nil,
             assocs: [],
             sort_by: nil)  #:nodoc:


  @options[:include] = Wice.build_includes(@options[:include], assocs)

  if model # this is an included table
    column = @table_column_matrix.get_column_by_model_class_and_column_name(model, column_name)
    raise WiceGridArgumentError.new("Column '#{column_name}' is not found in table '#{model.table_name}'!") if column.nil?
    main_table = false
    table_name = model.table_name
  else
    column = @table_column_matrix.get_column_in_default_model_class_by_column_name(column_name)
    # Allow the column to not exist if we're doing a custom sort (calculated field)
    if column.nil? && !sort_by
      raise WiceGridArgumentError.new("Column '#{column_name}' is not found in table '#{@klass.table_name}'! " \
        "If '#{column_name}' belongs to another table you should declare it in :include or :join when initialising " \
        'the grid, and specify :model in column declaration.')
    end
    main_table = true
    table_name = @table_column_matrix.default_model_class.table_name
  end

  if column
    conditions_generator = ActiveRecordColumnWrapper.new(column, @status[:f], main_table, table_alias, custom_filter_active, filter_type)
    conditions, current_parameter_name = conditions_generator.wg_initialize_request_parameters

    if @status[:f] && conditions.blank?
      @status[:f].delete(current_parameter_name)
    end

    @table_column_matrix.add_condition(column, conditions)

    # [ActiveRecord::ConnectionAdapters::AbstractMysqlAdapter::Column, String, Boolean]
    [column, table_name, main_table]
  end
end

#distinct_values_for_column(column) ⇒ Object

with this variant we get even those values which do not appear in the resultset



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# File 'lib/wice_grid.rb', line 494

def distinct_values_for_column(column)  #:nodoc:
  column.model.select("distinct #{column.name}").order("#{column.name} asc").collect do|ar|
    ar[column.name]
  end.reject(&:blank?).map { |i| [i, i] }
end

#distinct_values_for_column_in_resultset(messages) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 500

def distinct_values_for_column_in_resultset(messages)  #:nodoc:
  uniq_vals = Set.new

  resultset_without_paging_without_user_filters.each do |ar|
    v = ar.deep_send(*messages)
    uniq_vals << v unless v.nil?
  end
  uniq_vals.to_a.map do|i|
    if i.is_a?(Array) && i.size == 2
      i
    elsif i.is_a?(Hash) && i.size == 1
      i.to_a.flatten
    else
      [i, i]
    end
  end.sort { |a, b| a[0] <=> b[0] }
end

#do_count ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 477

def do_count #:nodoc:
  @relation
    .all
    .joins(@ar_options[:joins])
    .includes(@ar_options[:include])
    .group(@ar_options[:group])
    .where(@options[:conditions])
    .count
end

#dump_status ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 530

def dump_status #:nodoc:
  "   params: #{params[name].inspect}\n" + "   status: #{@status.inspect}\n" \
    "   ar_options #{@ar_options.inspect}\n"
end

#each ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 407

def each   #:nodoc:
  self.read unless @resultset # database querying is late!
  @resultset.each do |r|
    yield r
  end
end

#empty? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 489

def empty?  #:nodoc:
  self.count == 0
end

#filter_params(view_column) ⇒ Object

Getters



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# File 'lib/wice_grid.rb', line 393

def filter_params(view_column)  #:nodoc:
  column_name = view_column.attribute_name_fully_qualified_for_all_but_main_table_columns
  if @status[:f] && @status[:f][column_name]
    @status[:f][column_name]
  else
    {}
  end
end

#filtered_by ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 436

def filtered_by  #:nodoc:
  @status[:f].nil? ? [] : @status[:f].keys
end

#filtered_by?(view_column) ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 440

def filtered_by?(view_column)  #:nodoc:
  @status[:f].nil? ? false : @status[:f].key?(view_column.attribute_name_fully_qualified_for_all_but_main_table_columns)
end

#filtering_on? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 432

def filtering_on?  #:nodoc:
  !@status[:f].blank?
end

#form_ar_options(opts = {}) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 269

def form_ar_options(opts = {})  #:nodoc:
  return if @ar_options_formed
  @ar_options_formed = true unless opts[:forget_generated_options]

  # validate @status[:order_direction]
  @status[:order_direction] = case @status[:order_direction]
  when /desc/i
    'desc'
  when /asc/i
    'asc'
  else
    ''
  end

  # conditions
  # do not delete for a while
  # https://github.com/leikind/wice_grid/issues/144
  # if @table_column_matrix.generated_conditions.size == 0
  #   @status.delete(:f)
  # end

  initial_conditions_active_relation = @klass.where(@status[:conditions])

  @ar_options[:conditions] =
    @table_column_matrix.conditions.reduce(initial_conditions_active_relation) do |active_relation_accu, cond|
      conditions_active_relation = @klass.where(cond)
      active_relation_accu.merge(conditions_active_relation)
    end

  # conditions processed

  if (!opts[:skip_ordering]) && ! @status[:order].blank?
    custom_order = get_custom_order_reference
    if custom_order
      @ar_options[:order] = custom_order
    else
      @ar_options[:order] = arel_column_reference(@status[:order])
    end
    if @ar_options[:order].is_a?(Arel::Attributes::Attribute)
      if @status[:order_direction] == 'desc'
        @ar_options[:order] = @ar_options[:order].desc
      else
        @ar_options[:order] = @ar_options[:order].asc
      end
    else
      @ar_options[:order] += " #{@status[:order_direction]}"
    end
  end

