Update db instructions

README.md

@@ -23,7 +23,7 @@ To build and run this app locally:
 - Run the frontend's HTTP server `npm run dev`.
 - Run the database in the background with `docker run -p 5432:5432 --name nashville_zone_lookup_dev -d postgres:9.6`.
 - Create and migrate your database with `mix ecto.setup && mix ecto.migrate`
-- Optionally run the [Postgres shell](https://www.postgresql.org/docs/current/static/app-psql.html) with `docker exec -it nashville_zone_lookup_db psql -U postgres nashville_zone_lookup_dev`
+- Optionally run the [Postgres shell](https://www.postgresql.org/docs/current/static/app-psql.html) with `docker exec -it nashville_zone_lookup_dev psql -U postgres nashville_zone_lookup_db`
 
 _Note: Additional commands are available for the frontend app and are documented in its [README](frontend)._
 
@@ -57,6 +57,9 @@ To test the frontend:
 ## Heroku Deployment
 This repository is configured to deploy master automatically to Heroku via Travis CI.
 
+### Env Variables
+`DATABASE_URL="ecto://postgres:postgres@localhost/nashville_zone_lookup_db"`
+
 ## Planning
 - For a detailed description of the project, check out the [Request for Volunteers](https://docs.google.com/document/d/17DNk0QQyi8SEK4utcMt3zT-Dc6vXzA_zcFwrEENvKJo/edit?usp=sharing).
 - For other shared documents, check out [Google Drive](https://drive.google.com/drive/folders/0Byi0NApRjhBXekRiVFA5MlZ2OTQ?usp=sharing).

config/dev.exs

@@ -52,6 +52,6 @@ config :nashville_zone_lookup, NashvilleZoneLookup.Repo,
   adapter: Ecto.Adapters.Postgres,
   username: "postgres",
   password: "postgres",
-  database: "nashville_zone_lookup_dev",
+  database: "nashville_zone_lookup_db",
   hostname: "localhost",
   pool_size: 10

lib/mix/tasks/nashville_zone_lookup/ingest_land_use_table.ex

@@ -11,6 +11,9 @@ defmodule Mix.Tasks.NashvilleZoneLookup.IngestLandUseTable do
   https://docs.google.com/spreadsheets/d/1O0Qc8nErSbstCiWpbpRQ0tPMS0NukCmcov2-s_u8Umg/
   This spreadsheet has a peculiar format described in detail in the source code
   of this task.
+
+  Assuming the spreadsheet was saved as `data.csv` in the root of this project, the command to
+  injest it is `mix nashville_zone_lookup.ingest_land_use_table ./data.csv`.
   """
 
   use Mix.Task