WiceGrid 3.6.0.pre4 examples

Custom filters (joined tables)

There are two approaches to custom filters with joined tables. The first thing that comes to mind is to define a column of a joined table with :attribute and :assoc , and submit a list of all possible values of this column to :custom_filter , like it is done in the example below in the Priority column:

g.column name: 'Priority', attribute: 'name', assoc: :priority, custom_filter: %w(Anecdotic High Low Normal Urgent) do |task|

This works but such a filter produces a query with a WHERE clause comparing a varchar field with one of the string values submitted to :custom_filter . This is not guaranteed to be as efficient as comparing an indexed integer foreign key with an integer primary key, thus, this approach is highly advised against.

To implement filtering by foreign keys, define the column with the foreign key in :attribute and submit a hash or a two element array containing the IDs and labels of the joined table to :attribute . This has a negative side effect on sorting - the column will now be sorted according to the numerical value of the foreign key. It can be dealt with by overiding sorting by :custom_order in initialize_grid :

custom_order: {'tasks.status_id' => 'statuses.position', 'tasks.project_id' => 'projects.name'}

  • # encoding: utf-8
    class CustomFilters2Controller < ApplicationController
      def index
        @tasks_grid = initialize_grid(Task,
          include: [:priority, :status, :project],
          order: 'statuses.name',
          custom_order: {
            # 'tasks.priority_id' => 'priorities.name',
            'tasks.status_id'   => 'statuses.position',
            'tasks.project_id'  => 'projects.name'
          }
        )
      end
    end
    
  • <%= grid(@tasks_grid) do |g|
    
      g.column name:  'ID', attribute: 'id', filter: false
    
      g.column name:  'Title', attribute: 'title'
    
      g.column name:  'Priority', attribute: 'name', assoc: :priority, custom_filter: %w(Anecdotic High Low Normal Urgent) do |task|
        task.priority.name if task.priority
      end
    
      g.column name:  'Status', attribute: 'status_id',  custom_filter: Status.to_dropdown  do |task|
        task.status.name if task.status
      end
    
      g.column name:  'Project Name', attribute: 'project_id', custom_filter: Project.to_dropdown do |task|
        task.project.name if task.project
      end
    
      g.column  name:  'Archived', attribute: 'archived' do |task|
        task.archived? ? 'Yes' : 'No'
      end
    
      g.column name:  'Added', attribute: 'created_at' do |task|
        task.created_at.to_s(:short)
      end
    
      g.column   do |task|
        link_to('Edit', edit_task_path(task))
      end
    end -%>
  • .well
      %h2= current_page_title
      %p
        There are two approaches to custom filters with joined tables. The first thing that comes to mind is to define
        a column of a joined table with
        %code :attribute
        and
        %code :assoc
        , and submit a list of all possible values of this column to
        %code :custom_filter
        , like it is done in the example below in the Priority column:
      %p
        %code g.column name:  'Priority', attribute: 'name', assoc: :priority, custom_filter: %w(Anecdotic High Low Normal Urgent) do |task|
    
      %p
        This works but such a filter produces a query with a
        %code WHERE
        clause comparing a varchar field with one of the string values submitted to
        %code :custom_filter
        \.
        This is not guaranteed to be as efficient as comparing an indexed integer foreign key with an integer primary key, thus, this approach is highly advised against.
      %p
        To implement filtering by foreign keys, define the column with the foreign key in
        %code :attribute
        and submit a hash or a two element array containing the IDs and labels of the joined table to
        %code :attribute
        \.
        This has a negative side effect on sorting - the column will now be sorted according to the numerical value of the foreign key.
        It can be dealt with by overiding sorting by
        %code :custom_order
        in
        %code initialize_grid
        \:
      %p
        %code custom_order: {'tasks.status_id' => 'statuses.position', 'tasks.project_id' => 'projects.name'}
    
    = show_code
    
    .row-fluid
      .col-md-12
        = render   'grid'
IDTitlePriorityStatusProject NameArchived Added

41-60 / 500 Voir tous
42autHighCancelledUltimate WebsiteNo08 Apr 12:37Edit
21et rerum laborumCancelledSuper GameNo19 Mar 12:37Edit
44id temporibus eligendiAssignedUltimate WebsiteNo27 Mar 12:37Edit
45rerumNormalPostponedDivine FirmwareNo15 Jun 12:37Edit
23exercitationem autAnecdoticClosedDivine FirmwareNo23 Apr 12:37Edit
47temporibus iure delectusLowCancelledUltimate WebsiteNo22 Apr 12:37Edit
48qui inciduntLowCancelledDivine FirmwareNo04 Apr 12:37Edit
49laborumHighNewUltimate WebsiteNo30 Apr 12:37Edit
50ipsum nam temporeUrgentDuplicateSuper GameNo10 Apr 12:37Edit
51harum qui possimusAnecdoticCancelledDivine FirmwareNo26 Apr 12:37Edit
52eos temporibus omnisLowResolvedSuper GameNo13 Mar 12:37Edit
53molestiaeAssignedSuper GameNo21 Apr 12:37Edit
54minima in voluptatemNormalPostponedUltimate WebsiteNo29 May 12:37Edit
55dolorLowCancelledSuper GameNo11 Jun 12:37Edit
56sitLowVerifiedSuper GameNo11 May 12:37Edit
57nequeNormalPostponedDivine FirmwareNo19 Mar 12:37Edit
58atque etAnecdoticStartedDivine FirmwareNo28 May 12:37Edit
59alias liberoUrgentStartedUltimate WebsiteNo23 Mar 12:37Edit
60voluptas repellendusStartedUltimate WebsiteNo02 Jun 12:37Edit
68exercitationem delectusNormalPostponedDivine FirmwareNo12 May 12:37Edit

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