  @ar_options[:joins]   = @options[:joins]
  @ar_options[:include] = @options[:include]
  @ar_options[:group]   = @options[:group]

  if self.output_html?
    @ar_options[:per_page]      = @status[:per_page]
    @ar_options[:page]          = @status[:page]

    if (show_all_limit = Wice::ConfigurationProvider.value_for(:SHOW_ALL_ALLOWED_UP_TO, strict: false)) && all_record_mode?
      if do_count > show_all_limit # force-reset SHOW-ALL to pagination
        @status[:pp] = nil
      end
    end

  end
end

#get_state_as_parameter_value_pairs(including_saved_query_request = false) ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 444

def get_state_as_parameter_value_pairs(including_saved_query_request = false) #:nodoc:
  res = []
  unless status[:f].blank?
    Wice::WgHash.parameter_names_and_values(status[:f], [name, 'f']).collect do |param_name, value|
      if value.is_a?(Array)
        param_name_ar = param_name + '[]'
        value.each do |v|
          res << [param_name_ar, v]
        end
      else
        res << [param_name, value]
      end
    end
  end

  if including_saved_query_request && @saved_query
    res << ["#{name}[q]", @saved_query.id]
  end

  [:order, :order_direction].select do|parameter|
    status[parameter]
  end.collect do |parameter|
    res << ["#{name}[#{parameter}]", status[parameter]]
  end

  res
end

#order_direction ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 428

def order_direction  #:nodoc:
  @status[:order_direction]
end

#ordered_by ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 424

def ordered_by  #:nodoc:
  @status[:order]
end

#ordered_by?(column) ⇒ Boolean

Returns true if the current results are ordered by the passed column.

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 415

def ordered_by?(column)
  return nil if @status[:order].blank?
  if column.main_table && ! @status[:order].index('.') || column.table_alias_or_table_name.nil?
    @status[:order] == column.attribute
  else
    @status[:order] == column.table_alias_or_table_name + '.' + column.attribute
  end
end

#output_csv? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 518

def output_csv? #:nodoc:
  @status[:export] == 'csv'
end

#output_html? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/wice_grid.rb', line 522

def output_html? #:nodoc:
  @status[:export].blank?
end

#process_loading_query ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 190

def process_loading_query #:nodoc:
  @saved_query = nil
  if params[name] && params[name][:q]
    @saved_query = load_query(params[name][:q])
    params[name].delete(:q)
  elsif @options[:saved_query]
    if @options[:saved_query].is_a? ActiveRecord::Base
      @saved_query = @options[:saved_query]
    else
      @saved_query = load_query(@options[:saved_query])
    end
  else
    return
  end

  unless @saved_query.nil?
    params[name] = HashWithIndifferentAccess.new if params[name].blank?
    [:f, :order, :order_direction].each do |key|
      if @saved_query.query[key].blank?
        params[name].delete(key)
      else
        params[name][key] = @saved_query.query[key]
      end
    end
  end
end

#process_params ⇒ Object

:nodoc:



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# File 'lib/wice_grid.rb', line 217

def process_params  #:nodoc:
  if this_grid_params
    @status.merge!(this_grid_params)
    @status.delete(:export) unless self.export_to_csv_enabled
  end
end

#read ⇒ Object

TO DO: what to do with other @ar_options values?



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# File 'lib/wice_grid.rb', line 354

def read  #:nodoc:
  form_ar_options
  use_default_or_unscoped do
    relation = @relation
                   .includes(@ar_options[:include])
                   .joins(@ar_options[:joins])
                   .group(@ar_options[:group])
                   .merge(@ar_options[:conditions])
    relation = add_references relation
    relation = apply_sort_by relation

    # If relation is an Array, it got the sort from apply_sort_by.
    relation = relation.order(@ar_options[:order]) if !relation.is_a?(Array)

    if !output_csv? && !all_record_mode?
      if relation.is_a?(Array)
        relation = Kaminari.paginate_array(relation, limit: @ar_options[:per_page], offset: @ar_options[:per_page].to_i * (@ar_options[:page].to_i - 1))
      else
        relation = relation
                       .send(@options[:page_method_name], @ar_options[:page])
                       .per(@ar_options[:per_page])
      end
    end

    if all_record_mode? && relation.is_a?(Array)
      # This still needs to be a Kaminari object as the paginator will read limit_value.
      relation = Kaminari.paginate_array(relation, limit: relation.count)
    end

    @resultset = relation
  end

  invoke_resultset_callbacks
end

#with_paginated_resultset(&callback) ⇒ Object

A block executed from within the plugin to process records of the current page. The argument to the callback is the array of the records. See the README for more details.



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# File 'lib/wice_grid.rb', line 179

def with_paginated_resultset(&callback)
  @options[:with_paginated_resultset] = callback
end

#with_resultset(&callback) ⇒ Object

A block executed from within the plugin to process all records browsable through all pages with the current filters. The argument to the callback is a lambda object which returns the list of records when called. See the README for the explanation.



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# File 'lib/wice_grid.rb', line 186

def with_resultset(&callback)
  @options[:with_resultset] = callback
end