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0.1.0
The PostgreSQL data layer for Ash Framework
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Files
lib/predicates/trigram.ex
defmodule AshPostgres.Predicates.Trigram do
@moduledoc """
A filter predicate that filters based on trigram similarity.
See the postgres docs on [https://www.postgresql.org/docs/9.6/pgtrgm.html](trigram) for more information.
Requires the pg_trgm extension. Configure which extensions you have installed in your `AshPostgres.Repo`
# Example
filter(query, name: [trigram: [text: "geoff", greater_than: 0.4]])
"""
# alias Ash.Error.Filter.InvalidFilterValue
defstruct [:field, :text, :greater_than, :less_than, :equals]
use Ash.Filter.Predicate
alias Ash.Filter.Predicate
def new(_resource, attribute, opts) do
with :ok <- required_options_provided(opts),
{:ok, value} <- Ash.Type.cast_input(attribute.type, opts[:text]),
{:ok, less_than} <- validate_similarity(opts[:less_than]),
{:ok, greater_than} <- validate_similarity(opts[:greater_than]),
{:ok, equals} <- validate_similarity(opts[:equals]) do
{:ok,
%__MODULE__{
field: attribute.name,
text: value,
greater_than: greater_than,
less_than: less_than,
equals: equals
}}
else
_ ->
{:error, "Invalid filter value"}
end
end
defp validate_similarity(nil), do: {:ok, nil}
defp validate_similarity(1), do: {:ok, 1}
defp validate_similarity(0), do: {:ok, 0}
defp validate_similarity(similarity)
when is_float(similarity) and similarity <= 1.0 and similarity >= 0.0 do
{:ok, similarity}
end
defp validate_similarity(similarity) when is_binary(similarity) do
sanitized =
case similarity do
"." <> decimal_part -> "0." <> decimal_part
other -> other
end
case Float.parse(sanitized) do
{float, ""} -> {:ok, float}
_ -> :error
end
end
defp required_options_provided(opts) do
if Keyword.has_key?(opts, :text) do
case {opts[:greater_than], opts[:less_than], opts[:equals]} do
{nil, nil, nil} -> :error
{nil, nil, _equals} -> :ok
{_greater_than, nil, nil} -> :ok
{nil, _less_than, nil} -> :ok
{_greater_than, _less_than, nil} -> :ok
end
else
:error
end
end
defimpl Inspect do
import Inspect.Algebra
def inspect(
%{field: field, text: text, equals: nil, less_than: nil, greater_than: greater_than},
opts
) do
concat([
"similarity(",
Predicate.add_inspect_path(opts, field),
", ",
to_doc(text, opts),
")",
" > ",
to_doc(greater_than, opts)
])
end
def inspect(
%{field: field, text: text, equals: nil, less_than: less_than, greater_than: nil},
opts
) do
concat([
"similarity(",
Predicate.add_inspect_path(opts, field),
", ",
to_doc(text, opts),
")",
" < ",
to_doc(less_than, opts)
])
end
def inspect(
%{
field: field,
text: text,
equals: nil,
less_than: less_than,
greater_than: greater_than
},
opts
) do
concat([
"similarity(",
Predicate.add_inspect_path(opts, field),
", ",
to_doc(text, opts),
") between ",
to_doc(less_than, opts),
" and ",
to_doc(greater_than, opts)
])
end
def inspect(
%{field: field, text: text, equals: equals, less_than: nil, greater_than: nil},
opts
) do
concat([
Predicate.add_inspect_path(opts, field),
" trigram similarity to ",
to_doc(text, opts),
" == ",
to_doc(equals, opts)
])
end
end
end