add contexts

lib/memex/contexts.ex

@@ -0,0 +1,104 @@
+defmodule Memex.Contexts do
+  @moduledoc """
+  The Contexts context.
+  """
+
+  import Ecto.Query, warn: false
+  alias Memex.Repo
+
+  alias Memex.Contexts.Context
+
+  @doc """
+  Returns the list of contexts.
+
+  ## Examples
+
+      iex> list_contexts()
+      [%Context{}, ...]
+
+  """
+  def list_contexts do
+    Repo.all(Context)
+  end
+
+  @doc """
+  Gets a single context.
+
+  Raises `Ecto.NoResultsError` if the Context does not exist.
+
+  ## Examples
+
+      iex> get_context!(123)
+      %Context{}
+
+      iex> get_context!(456)
+      ** (Ecto.NoResultsError)
+
+  """
+  def get_context!(id), do: Repo.get!(Context, id)
+
+  @doc """
+  Creates a context.
+
+  ## Examples
+
+      iex> create_context(%{field: value})
+      {:ok, %Context{}}
+
+      iex> create_context(%{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def create_context(attrs \\ %{}) do
+    %Context{}
+    |> Context.changeset(attrs)
+    |> Repo.insert()
+  end
+
+  @doc """
+  Updates a context.
+
+  ## Examples
+
+      iex> update_context(context, %{field: new_value})
+      {:ok, %Context{}}
+
+      iex> update_context(context, %{field: bad_value})
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def update_context(%Context{} = context, attrs) do
+    context
+    |> Context.changeset(attrs)
+    |> Repo.update()
+  end
+
+  @doc """
+  Deletes a context.
+
+  ## Examples
+
+      iex> delete_context(context)
+      {:ok, %Context{}}
+
+      iex> delete_context(context)
+      {:error, %Ecto.Changeset{}}
+
+  """
+  def delete_context(%Context{} = context) do
+    Repo.delete(context)
+  end
+
+  @doc """
+  Returns an `%Ecto.Changeset{}` for tracking context changes.
+
+  ## Examples
+
+      iex> change_context(context)
+      %Ecto.Changeset{data: %Context{}}
+
+  """
+  def change_context(%Context{} = context, attrs \\ %{}) do
+    Context.changeset(context, attrs)
+  end
+end

lib/memex/contexts/context.ex

@@ -0,0 +1,22 @@
+defmodule Memex.Contexts.Context do
+  use Ecto.Schema
+  import Ecto.Changeset
+
+  @primary_key {:id, :binary_id, autogenerate: true}
+  @foreign_key_type :binary_id
+  schema "contexts" do
+    field :content, :string
+    field :tag, {:array, :string}
+    field :title, :string
+    field :visibility, Ecto.Enum, values: [:public, :private, :unlisted]
+
+    timestamps()
+  end
+
+  @doc false
+  def changeset(context, attrs) do
+    context
+    |> cast(attrs, [:title, :content, :tag, :visibility])
+    |> validate_required([:title, :content, :tag, :visibility])
+  end
+end