View Source ExTeal.Field behaviour (ExTeal v0.27.0)
The core struct that represents a field on a resource served by ExTeal.
Summary
Functions
Override the default filter for the field.
Use a getter function to display a computed field on the resource.
Define the options for the select field. The function accepts a list of
options that are either strings or maps with of value and label keys. If
the list members are strings, the value will be used for both the value and label
of the <option> element it represents.
Mark a field as virtual, which will update how teal queries the database for the field.
Types
@type t() :: %ExTeal.Field{ as_html: term(), attribute: term(), can_see: term(), component: term(), embed_field: term(), field: term(), filterable: term(), getter: term(), name: term(), options: term(), panel: term(), pivot_field: term(), prefix_component: term(), private_options: term(), relationship: term(), sanitize: term(), show_on_detail: term(), show_on_edit: term(), show_on_index: term(), show_on_new: term(), sortable: term(), stacked: term(), text_align: term(), type: term(), value: term(), virtual: term() }
Callbacks
@callback default_sortable() :: boolean()
@callback filterable_as() :: ExTeal.FieldFilter.valid_type()
@callback sanitize_as() :: atom() | false
Functions
Override the default filter for the field.
Use a getter function to display a computed field on the resource.
The getter function is given a schema and expects a string result
Define the options for the select field. The function accepts a list of
options that are either strings or maps with of value and label keys. If
the list members are strings, the value will be used for both the value and label
of the <option> element it represents.
options are expected to be an enumerable which will be used to generate
each respective option. The enumerable may have:
keyword lists - each keyword list is expected to have the keys
:keyand:value. Additional keys such as:disabledmay be given to customize the optiontwo-item tuples - where the first element is an atom, string or integer to be used as the option label and the second element is an atom, string or integer to be used as the option value
atom, string or integer - which will be used as both label and value for the generated select
Optgroups
If options is a map or keyword list where the firs element is a string, atom,
or integer and the second element is a list or a map, it is assumed the key
will be wrapped in an <optgroup> and teh value will be used to generate
<options> nested under the group. This functionality is only handled in the UI for
select fields, boolean groups will not respond.
This functionality is equivalent to Phoenix.HTML.Form.select/3
Mark a field as virtual, which will update how teal queries the database for the field.
This is relevant for fields that are based on schemaless queries in resources that represent complex queries in read-only situations. For example, if a resource has a records definition like:
from(p in "posts", select: %{user_id: p.user_id, count: count(p.id)}, group_by: p.user_id)Sorting by that resource would fail without marking the Number.make(:count) field as
virtual. Virtual fields allow Teal to sort by computed fields that are not backed
by a direct database reference, assuming the field is named with Ecto.Query.API.selected_as/2:
from(
p in "posts",
select: %{user_id: p.user_id, count: p.id |> count() |> selected_as(:count)},
group_by: p.user_id
)A resource can then use Number.make(:count) |> Field.virtual() to mark the field as virtual.