elixir

问题 After doing some research in the link below https://github.com/elixir-lang/ecto/tree/master/examples/simple I am a little confused about how to use ecto in elixir. There is always a schema declared like defmodule Weather do use Ecto.Model schema "weather" do field :city, :string field :temp_lo, :integer field :temp_hi, :integer field :prcp, :float, default: 0.0 timestamps end end and then in the 'Query' part def sample_query do query = from w in Weather, where: w.prcp > 0.0 or is_nil(w.prcp),

问题 After doing some research in the link below https://github.com/elixir-lang/ecto/tree/master/examples/simple I am a little confused about how to use ecto in elixir. There is always a schema declared like defmodule Weather do use Ecto.Model schema "weather" do field :city, :string field :temp_lo, :integer field :temp_hi, :integer field :prcp, :float, default: 0.0 timestamps end end and then in the 'Query' part def sample_query do query = from w in Weather, where: w.prcp > 0.0 or is_nil(w.prcp),

问题 After doing some research in the link below https://github.com/elixir-lang/ecto/tree/master/examples/simple I am a little confused about how to use ecto in elixir. There is always a schema declared like defmodule Weather do use Ecto.Model schema "weather" do field :city, :string field :temp_lo, :integer field :temp_hi, :integer field :prcp, :float, default: 0.0 timestamps end end and then in the 'Query' part def sample_query do query = from w in Weather, where: w.prcp > 0.0 or is_nil(w.prcp),

问题 After doing some research in the link below https://github.com/elixir-lang/ecto/tree/master/examples/simple I am a little confused about how to use ecto in elixir. There is always a schema declared like defmodule Weather do use Ecto.Model schema "weather" do field :city, :string field :temp_lo, :integer field :temp_hi, :integer field :prcp, :float, default: 0.0 timestamps end end and then in the 'Query' part def sample_query do query = from w in Weather, where: w.prcp > 0.0 or is_nil(w.prcp),

问题 I am new to elixir and phoenix. Now I have trouble with the static assets in phoenix. I want to add a js file in my page, and I add the following code in my template: <script src="<%= static_path(@conn, "/js/test.js") %>"></script> and then create a js file at web/static/js/test.js . However, I got the error about test.js is not found in the browser's console. I notice there is a priv/static/js folder, and I try to create the js file at priv/static/js/test.js . This time, the error gone. I am

问题 How can I change the error message for required fields? If I have something like that @required_fields ~w(name email) and I want to show "no way it's empty" instead of the default value of "can't be blank" ? 回答1: The "can't be blank" error message is hardcoded into Ecto at the moment. However, you can replace this error message by doing: def changeset(model, params \\ :empty) do model |> cast(params, @required_fields, @optional_fields) |> required_error_messages("no way it's empty") end def

问题 How can I change the error message for required fields? If I have something like that @required_fields ~w(name email) and I want to show "no way it's empty" instead of the default value of "can't be blank" ? 回答1: The "can't be blank" error message is hardcoded into Ecto at the moment. However, you can replace this error message by doing: def changeset(model, params \\ :empty) do model |> cast(params, @required_fields, @optional_fields) |> required_error_messages("no way it's empty") end def

问题 I try to generate a signature using Elixir, which has a same value as PHP does. For example the code in PHP is $signature = base64_encode(hash_hmac("sha256", "abc", "def")); and the output will be Mzk3ZjQ2NzM0MWU0ZDc4YzQ3NDg2N2VmMzI2MWNkYjQ2YzBlMTAzNTFlOWE5ODk5NjNlNmNiMmRjZTQwZWU1ZA== How should I generate the signature that has the same value in Elixir. I tried something like below iex(9)> :crypto.hmac(:sha256, "abc", "def") |> Base.encode64 │ "IOvA8JNERwE081BA9j6pix2OQUISlJ7lxQBCnRXqsIE="

问题 I'm very new in the world of Elixir and Phoenix Framework. I'm trying to follow TheFireHoseProject tutorial, but having problems with querying raw SQL with Ecto. The tutorial says this should work: defmodule Queries do def random do query = Ecto.Adapters.Postgres.query( Repo, "SELECT id, saying, author from quotes ORDER BY RANDOM() LIMIT 1", []) %Postgrex.Result{rows: [row]} = query {id, saying, author} = row %Splurty.Quote{id: id, saying: saying, author: author} end end I'm getting a runtime

问题 I'm very new in the world of Elixir and Phoenix Framework. I'm trying to follow TheFireHoseProject tutorial, but having problems with querying raw SQL with Ecto. The tutorial says this should work: defmodule Queries do def random do query = Ecto.Adapters.Postgres.query( Repo, "SELECT id, saying, author from quotes ORDER BY RANDOM() LIMIT 1", []) %Postgrex.Result{rows: [row]} = query {id, saying, author} = row %Splurty.Quote{id: id, saying: saying, author: author} end end I'm getting a runtime