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A: In config/initializers/trestle.rb
set config.favicon = "favicon.ico"
A: In config/locales/en.yml
set en.admin.<model>.titles.index
(see issue). For instance if you model is called AuthorityCard
:
# config/locales/en.yml
en:
admin:
authority_cards:
breadcrumbs:
index: "Authority Cards"
titles:
index: "List of Authority cards"
table:
headers:
auth: "Authority"
Similarly, to rename the header_text
of a column in a resource admin table, set the translation for en.admin.<model>.table.headers.<column field name>
(see code).
A: You can remove default actions (e.g. create
, destroy
) from a resource like so:
Trestle.resource(:articles) do
remove_action :destroy
This will result in the delete button no longer being present on the index or show pages.
Note that if you want to remove the "New resource" button to prevent resources from being created, you should remove both :new
and :create
:
Trestle.resource(:articles) do
remove_action :new, :create
A: If you need to create a button that brings you to the resource in the "frontend" using the Rails routes you can use the follow (given model
is your admin instance):
# /app/admin/model_admin.rb
unless model.new_record?
concat content_tag(:hr)
concat link_to("Preview", Rails.application.routes.url_helpers.model_path(model), class: "btn btn-primary", target: :_blank)
end
A: To add separate admin_resources
create separate admin files and pass the model (Product in the example) as the model:
parameter:
# app/admin/test_product_admin.rb
Trestle.resource(:test_product, model: Product) do
...
end
# app/admin/real_product_admin.rb
Trestle.resource(:real_product, model: Product) do
...
end
Source: Issue 370
A: You can use the following
form do |item|
concat Trestle::Form::Automatic.new(admin).render(self, item)
# ... your additional fields/sidebar here ...
end
Note: This really concat
s the rendering output (html), so this approach does not work for tables.
Source: Issue 346
A: To show subsets of the collection you can add a scopes do
block to your Admin Resource which show as buttons which restrict the collection:
Trestle.resource(:projects) do
scopes do
scope 'Finished projects', -> { Project.where(status: 'finished') }
scope 'Active projects', -> { Project.where(status: 'active') }
scope 'My projects', -> { Project.where(user: current_user) }
end
end
Or more generically, if you have a model field which has a tag-like status
:
Trestle.resource(:projects) do
scopes do
Project.distinct.pluck(:status).each do |status|
scope status, -> { Project.where(status: status) }
end
end
...
You can group the scopes by passing a group
to the scope (see Issue 322):
Trestle.resource(:projects) do
scopes do
scope 'Finished', -> { Project.where(status: 'finished') }, group: 'Project status'
scope 'Active', -> { Project.where(status: 'active') }, group: 'Project status'
scope 'My projects', -> { Project.where(user: current_user) }, group: 'Other'
end
end
You can also pass additional options to the scopes
block to change the way the scopes are rendered:
The usage is effectively the same as in your example. Provide the group option on a scope to enable grouping, and additional options can be specified on the scopes call.
# By default scope groups are shown as rows. If `layout: :column` is passed, then groups are shown in columns.
scopes layout: :columns do
...
end
# Disable grouping regardless of scope definitions:
scopes group: false do
...
end
# Add custom html classes to the scopes block
scopes class: "scope-tags" do
...
end
A: Table definitions are available via the class method tables[:index]
on the Admin Resource and can be reused by calling the builder method table
with a name. For instance, if you want to create a tab in the admin view for the Project model, which shows the table from the TaskAdmin view:
Trestle.resource(:projects) do
form do |project|
# ...
tab :tasks, badge: project.tasks.size do
table TasksAdmin.tables[:index], collection: project.tasks # Re-use existing table from TasksAdmin
concat admin_link_to("New Task", admin: :tasks, action: :new, params: { project_id: project }, class: "btn btn-success")
end
end
end
This is equivalent to:
```ruby
Trestle.resource(:projects) do
form do |project|
tab :project do
text_field :name
text_area :description
end
tab :tasks, badge: project.tasks.size do
table project.tasks, admin: :tasks do
column :description, link: true
column :done, align: :center
column :created_at, align: :center
actions
end
concat admin_link_to("New Task", admin: :tasks, action: :new, params: { project_id: project }, class: "btn btn-success")
end
end
end
Note: This requires the top-level resource and table to be explicitly defined (an implicit table won't work):
Trestle.resource(:tasks) do
table do # This defines TasksAdmin.tables[:index]
column :description, link: true
column :done, align: :center
column :created_at, align: :center
actions
end
end
In many cases, your top-level table might include additional columns that you don't want to show on the sub-resource. In this you can define additional name tables on the top-level resource and reference them from the child resource.
Trestle.resource(:tasks) do
# Default table (:index)
table do
column :project
column :description, link: true
column :done, align: :center
column :created_at, align: :center
actions
end
# Named table
table :project do
column :description, link: true
column :done, align: :center
column :created_at, align: :center
actions
end
end
This keeps all of the table definitions in the one place.
Source: Issue 346
A: When you add a table do ... end
into your admin resource then the automatically generated columns will disappear. To get back to those default columns you can use the following code and copy the resulting text from your Rails log:
# /app/admin/<your model>_admin.rb
Trestle.resource(:<your model>) do
controller do
def index
print_table
end
def print_table
Rails.logger.silence do
puts "table do"
admin.default_table_attributes.map.with_index do |attribute, index|
case attribute.type
when :association
puts " column #{attribute.association_name.to_sym.inspect}, sort: false"
else
puts " column #{attribute.name.to_sym.inspect}#{", link: true" if index.zero?}#{", align: :center" if [:datetime, :boolean].include?(attribute.type)}"
end
end
puts " actions"
puts "end"
end
end
end
end
A: You can customize the items per page by adding paginates_per
20 to your model.
class Foo < ApplicationRecord
belongs_to :bar
paginates_per 20
end
A: By default Trestle will use the format_helper.rb to render a value. This allows for the following:
- You can pass options for
:currency
and:tags
to force rendering. - If the value is a ActiveModel instance (or more precisely something which responds to
:id
), the value is checked if it responds to one of the following methods (seeconfig.display_methods
):[:display_name, :full_name, :name, :title, :username, :login, :email]
If the objects responds, then this will be used as the value otherwiseto_s
is used. - You can adjust the value to be rendered by passing a block to the
column
definition where you make from the object instance being displayed in the current row to the value to display.